阅读说明：本技术 一种水质总钴在线监测装置及监测方法 (Water quality total cobalt online monitoring device and monitoring method ) 是由 冯中宝 徐生龙 赵峰 李军 孙学还 于 2018-06-26 设计创作，主要内容包括：本发明涉及一种水质总钴在线监测装置及监测方法。装置包括进样单元、消解单元、分析单元和控制单元,控制单元分别与进样单元、消解单元、分析单元相连；进样单元包括蠕动泵、液体检测器管、上三通计量阀、计量长管、计量短管、下三通计量阀和十通阀,液体检测器管分别与蠕动泵和上三通计量阀相连,计量长管、计量短管分别与上三通计量阀、下三通计量阀相连；消解单元包括消解比色设备和消解比色池,消解比色设备分别与十通阀、消解比色池相连,消解比色池的外壳安装有光源和光电二极管；分析单元包括两个光检测-发光接收设备,分别与消解比色设备相连；控制单元包括PLC控制模块。本发明测试结果精确。(The invention relates to a water quality total cobalt online monitoring device and a monitoring method. The device comprises a sample introduction unit, a digestion unit, an analysis unit and a control unit, wherein the control unit is respectively connected with the sample introduction unit, the digestion unit and the analysis unit; the sample injection unit comprises a peristaltic pump, a liquid detector pipe, an upper three-way metering valve, a metering long pipe, a metering short pipe, a lower three-way metering valve and a ten-way valve, wherein the liquid detector pipe is respectively connected with the peristaltic pump and the upper three-way metering valve, and the metering long pipe and the metering short pipe are respectively connected with the upper three-way metering valve and the lower three-way metering valve; the digestion unit comprises a digestion colorimetric device and a digestion colorimetric pool, the digestion colorimetric device is respectively connected with the ten-way valve and the digestion colorimetric pool, and a light source and a photodiode are arranged on a shell of the digestion colorimetric pool; the analysis unit comprises two light detection-luminescence receiving devices which are respectively connected with the digestion colorimetric device; the control unit comprises a PLC control module. The invention has accurate test result.)

1. The device for monitoring the total cobalt in the water quality on line is characterized by comprising a sample introduction unit, a digestion unit, an analysis unit and a control unit, wherein the control unit is respectively connected with the sample introduction unit, the digestion unit and the analysis unit;

the sample injection unit comprises a peristaltic pump, a liquid detector pipe, an upper three-way metering valve, a metering long pipe, a metering short pipe, a lower three-way metering valve and a ten-way valve, wherein the liquid detector pipe is respectively connected with the peristaltic pump and the upper three-way metering valve, the metering long pipe is respectively connected with the upper three-way metering valve and the lower three-way metering valve, the metering short pipe is respectively connected with the upper three-way metering valve and the lower three-way metering valve, and the ten-way valve is connected with the lower three-way metering valve;

the digestion unit comprises a digestion colorimetric device and a digestion colorimetric pool, the digestion colorimetric device is respectively connected with the ten-way valve and the digestion colorimetric pool, and a light source and a photodiode are arranged on a shell of the digestion colorimetric pool;

the analysis unit comprises two light detection-luminescence receiving devices which are respectively connected with the digestion colorimetric device;

the control unit comprises a PLC control module.

2. The device for on-line monitoring of total cobalt in water quality as claimed in claim 1, further comprising a sample storage unit, wherein the sample storage unit comprises a water sample box and a standard sample box, and the water sample box and the standard sample box are respectively connected with the ten-way valve.

3. The online water quality total cobalt monitoring device as claimed in claim 2, wherein the sample storage unit further comprises a reagent kit, and the reagent kit is connected with the ten-way valve.

4. The online monitoring device for total cobalt in water quality as claimed in claim 1, further comprising a waste liquid storage unit, wherein the waste liquid storage unit is connected with the ten-way valve.

5. The device for on-line monitoring of total cobalt in water quality as claimed in claim 1, wherein the liquid detector tube is connected with the upper three-way metering valve through an upper and lower liquid leakage tube, and the upper and lower liquid leakage tube is a hard polytetrafluoroethylene tube.

6. A water quality total cobalt online monitoring method is characterized by comprising the following steps:

liquid taking: the control unit controls the peristaltic pump to rotate anticlockwise, generates negative pressure to suck liquid to be detected, and sends the liquid to be detected into the liquid detector tube; when the liquid amount to be measured is more than 5ml, feeding the liquid to be measured into the long metering pipe through the upper three-way metering valve for metering, and discharging liquid by using the short metering pipe; when the volume of the liquid to be measured is less than or equal to 5ml, the liquid to be measured is sent into the short measuring pipe for measuring, and the long measuring pipe is used for discharging liquid; after metering and liquid discharging, sending the liquid to be measured into a ten-way valve;

digestion: sending the liquid to be detected into a digestion colorimetric pool through the ten-way valve, then sending acetic acid-potassium acetate with 5mLPH value of 5.5, 5mL of sodium pyrophosphate with concentration of 0.5% and 10mL of hydrochloric acid with concentration of 50% into the digestion colorimetric pool in sequence through the ten-way valve, and digesting for 10 minutes under the action of digestion colorimetric equipment;

monitoring: and cooling the digested solution to be detected to room temperature, sending 5mL of 5-CL-PADAB solution with the concentration of 0.01% into the digestion colorimetric pool through the ten-way valve, carrying out color comparison under the action of the light detection-light emitting receiving equipment to obtain detection data, and carrying out contrastive analysis on the detection data and a standard sample to obtain a monitoring result.

7. The method as claimed in claim 6, wherein the control unit sends the liquid to be tested in the sampling step into a water sample box of the sample storage unit through the ten-way valve, and when the liquid to be tested in the water sample box is sucked into the liquid detector tube, the peristaltic pump rotates clockwise and generates negative pressure; when the amount of the liquid to be measured is more than 5ml, the liquid to be measured is sent into the long measuring pipe through the upper three-way metering valve for metering, and the short measuring pipe is used for discharging liquid; when the volume of the liquid to be measured is less than or equal to 5ml, the liquid to be measured is sent into the short measuring pipe for measuring, and the long measuring pipe is used for discharging liquid; and after metering and liquid discharging, sending the liquid to be measured into the digestion colorimetric pool through the ten-way valve.

8. The method as claimed in claim 6, wherein the photodetection-luminescence receiving device performs detection by spectrophotometry with a double-optical path reverse reflection path.

Technical Field

The invention belongs to the technical field of water quality detection, and particularly relates to a water quality total cobalt online monitoring device and a monitoring method.

Background

Cobalt pollution refers to the pollution of cobalt to the environment. Cobalt has been used as a foaming agent for beer and people drinking large amounts of beer can cause cobalt poisoning events. People become poisoned whenever they take more than 500 mg of cobalt. The concentration of cobalt in the soil solution is 10 mg/l, which can kill the crops.

Cobalt formulations are often injected or exposed to excessive amounts of the original cobalt environment, which can cause cobalt poisoning. Children are sensitive to cobalt toxicity and doses exceeding 1mg per kg body weight should be avoided. Toxicity increases in the absence of vitamin B12 and protein and in the consumption of alcohol, which is common in alcoholics.

Cobalt dust can cause "hard metal disease" (hard metal disease), manifested by allergic asthma, dyspnea, dry cough, occasional chemical pneumonia (interstitial pneumonia), pulmonary edema, and CoO can also cause asthma.

Cobalt often exists in natural water in the form of hydrated cobalt oxide, cobalt carbonate, or precipitates on the bottom of water, or is adsorbed by a substrate and is rarely dissolved in water. The average content of cobalt in the fresh water was 0.2. mu.g/l. In the form of hydrated complex ions of cobalt or other complex ions in acidic solution, [ Co (OH) in alkaline solution₄]^2-Gradually increasing the solubility. Cobalt and a ligand in natural water often generate bivalent complex ions, but when the cobalt and a ligand compound containing ammonia, ammonium, nitro and the like generate the complex ions, the cobalt is firstly oxidized by molecular oxygen to generate trivalent complex ions. The average content of cobalt in seawater is only 0.02 microgram/liter, and the dissolved cobalt is mainly Co²⁺And CoCO₃The state of (2) exists. As can be seen from the ratio of the cobalt concentration of the fresh water to the seawater, there is a moderate enrichment of cobalt in the sediment near the estuary. Cobalt is more toxic to fish and aquatic animals than to warm-blooded animals. The critical concentration of the toxic effect of the cobalt is 0.5 mg/L, and the cobalt concentration reaches 10 mg/L, so that crucian and silkworms can die.

At present, the domestic cobalt monitoring is manual monitoring, the monitoring workload is large, the operation is frequent, if the monitoring process is improper, the health of operators can be affected, and data cannot be obtained in real time.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide an online monitoring device and a monitoring method for total cobalt in water quality, so as to realize automatic monitoring of the total cobalt in water quality.

The invention provides a device for monitoring total cobalt in water on line, which comprises a sample introduction unit, a digestion unit, an analysis unit and a control unit, wherein the control unit is respectively connected with the sample introduction unit, the digestion unit and the analysis unit;

the sample injection unit comprises a peristaltic pump, a liquid detector pipe, an upper three-way metering valve, a metering long pipe, a metering short pipe, a lower three-way metering valve and a ten-way valve, wherein the liquid detector pipe is respectively connected with the peristaltic pump and the upper three-way metering valve, the metering long pipe is respectively connected with the upper three-way metering valve and the lower three-way metering valve, the metering short pipe is respectively connected with the upper three-way metering valve and the lower three-way metering valve, and the ten-way valve is connected with the lower three-way metering valve;

the digestion unit comprises a digestion colorimetric device and a digestion colorimetric pool, the digestion colorimetric device is respectively connected with the ten-way valve and the digestion colorimetric pool, and a light source and a photodiode are arranged on a shell of the digestion colorimetric pool;

the analysis unit comprises two light detection-luminescence receiving devices which are respectively connected with the digestion colorimetric device;

the control unit comprises a PLC control module.

In some embodiments of the present invention, the apparatus further comprises a sample storage unit, wherein the sample storage unit comprises a water sample box and a standard sample box, and the water sample box and the standard sample box are respectively connected with the ten-way valve.

In some embodiments of the present invention, the sample storage unit further comprises a reagent cartridge, and the reagent cartridge is connected to the ten-way valve.

In some embodiments of the invention, the system further comprises a waste liquid storage unit, and the waste liquid storage unit is connected with the ten-way valve.

In some embodiments of the invention, the liquid detector tube and the upper three-way metering valve are connected by upper and lower liquid leakage tubes, which are rigid polytetrafluoroethylene tubes.

The invention provides a method for monitoring total cobalt in water on line, which comprises the following steps:

liquid taking: the control unit controls the peristaltic pump to rotate anticlockwise, generates negative pressure to suck liquid to be detected, and sends the liquid to be detected into the liquid detector tube; when the liquid amount to be measured is more than 5ml, feeding the liquid to be measured into the long metering pipe through the upper three-way metering valve for metering, and discharging liquid by using the short metering pipe; when the volume of the liquid to be measured is less than or equal to 5ml, the liquid to be measured is sent into the short measuring pipe for measuring, and the long measuring pipe is used for discharging liquid; after metering and liquid discharging, sending the liquid to be measured into a ten-way valve;

digestion: sending the liquid to be detected into a digestion colorimetric pool through the ten-way valve, then sending acetic acid-potassium acetate with 5mLPH value of 5.5, 5ml of sodium pyrophosphate with concentration of 0.5% and 10ml of hydrochloric acid with concentration of 50% into the digestion colorimetric pool in sequence through the ten-way valve, and digesting for 10 minutes under the action of digestion colorimetric equipment;

monitoring: and cooling the digested solution to be detected to room temperature, sending 5mL of 5-CL-PADAB solution with the concentration of 0.01% into the digestion colorimetric pool through the ten-way valve, carrying out color comparison under the action of the light detection-light emitting receiving equipment to obtain detection data, and carrying out contrastive analysis on the detection data and a standard sample to obtain a monitoring result.

In some embodiments of the present invention, the control unit sends the liquid to be tested in the sampling step into a water sample box of the sample storage unit through the ten-way valve, when the liquid to be tested is resolved, the peristaltic pump rotates clockwise to generate negative pressure, and the liquid to be tested in the water sample box is pumped into the liquid detector tube; when the amount of the liquid to be measured is more than 5ml, the liquid to be measured is sent into the long measuring pipe through the upper three-way metering valve for metering, and the short measuring pipe is used for discharging liquid; when the volume of the liquid to be measured is less than or equal to 5ml, the liquid to be measured is sent into the short measuring pipe for measuring, and the long measuring pipe is used for discharging liquid; and after metering and liquid discharging, sending the liquid to be measured into the digestion colorimetric pool through the ten-way valve.

In some embodiments of the present invention, the photodetection-luminescence receiving device employs a two-optical path retro-reflection spectrophotometric method for detection.

The system is stable, the liquid taking precision is high, and the test result is accurate.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is a schematic structural diagram of a total cobalt in water quality on-line monitoring device in an embodiment of the invention.

FIG. 2 is a schematic structural diagram of a sample injection unit, a digestion unit and an analysis unit which are preferred in the embodiment of the invention.

Detailed Description

The following detailed description of the present invention, taken in conjunction with the accompanying drawings and examples, is provided to enable the invention and its various aspects and advantages to be better understood. However, the specific embodiments and examples described below are for illustrative purposes only and are not limiting of the invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

In the description of the present specification, the concentration% refers to mass percentage concentration unless otherwise specified.

Fig. 1 shows a preferred water quality total cobalt online monitoring device of the invention, which comprises: the device comprises a sample introduction unit, a digestion unit, an analysis unit, a control unit, a sample storage unit and a waste liquid storage unit. In FIG. 1, solid arrows indicate the flow of the reagent or sample, and dashed arrows indicate the flow of the electric signal. As shown in figure 1, the control unit is respectively connected with the sample introduction unit, the digestion unit and the analysis unit, the sample introduction unit is respectively connected with the digestion unit and the sample storage unit, and the analysis unit is respectively connected with the digestion unit and the waste liquid storage unit.

The sample storage means and the waste liquid storage means are not essential to the apparatus of the present invention, and may be increased or decreased depending on the actual situation.

As shown in fig. 2, the sample injection unit includes a peristaltic pump 101, a liquid detector tube 102, a liquid detector mounting seat 103, an upper and lower liquid leakage tube 104, an upper three-way metering valve 105, a lower three-way metering valve 106, a metering long tube 107, a metering short tube 108, and a ten-way valve 109. The liquid detector tube 103 is respectively connected with the peristaltic pump 101, the liquid detector mounting seat 102 and the upper three-way metering valve 105 (in fig. 2, the liquid detector tube 103 is connected with the upper three-way metering valve 105 through the upper and lower liquid flow exposure tubes 104, and other liquid flow tubes can be used for connection of course), the long metering tube 107 is respectively connected with the upper three-way metering valve 105 and the lower three-way metering valve 106, the short metering tube 108 is respectively connected with the upper three-way metering valve 105 and the lower three-way metering valve 106, and the ten-way valve 109 is connected with the lower three-way.

When liquid to be measured enters the liquid detector tube 102, the liquid detector arranged on the wall of the liquid detector tube 102 transmits a signal to the PLC control module, responds to the arrival of the liquid level of the PLC, discharges the liquid between the upper three-way metering valve 105 and the liquid detector tube 102, and intercepts the liquid between the upper three-way metering valve 105 and the lower three-way metering valve 106 as liquid inlet amount.

The sample introduction unit of the invention ensures the precision of liquid taking and improves the stability of the system, and the unit adopts the volume of the hard tube between the two three-way metering valves as one metering unit, thereby improving the precision by 5 times compared with the traditional photoelectric metering system.

The digestion unit shown in fig. 2 is a preferred digestion unit of the present invention, and comprises a digestion colorimetric device 201 and a digestion colorimetric pool 202, wherein the digestion colorimetric device 201 is connected with the ten-way valve 109 and the digestion colorimetric pool 202 respectively. Wherein, the digestion colorimetric device 201 comprises a lower electromagnetic valve 2011 and an upper electromagnetic valve 2012, and the shell of the digestion colorimetric pool 202 is provided with a light source and a photodiode.

In the testing process, in order to ensure the testing effect, after a reagent is added, high-temperature high-pressure digestion is needed, because the high-temperature high-pressure digestion needs to ensure the safety of a digestion system in the digestion process, and if the pressure is too high or the temperature is too high, the explosion of the digestion system can be caused.

In a preferred embodiment of the present invention, the digestion colorimetric device 201 comprises a collar, a pipe connector, a lower electromagnetic valve 2011 with high temperature, high pressure and corrosion resistance, a lower polytetrafluoroethylene pipeline, a lower colorimetric pool mounting block, a colorimetric pool mounting seat, a temperature collector, a colorimetric pool pressing block, a compression spring, a compression screw, an upper polytetrafluoroethylene pipeline and an upper electromagnetic valve 2012 with corrosion resistance and common pressure resistance, wherein the lower electromagnetic valve 2011 and the upper electromagnetic valve 2012 are respectively connected with the digestion colorimetric pool 202 through the lower polytetrafluoroethylene pipeline and the upper polytetrafluoroethylene pipeline, two pipe ends of the lower polytetrafluoroethylene pipeline are respectively fixed on the lower electromagnetic valve 2011 and the lower end of the digestion colorimetric pool 202 through pipe connectors, two pipe ends of the upper polytetrafluoroethylene pipeline are respectively fixed on the upper end of the digestion colorimetric pool 202 and the upper electromagnetic valve 2012 through pipe connectors, the pipe connectors are respectively mounted on the pipes connected with the lower polytetrafluoroethylene pipeline and the upper polytetrafluoroethylene pipeline, the digestion colorimetric pool 202 is fixed on the colorimetric pool mounting seat through the lower colorimetric pool mounting block, clear up the upper end of colorimetric pool 202 and be provided with colorimetric pool compact piece, colorimetric pool compact piece cooperatees with housing spring and housing screw, clears up and installs temperature collector on the colorimetric pool 202.

The upper port and the lower port of the digestion colorimetric pool 202 are of flat sealing port structures so as to avoid air leakage, water leakage and acid leakage, the upper port and the lower port are respectively provided with an upper O-shaped ring and a lower O-shaped ring, and the upper O-shaped ring and the lower O-shaped ring are all fluororubber rings, so that the digestion colorimetric pool can effectively operate for a long time under a high-temperature and high-pressure environment.

The digestion colorimetric pool 202 is preferably made of quartz glass, has strong light transmission, can realize the light passing of 190nm-1000nm, has the characteristics of repeated heating, high temperature, high pressure, corrosion resistance and the like, and is acid and alkali resistant; the semicircular rings with a plurality of spherical protrusions are welded on the digestion colorimetric pool 202 and are also made of quartz glass, and heating wires are wound on the semicircular rings so that the heating wires can be better attached to the digestion colorimetric device 201.

Clear up under the colorimetric pool installation piece, colorimetric pool compact piece and all adopt polytetrafluoroethylene to make to the security and the suitability of assurance system.

In addition, the colorimetric pool mounting seat adopts an integrated structure, so that the mounting time is greatly saved, the mounting steps are simplified, and the deviation caused by the assembly of different modules is reduced.

This preferred embodiment has quadruple safety protection functions: the first layer of protection is a temperature collector, the temperature collector adopts a Pt100 temperature collector, the temperature collector is connected with a PLC (programmable logic controller) collection module, the PLC realizes heating through PID (proportion integration differentiation) temperature control, and once the system is heated for a certain time, the system can automatically alarm in the heating and digestion process.

The protection of second floor is pressure spring, and pressure spring is high strength stainless steel spring, and this spring and housing screw cooperation will realize the fine cooperation of pressure and colorimetric pool to reach safety protection's purpose, when housing screw screwed to the bottom, pressure according to hooke's law and the pressure of pressure spring that calculates is less than colorimetric pool temperature and is higher than 180 ℃ pressure, if digest the heating temperature in colorimetric pool 202 and exceed 180 ℃, pressure spring can open the pressure release automatically promptly.

The third layer protects an upper electromagnetic valve 2012 which is resistant to corrosion and ordinary pressure, the electromagnetic valve is customized according to requirements, namely when the temperature of the digestion colorimetric pool 202 exceeds 178 ℃, the upper electromagnetic valve 2012 is automatically pushed open by air pressure, and therefore the purpose of automatic pressure relief is achieved.

The protection of fourth layer is the clamp, and when the temperature of digesting colorimetric pool 202 exceeded 200 ℃, entire system's pressure was conducted the pipeline, then thrust is higher than the biggest clamping force of clamp design, and the pipeline drops release pressure automatically to guarantee that the system can not appear exploding.

Through quadruple protection, the system is ensured to not explode even if a fault occurs in the process of digestion, and the system can automatically detect and shut down the digestion unit.

The digestion unit of the present invention may have other structures, as long as the object of the present invention can be achieved, and the description of the other structures is omitted.

As shown in FIG. 2, the analytical unit of the present invention comprises two light detection-luminescence receiving devices 301 each connected to the digestion colorimetric device 201.

In a preferred embodiment of the present invention, each of the light detection-light emission receiving devices 301 comprises a distal optical fiber mounting end, an optical fiber and a proximal optical fiber mounting end, wherein the optical fiber connects the distal optical fiber mounting end and the proximal optical fiber mounting end, respectively, and the proximal optical fiber mounting end is connected to the digestion colorimetric device 201.

In the preferred embodiment of the present invention, the optical fiber is a flexible polymer optical fiber with high light transmittance.

The analysis unit of the present invention may have other structures as long as the object of the present invention can be achieved, and the description of the other structures is omitted.

The analysis unit of the invention has small test error, ensures the precision and accuracy of measurement, and has good safety, stability and reliability.

As shown in fig. 2, the preferred embodiment of the present invention further includes a sample storage unit, which includes an aqueous sample box 401 and a standard sample box 402, and the aqueous sample box 401 and the standard sample box 402 are respectively connected to the ten-way valve 109.

As shown in fig. 2, the sample storage unit may further include a kit, and the kit shown in fig. 2 includes a potassium acetate cassette 4031, a sodium pyrophosphate cassette 4032, a hydrochloric acid cassette 4033, and a 5-CL-PADAB (5-chloro-2- (pyridylazo) -1, 3-diaminobenzene)) solution cassette 4034, and the potassium acetate cassette 4031, the sodium pyrophosphate cassette 4032, the hydrochloric acid cassette 4033, and the 5-CL-PADAB solution cassette 4034 are respectively connected to the ten-way valve 109.

As shown in fig. 2, the preferred embodiment of the present invention further includes a waste liquid storage unit 5, and the waste liquid storage unit 5 is connected to the ten-way valve 109.

In a preferred embodiment of the present invention, the upper and lower liquid weep tubes 104 are rigid polytetrafluoroethylene tubes.

The control unit comprises a PLC control module, and the operation of the whole water quality total cobalt online monitoring device is controlled by the PLC control module. The control unit has the functions of data acquisition, processing, display and storage, safety management, data and operation log query output, local communication, remote communication and the like, and also has the functions of output sample reservation, sample excitation and the like.

The sample introduction unit covers a liquid detection system, liquid is collected by the sample introduction unit, the liquid detection system judges that the liquid reaches a specified dosage, a peristaltic pump of the sample introduction unit back blows the liquid into a colorimetric pool of a digestion system, after digestion, a light source of an analysis unit sends light waves with specific wavelengths to penetrate through the colorimetric pool, a photodiode opposite to the light source receives light energy which is not absorbed by the colorimetric pool, signal measurement of the analysis unit is completed, and signals are transmitted to a control collection system of a control unit.

The device of the invention is based on the national standard (HJ 550-. The microcomputer control technology is adopted to combine chemistry, light, mechanical and electrical, and complete automatic detection is achieved while strictly following the conditions and steps in the standard.

The invention provides a method for monitoring total cobalt in water on line, which comprises the following steps:

liquid taking: the control unit controls the peristaltic pump 101 to rotate anticlockwise, generates negative pressure to suck liquid to be detected, and sends the liquid to be detected into the liquid detector tube 102; when the volume of the liquid to be measured is more than 5ml, the liquid to be measured is sent into a long measuring pipe 107 through an upper three-way metering valve 105 for metering, and liquid is discharged through a short measuring pipe 108; when the volume of the liquid to be measured is less than or equal to 5ml, the liquid to be measured is sent into a measuring short pipe 108 for measuring, and the liquid is discharged by a measuring long pipe 107; after metering and draining, the liquid to be measured is sent to the ten-way valve 109.

Digestion: sending the liquid to be detected into the digestion colorimetric pool 202 through the ten-way valve 109, then sending the acetic acid-potassium acetate with 5mlPH value of 5.5, 5mL of sodium pyrophosphate with concentration of 0.5% and 10mL of hydrochloric acid with concentration of 50% into the digestion colorimetric pool 202 in sequence through the ten-way valve 109, and digesting for 10 minutes under the action of the digestion colorimetric device 201.

Monitoring: and cooling the digested solution to be detected to room temperature, sending 5mL of 5-CL-PADAB solution with the concentration of 0.01% into the digestion colorimetric pool 202 through the ten-way valve 109, carrying out color comparison under the action of the light detection-light emission receiving equipment 301 to obtain detection data, and carrying out comparative analysis on the detection data and a standard sample to obtain a monitoring result.

In the preferred embodiment of the present invention, the control unit sends the liquid to be tested in the sampling step into the water sample box 401 of the sample storage unit through the ten-way valve 109, when the digestion is performed, the peristaltic pump 101 rotates clockwise to generate negative pressure, and the liquid to be tested in the water sample box 401 is pumped into the liquid detector tube 102; when the volume of the liquid to be measured is more than 5ml, the liquid to be measured is sent into a long measuring pipe 107 through an upper three-way metering valve 105 for metering, and liquid is discharged through a short measuring pipe 108; when the volume of the liquid to be measured is less than or equal to 5ml, the liquid to be measured is sent into a measuring short pipe 108 for measuring, and the liquid is discharged by a measuring long pipe 107; after metering and draining, the liquid to be measured is sent into the digestion colorimetric pool 202 through the ten-way valve 109.

In the preferred embodiment of the present invention, the photodetection-luminescence receiving device 301 performs detection by a two-optical path reverse reflection spectrophotometry. Its main theory of operation, two kinds of receipts of a bunch of light, when the test, decide according to the concentration, when the test low-range, equipment detects the low concentration that targets in place, the control unit signals, the steering wheel starts, then clear up the carousel rotation 90 that colorimetric pool 202 is opposite, selenium photocell turns to one side, reflection of light system is for changeing up, then light is reflected on the selenium photocell of opposite lower limit by reflection of light system, selenium photocell is according to the received photon volume, convey the control unit to the signal through photoelectric conversion, the control unit is according to the Blanco principle, calculate the concentration. If be high concentration, then behind a bundle of light passing through the color comparison pond, the steering wheel of transmission was not rotated, and opposite selenium photocell receives photoelectric signal, and is the same with above-mentioned step, converts light signal into concentration signal. When detecting low concentration, it is a double optical path, because the concentration is related to the intensity and optical path of the detection light according to the brownian ratio formula, the optical path is increased, that is, the sensitivity of the instrument is increased, so it can be more accurate when testing low concentration.

The present invention will be described below with reference to specific examples. The values of the process conditions taken in the following examples are exemplary and ranges of values are provided as indicated in the foregoing summary, and reference may be made to conventional techniques for process parameters not specifically noted. The detection methods used in the following examples are all conventional in the industry.