CN213337334U

CN213337334U - Mercury water quality analyzer

Info

Publication number: CN213337334U
Application number: CN202022048268.6U
Authority: CN
Inventors: 王栋; 袁芳; 葛华丽; 王德华
Original assignee: Meilianzhonghe Environmental Protection Equipment Beijing Co ltd
Current assignee: Meilianzhonghe Environmental Protection Equipment Beijing Co ltd
Priority date: 2020-09-17
Filing date: 2020-09-17
Publication date: 2021-06-01
Anticipated expiration: 2030-09-17

Abstract

The utility model provides a mercury water quality analyzer, including the control unit, the collection unit, reaction unit and analysis unit, the reaction unit is including the pond and the reaction tank of clearing up that communicate each other, clears up through liquid feed valve and feed pipe to the solution of clearing up of supply in the pond in the reaction process, and to supply the reductant in the reaction tank, indicator and extractant react, obtain orange chelate, monitor through the spectrophotometry, can carry out accurate quantitative analysis to the mercury ion content in the water sample, thereby realize full automated inspection. The analyzer adopts a small-dose detection mode, the sample consumption is small, the reagent can be effectively saved in the detection process, the detection precision is high, and the precision of ppm or even ppb level can be achieved; the heating device and the condenser pipe can adjust the temperature in the whole reaction process so as to adapt to the requirements of the reaction; the reaction unit is also provided with a pipeline for conveying a masking agent, so that interfering substances can be masked, and the detection precision is effectively improved.

Description

Mercury water quality analyzer

Technical Field

The utility model belongs to the environmental protection field of detecting, in particular to mercury water quality analyzer.

Background

Mercury (Hg) is one of the most toxic heavy metals in the environment and causes systemic neurological damage when entering humans, e.g., the water-borne illness in japan in the last century is caused by the accumulation of large amounts of methyl mercury in brain tissue. The mercury pollution of the current water body is mainly caused by human activities and mainly comes from waste water discharged by industries such as chlor-alkali, plastics, batteries, electronics and the like and waste medical appliances. Since mercury is distributed in the atmosphere, soil and water under natural background conditions, the migration and transformation of mercury also occur between land, water and air. Gaseous and particulate mercury in the atmosphere drifts with the wind, and a part of mercury falls on the ground or in a water body through wet sedimentation or dry sedimentation. Mercury in soil can volatilize into atmosphere, and can also be flushed into ground water by rainfall and permeate into underground water. Part of the mercury in the ground water enters the atmosphere due to volatilization, and most of the mercury is precipitated into the bottom mud. The mercury in the bottom mud, in any form, is converted into methyl mercury or dimethyl mercury directly or indirectly under the action of microorganisms. Dimethyl mercury can be decomposed into methyl mercury under acidic conditions. Methylmercury is soluble in water and therefore returns to the water from the bottom sludge. Methyl mercury ingested by aquatic organisms can accumulate in the body and be continuously enriched by the food chain. The concentration of methyl mercury in fish in mercury-polluted water body can be up to ten thousand times higher than that of water, so that the fish is endangered and the human body is endangered through a food chain. Therefore, the method has very important significance in monitoring the mercury content in the water body environment. At present, the colorimetric method is widely applied to detection of heavy metals due to the advantages of accuracy, simplicity, rapidness and the like, but the method needs to prepare samples one by one before detection, needs to consume more manual operations and has insufficient flexibility. And the equipment capable of realizing full-automatic detection of mercury content in a water sample by a colorimetric method is temporarily lacked in the prior art.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a mercury water quality analyzer.

The utility model discloses specific technical scheme as follows:

the utility model provides a mercury water quality analyzer, which comprises a control unit, an acquisition unit, a reaction unit and an analysis unit, wherein the reaction unit comprises a digestion tank and a light-transmitting reaction tank which are mutually communicated, and an infusion pump is arranged on a connecting pipeline between the digestion tank and the reaction tank; the reaction unit further comprises a first liquid supply pipe connected into the digestion tank, a second liquid supply pipe, a third liquid supply pipe and a fourth liquid supply pipe connected into the reaction tank, the first liquid supply pipe is connected with a first liquid storage barrel containing digestion liquid through a first liquid supply valve, the second liquid supply pipe is connected with a second liquid storage barrel containing a reducing agent through a second liquid supply valve, the third liquid supply pipe is connected with a third liquid storage barrel containing an indicator through a third liquid supply valve, the fourth liquid supply pipe is connected with a fourth liquid storage barrel containing an extracting agent through a fourth liquid supply valve, a liquid discharge valve is arranged at the bottom of the reaction tank, the collection unit collects water samples and injects the water samples into the digestion tank, and the control unit sequentially controls the first liquid supply valve, the infusion pump, the second liquid supply valve, the third liquid supply valve, the fourth liquid supply valve and the liquid discharge valve to be opened and closed, and only one is opened at the same time; the analysis unit comprises a light source and a photometer sensor which are oppositely arranged at two sides of the reaction cell.

Furthermore, the reaction unit further comprises a fifth liquid supply pipe connected into the reaction tank, the fifth liquid supply pipe is connected with a fifth liquid storage barrel containing a masking agent through a fifth liquid supply valve, and the control unit controls the fifth liquid supply valve to be opened after the liquid discharge valve is closed.

Furthermore, the bottom of the reaction tank is conical and is connected with a liquid discharge pipe, and the liquid discharge valve is arranged on the liquid discharge pipe.

Further, a waste liquid barrel is arranged below the liquid discharge pipe, a weight sensor is arranged at the bottom of the waste liquid barrel, and when the mass of liquid discharged by the liquid discharge pipe exceeds a preset threshold value of the weight sensor, the control unit controls the liquid discharge valve to be closed.

Furthermore, a heating device is arranged at the bottom of the digestion tank, and a condensing pipe is wound and distributed on the connecting pipeline.

Further, the collection unit includes the sample dish that holds a plurality of water samples, still includes interconnect's arm and autoinjection needle and by the first driving motor and the second driving motor of the control unit control, first driving motor drive arm horizontal migration, the drive of second driving motor the arm reciprocates.

The utility model has the advantages as follows: the utility model provides a mercury water quality analyzer, including the control unit, the acquisition unit, reaction unit and analytic unit, the reaction unit is including the pond and the reaction tank of clearing up that communicate each other, the solution is cleared up to the supply in clearing up the pond through feed valve and feed pipe in the reaction process, and supply reductant in to the reaction tank, indicator and extractant react, obtain orange chelate, later under the shining of light source, detect its absorbance value at 485nm wavelength portion with the photometer sensor, can carry out accurate quantitative analysis to the mercury ion content in the water sample, thereby realize full automated inspection. The analyzer adopts a small-dose detection mode, the sample consumption is small, the reagent can be effectively saved in the detection process, the detection precision is high, and the precision of ppm or even ppb level can be achieved; the heating device and the condenser pipe can adjust the temperature in the whole reaction process so as to adapt to the requirements of the reaction; the reaction unit is also provided with a pipeline for conveying a masking agent, so that redundant indicators and other heavy metal ions can be masked, and the detection precision is effectively improved.

Drawings

FIG. 1 is a schematic structural diagram of a reaction unit in a mercury water quality analyzer provided by an embodiment;

fig. 2 is a schematic structural diagram of a collection unit in the mercury water quality analyzer provided by the embodiment.

Wherein: 1. a digestion pool; 101. a first liquid supply tube; 102. a first liquid supply valve; 103. a first liquid storage barrel; 104. an infusion pump; 2. a reaction tank; 201. a second liquid supply tube; 202. a second liquid supply valve; 203. a second liquid storage barrel; 204. a third liquid supply tube; 205. a third liquid supply valve; 206. a third liquid storage barrel; 207. a fourth supply tube; 208. a fourth liquid supply valve; 209. a fourth liquid storage barrel; 210. a drain valve; 211. a fifth liquid supply tube; 212. a fifth liquid supply valve; 213. a fifth liquid storage barrel; 214. a liquid discharge pipe; 215. a waste liquid barrel; 216. a weight sensor; 3. an infrared light source; 4. a photometric sensor; 5. a condenser tube; 6. a sample tray; 61. a mechanical arm; 62. an automatic sample injection needle; 63. a first drive motor; 64. a second drive motor.

Detailed Description

The present invention will be described in further detail with reference to the following examples and drawings.

Examples

As shown in fig. 1, the embodiment provides a mercury water quality analyzer, which includes a control unit (a single chip microcomputer chip with the model of STC12C5a60S2 is selected, various control circuits such as data acquisition, data processing, data analysis, data display, logic judgment, and path switching are integrated on the single chip microcomputer chip, and are used for executing various functions of the analyzer), an acquisition unit, a reaction unit, and an analysis unit, wherein the reaction unit includes a digestion tank 1 and a transparent reaction tank 2 which are communicated with each other, and a connection pipeline between the digestion tank 1 and the reaction tank 2 is provided with an infusion pump 104; the reaction unit further comprises a first liquid supply pipe 101 connected into the digestion tank 1, a second liquid supply pipe 201, a third liquid supply pipe 204 and a fourth liquid supply pipe 207 connected into the reaction tank 2, the first liquid supply pipe 101 is connected with a first liquid storage barrel 103 containing digestion liquid (a mixed solution of potassium permanganate and potassium persulfate) through a first liquid supply valve 102, the second liquid supply pipe 201 is connected with a second liquid storage barrel 203 containing a reducing agent (hydroxylamine hydrochloride solution) through a second liquid supply valve 202, the third liquid supply pipe 204 is connected with a third liquid storage barrel 206 containing an indicator (double-sulfur hydrazone solution) through a third liquid supply valve 205, the fourth liquid supply pipe 207 is connected with a fourth liquid storage barrel 209 containing an extracting agent (trichloromethane or carbon tetrachloride) through a fourth liquid supply valve 208, a liquid discharge valve 210 is arranged at the bottom of the reaction tank 2, and after the collecting unit collects a water sample and injects the water into the digestion tank 1, the control unit sequentially controls the first liquid supply valve 102, the second liquid supply pipe 103, the third liquid supply pipe 204 and the fourth, The infusion pump 104, the second liquid supply valve 202, the third liquid supply valve 205, the fourth liquid supply valve 208 and the liquid discharge valve 210 are opened and closed, and only one position is opened at a time; the analysis unit comprises a light source 3 and a photometric sensor 4 (a photometric sensor of the type OUSAF 11) which are oppositely arranged on both sides of a reaction cell 2. All the valves adopt miniature peristaltic valves so as to control lower flow rate, thereby saving reagents and realizing low-dose detection; the time for opening and closing each time of each peristaltic pump and the amount of liquid released are preset according to the reaction requirements and are specifically controlled by the control unit.

When the device works, firstly, the device is started, after the instrument is automatically debugged, the control unit controls the acquisition unit to absorb a sample and inject the sample into the digestion pool 1, at the moment, the first liquid supply valve 102 is opened, a digestion solution in the first liquid storage barrel 103 is released into the digestion pool 1 through the first liquid supply pipe 101 to digest a water sample, all mercury is converted into dipotassium mercury ions convenient to detect, after the digestion is finished, the infusion pump 104 is opened, and the digested water sample is transferred into the reaction pool 2; then, the second liquid supply valve 202 is opened, the reducing agent (hydroxylamine hydrochloride) in the second liquid supply barrel 203 is added into the reaction tank 2 through the second liquid supply pipe 201 to reduce the excess digestion solution, and then the third liquid supply valve 205 is opened, the indicator (dithizone) in the third liquid storage barrel 206 is added into the reaction tank 2 through the third liquid supply pipe 204 to react with mercury ions to generate orange chelate; after the reaction is finished, the fourth liquid supply valve 208 is opened, the extracting agent in the fourth liquid storage barrel 209 is added into the reaction tank through the fourth liquid supply pipe 207, the chelate is extracted, after the extraction is sufficient, the liquid discharge valve 210 is opened, the lower-layer water phase is discarded, and under the irradiation of the light source 3, the absorbance value of the reserved organic phase at the wavelength of 485nm is detected by using the photometric sensor 4, so that the mercury ion content in the water sample can be accurately and quantitatively analyzed. After the detection is finished, the liquid discharge valve 210 is opened again to discharge the organic phase, and the detection can be finished.

In some specific embodiments, the reaction unit further includes a fifth liquid supply pipe 211 connected to the reaction tank 2, the fifth liquid supply pipe 211 is connected to a fifth liquid storage barrel 213 containing a masking agent (sodium hydroxide solution + 1% disodium EDTA) through a fifth liquid supply valve 212, and the control unit controls the fifth liquid supply valve 212 to be opened after the liquid discharge valve 210 is closed.

After extraction and liquid separation are finished, the fifth liquid supply valve 212 is opened, the masking agent in the fifth liquid storage barrel 213 is added into the reaction tank 2 through the fifth liquid supply pipe 211, redundant dithizone is neutralized by sodium hydroxide, interference of copper ions (at least 300 mu g can be masked) is masked by EDTA disodium, and then detection is carried out, so that the detection precision can be effectively improved.

In some embodiments, the bottom of the reaction well 2 is tapered and connected with a drain 214, and the drain valve 210 is disposed on the drain 214. The bottom of the reaction tank 2 is set to be in a funnel shape, so that the liquid separation operation can be conveniently carried out.

The above embodiment may be further modified as follows: a waste liquid barrel 215 is arranged below the drain pipe 214, a weight sensor 216 is arranged at the bottom of the waste liquid barrel 215, and when the mass of the liquid discharged from the drain pipe 214 exceeds a preset threshold value (which can be set to be equal to the weight of the water sample collected by the collecting unit) of the weight sensor 216, the control unit controls the drain valve 210 to close and stop discharging the liquid.

In some specific embodiments, the bottom of the digestion tank 1 is provided with a heating device, which can be heated (preferably at 95 ℃) during the digestion process to promote the digestion reaction; meanwhile, the condensing pipe 5 (connected with an external water source) is wound and distributed on the connecting pipeline, so that the water sample after digestion can be cooled in the process of conveying the water sample to reach a temperature suitable for detection.

As shown in fig. 2, in some specific embodiments, the collection unit includes a sample tray 6 for holding a plurality of sampled samples, and further includes a robot arm 61 and an automatic sampling needle 62 connected to each other, and a first driving motor 63 and a second driving motor 64 controlled by the control unit, wherein the first driving motor 63 drives the robot arm 61 to move horizontally, and the second driving motor 64 drives the robot arm 61 to move up and down. The robotic arm 61 can be adjusted to a suitable position by the cooperation of the first drive motor 63 and the second drive motor 64, so that the automatic sampling needle 62 can be inserted into a sample bottle at a specific position on the sample tray 6 for sampling.

The detection range of the detector for mercury ions in water is 0-40 mug/L, the detector can be expanded according to an actual water sample on site, and the lowest detection concentration can reach 2 mug/L; the required quantity of the sample and the reagent is small, and the detection of ppm or even ppb level precision can be realized.

The present invention is not limited to the above-mentioned preferred embodiments, and any other products in various forms can be obtained by the teaching of the present invention, but any changes in the shape or structure thereof, which have the same or similar technical solutions as the present invention, fall within the protection scope of the present invention.

Claims

1. The mercury water quality analyzer is characterized by comprising a control unit, a collecting unit, a reaction unit and an analyzing unit, wherein the reaction unit comprises a digestion pool (1) and a light-transmitting reaction pool (2) which are communicated with each other, and a liquid conveying pump (104) is arranged on a connecting pipeline of the digestion pool (1) and the reaction pool (2); the reaction unit further comprises a first liquid supply pipe (101) connected into the digestion tank (1) and a second liquid supply pipe (201), a third liquid supply pipe (204) and a fourth liquid supply pipe (207) connected into the reaction tank (2), the first liquid supply pipe (101) is connected with a first liquid storage barrel (103) containing digestion liquid through a first liquid supply valve (102), the second liquid supply pipe (201) is connected with a second liquid storage barrel (203) containing reducing agent through a second liquid supply valve (202), the third liquid supply pipe (204) is connected with a third liquid storage barrel (206) containing indicator through a third liquid supply valve (205), the fourth liquid supply pipe (207) is connected with a fourth liquid storage barrel (209) containing extractant through a fourth liquid supply valve (208), a liquid discharge valve (210) is arranged at the bottom of the reaction tank (2), and the collection unit collects and injects a water sample into the digestion tank (1), the control unit controls the first liquid supply valve (102), the infusion pump (104), the second liquid supply valve (202), the third liquid supply valve (205), the fourth liquid supply valve (208) and the liquid discharge valve (210) to be opened and closed in sequence, and only one position is opened at the same time; the analysis unit comprises a light source (3) and a photometer sensor (4) which are oppositely arranged at two sides of the reaction cell (2).

2. The mercury water quality analyzer according to claim 1, wherein the reaction unit further comprises a fifth liquid supply pipe (211) connected to the reaction tank (2), the fifth liquid supply pipe (211) is connected to a fifth liquid storage barrel (213) containing a masking agent through a fifth liquid supply valve (212), and the control unit controls the fifth liquid supply valve (212) to be opened after the liquid discharge valve (210) is closed.

3. A mercury water quality analyzer according to claim 1, characterized in that the bottom of the reaction tank (2) is conical and connected with a drain pipe (214), and the drain valve (210) is arranged on the drain pipe (214).

4. A mercury water quality analyzer according to claim 3, characterized in that a waste liquid barrel (215) is arranged below the liquid discharge pipe (214), a weight sensor (216) is arranged at the bottom of the waste liquid barrel (215), and the control unit controls the liquid discharge valve (210) to close when the liquid quality discharged from the liquid discharge pipe (214) exceeds a preset threshold value of the weight sensor (216).

5. The mercury water quality analyzer according to claim 1, wherein a heating device is arranged at the bottom of the digestion tank (1), and a condensing pipe (5) is wound on the connecting pipeline.

6. A mercury water quality analyzer according to claim 1, wherein the collecting unit comprises a sample tray (6) for containing a plurality of water samples, and further comprises a mechanical arm (61) and an automatic sampling needle (62) which are connected with each other, and a first driving motor (63) and a second driving motor (64) which are controlled by the control unit, wherein the first driving motor (63) drives the mechanical arm (61) to move horizontally, and the second driving motor (64) drives the mechanical arm (61) to move up and down.