阅读说明：本技术 一种高精度全自动滴定装置 (High-precision full-automatic titration device ) 是由 叶男 廖柯熹 何国玺 覃敏 赵帅 邹庆 王雨薇 王亮 王敏安 廖德琛 于 2020-11-25 设计创作，主要内容包括：本发明公开了一种高精度全自动滴定装置,包括滴定操作平台组件、滴定计量组件、滴定控制组件3个部分。所述滴定操作平台组件包括滴定箱组装在磁力搅拌台上,便于拆卸；滴定箱设有可开关门；滴定箱左右两侧内部设有卡槽,颜色传感器的支架卡入卡槽；滴定箱上方设有一开孔；滴定瓶放置在磁力搅拌托盘上。滴定计量组件包括标准液容器；精密流量计下端连接吸液管,上端连接移液管；吸液管中部设有遮盖,遮盖置于标准液容器开口处对容器进行密封；移液管末端连接滴定针头；移液管和滴定针头连接处设置遮盖,置于滴定瓶开口处。滴定控制组件包括装在支架上的颜色传感器,其反馈的信息由计算机接收；吸液管上的自动阀门,自动阀门的开关由计算机控制。(The invention discloses a high-precision full-automatic titration device which comprises 3 parts of a titration operation platform assembly, a titration metering assembly and a titration control assembly. The titration operation platform assembly comprises a titration box which is assembled on the magnetic stirring table and is convenient to disassemble; the titration box is provided with an openable door; clamping grooves are formed in the left side and the right side of the titration box, and the bracket of the color sensor is clamped into the clamping grooves; an opening is arranged above the titration box; the titration flask was placed on a magnetic stirring tray. The titration metering assembly comprises a standard liquid container; the lower end of the precision flowmeter is connected with a pipette, and the upper end of the precision flowmeter is connected with a pipette; a cover is arranged in the middle of the pipette and is placed at the opening of the standard liquid container to seal the container; the end of the pipette is connected with a titration needle; the connection part of the pipette and the titration needle is covered and is arranged at the opening of the titration flask. The titration control component comprises a color sensor arranged on the bracket, and the feedback information of the color sensor is received by the computer; and an automatic valve on the pipette, wherein the opening and closing of the automatic valve are controlled by a computer.)

1. The utility model provides a full automatic titration outfit of high accuracy which characterized in that includes:

3 parts of a titration operation platform component, a titration metering component and a titration control component;

the titration operation platform assembly comprises a titration box (3) assembled on a magnetic stirring table (11); the titration box (3) is provided with an openable door (1); clamping grooves (2) (20) are formed in the left side and the right side of the interior of the titration box (3), and brackets (5) (21) for fixing the color sensors (6) (22) are clamped in the clamping grooves (2) (20); an opening (4) is arranged above the titration box (3); the titration flask (9) is placed on a magnetic stirring tray (10);

the titration metering component comprises a precision flowmeter (13), the lower end of the precision flowmeter is connected with a pipette (14), and the upper end of the precision flowmeter is connected with a pipette (12); the pipette (14) extends into the standard liquid container (16); a sealing cover (15) is arranged in the middle of the liquid suction pipe (14), and the sealing cover (15) is arranged at an opening of the standard liquid container (16); the end of the pipette (12) is connected with a titration needle head (8); a sealing cover (7) is arranged at the joint of the pipette (12) and the titration needle (8) and is arranged at the opening of the titration bottle (9); the standard liquid container (16) is arranged on the object placing table (19);

the titration control assembly comprises a color sensor (6) (22), and the feedback information of the color sensor is received by a computer (18); an automatic valve (17) on the pipette (14), wherein the opening and closing of the automatic valve (17) are controlled by a computer (18); the flow rate of the precise flowmeter (13) is adjusted and controlled by a computer (18).

2. The high-precision full-automatic titration device according to claim 1, wherein: the color sensors (6) and (22), the precision flowmeter (13), the automatic valve (17) and the computer (18) form an automatic control system for precisely controlling the titration speed and the titration start and stop.

3. The high-precision full-automatic titration device according to claim 1, wherein: the standard solution container (16) is placed on a placing table (19) which is higher than an operation plane, the standard solution does not need power self-flow, and the titration speed is accurately measured and controlled through a precision flowmeter (13).

4. The high-precision full-automatic titration device according to claim 1, wherein: the color sensors (6) and (22) can move on the clamping grooves (2) and (20) through the supports (5) and (21) and change positions by adopting a nested structure to freely stretch and retract, and a proper observation position is found.

Technical Field

The invention relates to the technical field of chemical experiment devices, in particular to a high-precision full-automatic titration device.

Background

Titration is a commonly used solution detection method in the chemical field, and the principle is that a standard solution with known concentration is added into a solution to be detected drop by drop, the titration end point is judged through color change, and then the ion content in the solution to be detected is calculated according to the volume of the standard solution consumed when the titration end point is reached.

The conventional manual titration operation needs manual adjustment of titration speed, manual filling of standard solution, manual judgment of solution color change and manual reading. If the titration speed is too fast, the titration is easy to pass through the end point, and if the titration speed is too slow, the operation time is very long; when the number of ions to be detected in a detected water sample is large, the operation needs to be stopped after the solution in the burette is used up, and the titration standard solution is added, so that the operation time is prolonged, the reading times are increased, and the error is increased; the judgment standard of each person for the color is different, and the ion concentration of the same water sample measured by different persons is different; manual readings are not accurate enough and errors exist. In addition, artifical titration usually can be diluted by the survey water sample, when being surveyed the ion content in the survey water sample when being few, can appear dripping into a drop of standard solution and just dripped the phenomenon, not only reading error is very big this moment, and it is difficult to return to drip too much moreover, can't compensate.

This device uses color sensor, judges through the change that detects the colour and titrates the terminal point, can solve because artifical reading and artifical error that judges to titrate the terminal point and bring. In addition, the device uses a precise flowmeter to measure the volume of the consumed standard solution, and can eliminate errors caused by manual reading. The device can realize full-automatic titration and reduce manual labor.

Disclosure of Invention

In view of the above problems, the present invention aims to provide a high-precision full-automatic titration apparatus, which can improve the measurement precision and efficiency.

In order to achieve the purpose, the invention provides the following technical scheme: the high-precision full-automatic titration device comprises a titration operation platform assembly, a titration metering assembly and a titration control assembly. The titration operation platform provides a titration operation space, and the titration box 3 is assembled on the magnetic stirring table 11; the titration box 3 is provided with an openable door 1; the left side and the right side in the titration box 3 are provided with clamping grooves 2 and 20, and brackets 5 and 21 for fixing the color sensors 6 and 22 are clamped in the clamping grooves 2 and 20; an opening 4 is arranged above the titration box 3; the titration flask 9 is placed on a magnetic stirring tray 10;

the titration metering component accurately meters the volume of the consumed standard solution and comprises a precision flowmeter 13, wherein the lower end of the precision flowmeter is connected with a pipette 14, and the upper end of the precision flowmeter is connected with a pipette 12; the pipette 14 extends into the standard liquid container 16; a sealing cover 15 is arranged in the middle of the pipette 14, and the sealing cover 15 is arranged at an opening of a standard liquid container 16; the end of the pipette 12 is connected with the titration needle 8; a sealing cover 7 is arranged at the joint of the pipette 12 and the titration needle 8 and is arranged at the opening of the titration bottle 9; the standard solution container 16 is placed on the placing table 19;

the titration control assembly includes a color sensor 6, 22, the information of which is received by the computer 18; an automatic valve 17 on the pipette 14, the opening and closing of the automatic valve 17 being controlled by a computer 18; the precise flowmeter 13 adjusts the flow rate and is controlled by the computer 18.

Further, the color sensors 6 and 22, the precision flowmeter 13, the automatic valve 17 and the computer 18 form an automatic control system for precisely controlling the titration speed and the titration start and stop.

Further, the standard solution container 16 is placed on a placing table 19 which is higher than the operation plane, the standard solution does not have power self-flow, and the titration speed is accurately measured and controlled through the precision flowmeter 13.

Further, the color sensors 6 and 22 can move on the card slots 2 and 20 through the supports 5 and 21 and can be freely adjusted in a telescopic mode through a nested structure to change positions, and a proper observation position can be found.

Drawings

FIG. 1 is a schematic structural diagram of a high-precision full-automatic titration apparatus.

FIG. 2 is a structural diagram of a bracket for fixing a color sensor of a high-precision full-automatic titration device.

FIG. 3 is a schematic diagram of an automatic control system of a high-precision full-automatic titration apparatus.

Detailed description of the preferred embodiments

The CL is determined by^-The best embodiment of the concentration is described in detail in conjunction with the accompanying drawings.

Blank group control was set first: 50ml of distilled water is poured into a blank group of titration bottles 9, the water sample is adjusted to be neutral, and the method comprises the following steps: adding 2-3 drops of phenolphthalein indicator, adding a small amount of NaOH solution until the solution turns to purple red, and adding a small amount of low-concentration H along the wall of the cup each time₂SO₄And (4) when the solution is suddenly colorless, the solution is neutral. And 2-3 drops of K are added₂CrO₄Indicator, finally put into clean rotor;

other preparation works are as follows: powering on the computer 18; due to titrated AgNO₃The standard solution is easily evaporated by light, so the pipette 12 and the pipette 14 are replaced by tubes made of opaque materials; after rinsing the pipette 12 and the pipette 14 with distilled water, AgNO was added₃The standard solution is rinsed for three times; prepared AgNO in advance₃Opening the brown bottle of the standard solution, inserting a pipette 14, placing a sealing cover 15 at the opening of the brown bottle, and sealing the standard solution;

titration of blank group: a pipette 12 is connected to the closure cap 7 through the opening 4, the closure cap 7 is placed at the opening of the blank set of titration bottles 9, and the titration needle 8 is inserted into the titration bottles 9. The positions of the brackets 5 and 21 in the clamping grooves 2 and 20 are adjusted, the lengths of the brackets 5 and 21 are adjusted, the color sensors 6 and 22 are aligned to the middle of the solution in the blank group of titration bottles 9, and the openable door 1 is closed. Sending instructions by the computer 18: firstly, adjusting the rotating speed of a magnetic stirring table 11 to uniformly stir the solution in a titration flask 9; opening the automatic valve 17; adjusting a precision flowmeter13, controlling the titration speed of the standard solution slowly because the blank group has less CL < - > content, receiving color information by the color sensors 6 and 22 as the color of the solution is closer to the titration end point and feeding back the color information to the computer 18, and sending an instruction by the computer 18 to adjust the titration speed of the precision flowmeter 13 to slow. When the titration end point is reached, the color sensor 6 quickly captures the color change of the solution, the detection result is uploaded, the automatic valve 17 quickly responds to close, the blank group titration is finished, and the computer 18 records the consumption of AgNO₃Standard solution volume.

And then treating the detected water sample: as the oilfield field water is used as the water sample to be detected in the case, the CL-content in the water sample is usually larger, so that the water sample to be detected can be diluted. According to the standard GB 11896-89, pouring 2ml of water sample into a water sample titration bottle 9, adding 48ml of distilled water, preparing 50ml of water sample to be detected, adjusting the water sample to be neutral, and finally adding 2-3 drops of K into the water sample titration bottle 9₂CrO₄Indicator, put into clean rotor.

Titration of the test water sample: repeating the titration step on the water sample to be measured, and recording the consumption AgNO by the precision flowmeter 13₃Standard solution volume.

AgNO consumed according to blank group and measured water sample group₃Calculating the CL in the water sample according to the volume of the standard solution^-And (4) content.

The invention can realize automatic and accurate measurement of the ion content in the water sample. The foregoing is only a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.