阅读说明：本技术 一种在实验室稳定生成活性气态汞的发生装置及其发生方法 (Generating device and generating method for stably generating active gaseous mercury in laboratory ) 是由 童银栋 吕广阔 张贺锋 卜晓鸽 于 2019-01-08 设计创作，主要内容包括：本发明提供一种在实验室稳定生成活性气态汞的发生装置及其发生方法,反应器内罐的外侧套接反应器外罐,反应器外罐的上部连接有反应器外罐上支管,在反应器外罐的下部连接有反应器外罐下支管,高纯空气源通过气体流量控制器与反应器内罐下支管的进气端相连,反应器内罐下支管的出气端贯穿反应器外罐与反应器内罐相连,反应器内罐下支管设置在反应器内罐的下部,反应器罐上支管的进气口贯穿反应器外罐与活性气态汞采样器相连,在反应器内罐的上部内侧开设有内螺纹,反应器内罐盖上设置有外螺纹,外螺纹与内螺纹相配合,在反应器内罐内放置聚四氟乙烯管,在聚四氟乙烯管放置HgCl<Sub>2</Sub>源。该发生装置结构简单,操作方便,反应稳定,挥发效率高。(The invention provides a generating device and a generating method for stably generating active gaseous mercury in a laboratory, wherein the outer side of an inner tank of a reactor is sleeved with an outer tank of the reactor, the upper part of the outer tank of the reactor is connected with an upper branch pipe of the outer tank of the reactor, the lower part of the reactor outer tank is connected with a reactor outer tank lower branch pipe, a high-purity air source is connected with the air inlet end of the reactor inner tank lower branch pipe through a gas flow controller, the air outlet end of the reactor inner tank lower branch pipe penetrates through the reactor outer tank and is connected with the reactor inner tank, the reactor inner tank lower branch pipe is arranged at the lower part of the reactor inner tank, the air inlet of the reactor upper branch pipe penetrates through the reactor outer tank and is connected with an active gaseous mercury sampler, an internal thread is arranged on the inner side of the upper part of the inner tank of the reactor, an external thread is arranged on the inner tank cover of the reactor and is matched with the internal thread, a polytetrafluoroethylene tube was placed in the reactor inner tank, and a source of HgCl2 was placed in the polytetrafluoroethylene tube. The generating device has the advantages of simple structure, convenient operation, stable reaction and high volatilization efficiency.)

1. a generating device for generating active gaseous mercury stably in a laboratory is characterized in that: comprises a high-purity air source, a gas flow controller, a reactor inner tank cover, a HgCl2 source, a polytetrafluoroethylene tube, a reactor inner tank and a reactor outer tank,

The outer side of the reactor inner tank is sleeved with the reactor outer tank, the upper part of the reactor outer tank is connected with an upper reactor outer tank branch pipe, the lower part of the reactor outer tank is connected with a lower reactor outer tank branch pipe, circulating cooling water is introduced into an interlayer formed between the reactor inner tank and the reactor outer tank, the circulating cooling water flows in through the lower reactor outer tank branch pipe and then flows out through the upper reactor outer tank branch pipe, the high-purity air source is connected with the air inlet end of the lower reactor inner tank branch pipe through the gas flow controller, the air outlet end of the lower reactor inner tank branch pipe penetrates through the reactor outer tank and is connected with the reactor inner tank, the lower reactor inner tank branch pipe is arranged at the lower part of the reactor inner tank, the air inlet of the upper reactor tank branch pipe penetrates through the reactor outer tank and is connected with the active gaseous mercury sampler, the inner thread is arranged at the inner side of the upper part of the reactor inner tank, the reactor inner tank cover is provided with an external thread, the external thread is matched with the internal thread, the polytetrafluoroethylene tube is placed in the reactor inner tank, the polytetrafluoroethylene tube is placed in the HgCl2 source, the polytetrafluoroethylene tube is wrapped by an aluminum foil, and two ends of the polytetrafluoroethylene tube are respectively provided with small holes.

2. The generating device for generating active gaseous mercury stably in a laboratory according to claim 1, characterized in that: the reactor inner tank and the reactor outer tank are quartz tank bodies.

3. The generating device for generating active gaseous mercury stably in a laboratory according to claim 1, characterized in that: the reactor inner tank is a hollow cylinder with the height of 20-22cm, the inner diameter of 50-52mm and the outer diameter of 55-57mm and an opening at the top end.

4. The generating device for generating active gaseous mercury stably in a laboratory according to claim 1, characterized in that: the reactor inner tank also comprises a bottleneck fixed at the top end of the reactor inner tank, and the bottleneck is a threaded hollow cylinder with the height of 5-6cm, the inner diameter of 50-52mm and the outer diameter of 55-57 mm.

5. The generating device for generating active gaseous mercury stably in a laboratory according to claim 1, characterized in that: the reactor inner tank cover is a polytetrafluoroethylene threaded cover and is divided into an inner part and an outer part, the inner part is threaded, the outer part is smooth, and the reactor inner tank cover is 5-6cm in height, 55-52mm in inner diameter and 55-57mm in outer diameter.

6. The generating device for generating active gaseous mercury stably in a laboratory according to claim 1, characterized in that: the lower branch pipe of the reactor inner tank and the upper branch pipe of the reactor inner tank adopt branch pipes with the length of 4-5cm, the inner diameter of 5-6mm and the outer diameter of 7-8 mm.

7. The generating device for generating active gaseous mercury stably in a laboratory according to claim 1, characterized in that: the outer tank of the reactor is a hollow cylinder with a height of 15-17cm, an inner diameter of 75-77mm and an outer diameter of 80-82mm and an opening at the top end.

8. The generating device for generating active gaseous mercury stably in a laboratory according to claim 1, characterized in that: the lower branch pipe of the outer tank of the reactor and the upper branch pipe of the outer tank of the reactor adopt branch pipes with the length of 4-5cm, the inner diameter of 5-6mm and the outer diameter of 7-8 mm.

9. The generating device for generating active gaseous mercury stably in a laboratory according to claim 1, characterized in that: the polytetrafluoroethylene tube is a hollow cylinder with two open ends and a height of 3-4cm, an inner diameter of 8-9mm and an outer diameter of 11-12mm, and the diameter of the small hole is 1-2 mm.

10. a method of generating gaseous mercury using a generating device for stable reactive gaseous mercury generation in a laboratory according to any of claims 1-9, comprising: the method comprises the following steps: after the active gaseous mercury sampling pipe is connected with the upper support pipe of the reactor tank, firstly, a circulating device for circulating cooling water is started, then, a gas flow controller is started, the flow rate of air introduced into the inner tank of the reactor is controlled through the gas flow controller, sampling time is set on the active gaseous mercury sampling pipe, during sampling, the air flow is trapped through the active gaseous mercury sampling pipe, and when the standard deviation is 12-15% for multiple times, the active gaseous mercury released by the mercury source is in a stable state after continuous collection.

Technical Field

The invention relates to the technical field of testing devices, in particular to a generating device and a generating method for stably generating active gaseous mercury in a laboratory.

Background

Mercury is the only heavy metal pollutant which can exist in a gaseous state in the atmosphere, and is one of the pollutants which are preferentially controlled by the mechanisms of the United nations environmental planning administration, the world health organization, the national environmental protection department, the United states environmental protection administration and the like. There are three main forms of atmospheric mercury: gaseous Elemental Mercury (GEM), Reactive Gaseous Mercury (RGM), and particulate mercury (PBM), wherein RGM is low in concentration in the atmosphere, but easily settles to the surface, presenting a potential threat to aquatic ecosystems and human health. The photoinduced morphological transformation of the RGM in the atmosphere is an important part of the atmospheric mercury environmental chemical behavior, the research on the influence of the morphological transformation of the RGM in the atmosphere is helpful for more accurately quantifying the global atmospheric mercury transport process, and the key point of the research is that a stable and reliable active gaseous mercury source can be obtained, so that the influence of the morphological transformation of the RGM in the atmosphere can be objectively evaluated.

Disclosure of Invention

The invention overcomes the defects in the prior art, the existing active gaseous mercury preparation equipment is unstable, the generation source of the active gaseous mercury mainly comprises a permeation form, a diffusion tube form and a solution form, and the mercury of the sources is easy to convert into mercury in other forms in the volatilization process.

The purpose of the invention is realized by the following technical scheme.

A generating device for stably generating active gaseous mercury in a laboratory comprises a high-purity air source, a gas flow controller, a reactor inner tank cover, a HgCl2 source, a polytetrafluoroethylene tube, a reactor inner tank and a reactor outer tank,

The outer side of the reactor inner tank is sleeved with the reactor outer tank, the upper part of the reactor outer tank is connected with an upper reactor outer tank branch pipe, the lower part of the reactor outer tank is connected with a lower reactor outer tank branch pipe, circulating cooling water is introduced into an interlayer formed between the reactor inner tank and the reactor outer tank, the circulating cooling water flows in through the lower reactor outer tank branch pipe and then flows out through the upper reactor outer tank branch pipe, the high-purity air source is connected with the air inlet end of the lower reactor inner tank branch pipe through the gas flow controller, the air outlet end of the lower reactor inner tank branch pipe penetrates through the reactor outer tank and is connected with the reactor inner tank, the lower reactor inner tank branch pipe is arranged at the lower part of the reactor inner tank, the air inlet of the upper reactor tank branch pipe penetrates through the reactor outer tank and is connected with the active gaseous mercury sampler, the inner thread is arranged at the inner side of the upper part of the reactor inner tank, the reactor inner tank cover is provided with an external thread, the external thread is matched with the internal thread, the polytetrafluoroethylene tube is placed in the reactor inner tank, the polytetrafluoroethylene tube is placed in the HgCl2 source, the polytetrafluoroethylene tube is wrapped by an aluminum foil, and two ends of the polytetrafluoroethylene tube are respectively provided with small holes.

The reactor inner tank and the reactor outer tank are quartz tank bodies.

The reactor inner tank is a hollow cylinder with the height of 20-22cm, the inner diameter of 50-52mm and the outer diameter of 55-57mm and an opening at the top end.

The reactor inner tank also comprises a bottleneck fixed at the top end of the reactor inner tank, and the bottleneck is a threaded hollow cylinder with the height of 5-6cm, the inner diameter of 50-52mm and the outer diameter of 55-57 mm.

The reactor inner tank cover is a polytetrafluoroethylene threaded cover and is divided into an inner part and an outer part, the inner part is threaded, the outer part is smooth, and the reactor inner tank cover is 5-6cm in height, 55-52mm in inner diameter and 55-57mm in outer diameter.

The lower reactor tank branch pipe and the upper reactor tank branch pipe are branch pipes with the length of 4-5cm, the inner diameter of 5-6mm and the outer diameter of 7-8mm, the lower reactor tank branch pipe is communicated with a high-purity air source and aims to promote the volatilization of a mercury source of a release pipe and reduce wall adsorption, and the upper reactor tank branch pipe is connected with an active mercury sampling pipe.

The outer tank of the reactor is a hollow cylinder with a height of 15-17cm, an inner diameter of 75-77mm and an outer diameter of 80-82mm and an opening at the top end.

The lower reactor outer tank branch pipe and the upper reactor outer tank branch pipe are branch pipes with the length of 4-5cm, the inner diameter of 5-6mm and the outer diameter of 7-8mm, and the lower reactor outer tank branch pipe and the upper reactor outer tank branch pipe are connected with circulating cooling water, so that the problem that volatilized mercury is adsorbed on the wall due to uneven temperature of the inner wall of the reactor is solved.

The polytetrafluoroethylene tube is a hollow cylinder with the height of 3-4cm, the inner diameter of 8-9mm and the outer diameter of 11-12mm, the two ends of the hollow cylinder are opened, the diameter of the small hole is 1-2mm, so that active gaseous mercury is slowly volatilized into an inner chamber of the reactor, the polytetrafluoroethylene tube is wrapped by aluminum foil and then placed into an inner reactor of the reactor, and photolysis is avoided.

A generating method for generating active gaseous mercury stably in a laboratory comprises the following steps: after the active gaseous mercury sampling pipe is connected with the upper support pipe of the reactor tank, firstly, a circulating device for circulating cooling water is started, then, a gas flow controller is started, the flow rate of air introduced into the inner tank of the reactor is controlled through the gas flow controller, sampling time is set on the active gaseous mercury sampling pipe, during sampling, the air flow is trapped through the active gaseous mercury sampling pipe, and when the standard deviation is 12-15% for multiple times, the active gaseous mercury released by the mercury source is in a stable state after continuous collection.

The invention has the beneficial effects that: the reactor of the device adopts quartz materials to reduce wall adsorption effect and mercury residue, all parts are tightly connected, good air tightness of the whole device is guaranteed, and in the process of generating active gas mercury, the flow introduced into the inner chamber of the reactor is controlled by the gas flow controller to promote stable volatilization of the mercury source and reduce wall adsorption.

Drawings

FIG. 1 is a schematic structural view of the present invention;

In the figure: 1 is high pure air source, 2 is gas flow controller, 3 is the reactor, 4 is cover in the reactor, 5 is the polytetrafluoroethylene pipe, 6 is the HgCl2 source, 7 is the reactor inner tank, 8 is reactor inner tank lower branch pipe, 9 is reactor jar upper branch pipe, 10 is the reactor outer tank, 11 is reactor outer tank upper branch pipe, 12 is reactor outer tank lower branch pipe.

For a person skilled in the art, other relevant figures can be obtained from the above figures without inventive effort.

Detailed Description

The technical solution of the present invention is further illustrated by the following specific examples.