Sample collection device for atmospheric precipitation mercury isotope analysis

Abstract

The utility model provides a sample collecting device for atmospheric precipitation mercury isotope analysis, which comprises a water collecting component, a sampling bottle, a three-way valve, a reagent bottle and a peristaltic pump, the water collecting component is used for collecting atmospheric precipitation, and the water collecting component is provided with a water outlet hole and a heating component; the heating assembly is used for heating the solid atmospheric rainfall to form liquid atmospheric rainfall; the sampling bottle is provided with an accommodating space; the three-way valve is provided with a first channel opening, a second channel opening and a third channel opening, the first channel opening is connected with the water outlet hole through a pipeline, and the second channel opening is communicated with the containing space through a pipeline; an acid solution is stored in a bottle cavity of the reagent bottle; the inlet end of the peristaltic pump is connected to the bottle cavity, and the outlet end of the peristaltic pump is connected to the third channel opening. According to the utility model, the problems that the traditional atmospheric precipitation mercury sample collection method is tedious, time-consuming and labor-consuming, and the atmospheric precipitation mercury isotope analysis cannot be efficiently met are solved, and the sample collection and analysis cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of atmospheric sampling, and more specifically to a sample collecting device for atmospheric precipitation mercury isotope analysis. Background Art

[0002] Mercury, commonly known as quicksilver, is a toxic and hazardous heavy metal element. It is liquid at room temperature and pressure and can volatilize into the atmosphere, migrating and settling with atmospheric activity. In particular, gaseous oxidized mercury and particulate mercury are generally water-soluble and are easily adsorbed and dissolved by atmospheric precipitation, including liquid precipitation (rain) and solid precipitation (freezing rain, ice pellets, snow, graupel, and hail), before settling to the Earth's surface. Mercury that settles to the Earth's surface is converted by microorganisms into highly toxic methylmercury, which accumulates and amplifies in the food chain, posing serious risks to ecological and environmental safety and human health. Therefore, it is crucial to study and analyze the sources, migration, and transformation patterns of mercury in atmospheric precipitation. In recent years, with the rapid development of multi-collector plasma-mass spectrometry (MC-ICPMS), high-precision mercury isotope analysis techniques and methods have been established and applied, providing a technical means for the measurement and analysis of mercury isotopes in atmospheric precipitation. However, the concentration of mercury in atmospheric precipitation is extremely low, generally below 5 ng / L, and even only around 1 ng / L in background areas. The MC-ICPMS measurement accuracy requirement for mercury isotopes is above 10 ng, and the instrument measurement signal and accuracy are relatively high. Therefore, a large amount (more than 10 L) of atmospheric precipitation samples needs to be collected and pre-enriched to ensure the measurement requirements of mercury isotopes.

[0003] Traditional sampling methods for mercury and its isotope analysis in atmospheric precipitation primarily rely on manual multi-bottle collection and acid preservation. Specifically, when precipitation is observed, multiple sampling bottles (less than 1 L) are placed in an open area, with large-diameter funnels inserted into the bottle openings to facilitate the collection of precipitation samples. After the precipitation stops, the bottles are brought back to the laboratory and the precipitation samples are collected in a larger sampling bottle. If there is unmelted freezing rain, snow, sleet, or hail in the funnel, these samples must also be collected using tools and transferred to a larger sampling bottle, or allowed to melt before collection. Hydrochloric acid or nitric acid solution is then added to the sample in a specific proportion, based on the total volume of the collected precipitation sample. This oxidizes the mercury in the sample into mercury ions and preserves it for processing for mercury isotope analysis.

[0004] Traditional sample collection devices for mercury isotope analysis in atmospheric precipitation rely on manual observation of precipitation. Samples must be collected by manually placing sampling bottles immediately after precipitation occurs, followed by sample collection, acidification, and preservation. This process is extremely time-consuming and labor-intensive. Due to the inability to automatically collect and oxidize the mercury in samples using acid in situ, and the volatility of mercury, some samples may be lost due to inadequate acidification. If excessive mercury is lost, the collected samples will not meet the requirements for mercury isotope analysis. Furthermore, the holes inserted into the mouths of the sampling bottles are often not securely fixed and can easily become detached from the bottles in wind and rain, preventing the bottles from collecting sufficient precipitation samples. Furthermore, the collection of precipitation samples involves numerous manual steps and processes, which can easily introduce contamination and errors. These shortcomings hinder the collection and analysis of mercury isotope samples in precipitation and increase analysis costs.

[0005] In summary, the existing traditional precipitation mercury sample collection devices have the following defects: inconvenient solid precipitation collection, small sampling volume, low efficiency, complicated steps, time-consuming and labor-intensive, high cost, and inability to efficiently meet the needs of precipitation mercury isotope analysis. Utility Model Content

[0006] (1) Technical issues to be solved

[0007] The technical problem to be solved by the utility model is that the traditional precipitation mercury sample collection device has the defects of being inconvenient to collect solid precipitation, small sampling volume, low efficiency, complicated steps, time-consuming and labor-intensive, high cost, and unable to efficiently meet the needs of precipitation mercury isotope analysis.

[0008] (2) Technical solution

[0009] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0010] The utility model provides a sample collection device for mercury isotope analysis of atmospheric precipitation, comprising a water collection component, a sampling bottle, a three-way valve, a reagent bottle and a peristaltic pump, wherein the water collection component is used to collect atmospheric precipitation, and the water collection component is provided with a water outlet and a heating component, and the heating component is used to heat solid atmospheric precipitation to form liquid atmospheric precipitation; the sampling bottle has an accommodating space; the three-way valve has a first channel port, a second channel port and a third channel port, the first channel port is connected to the water outlet through a pipeline, and the second channel port is connected to the accommodating space through a pipeline; an acidic solution is stored in the bottle cavity of the reagent bottle; the inlet end of the peristaltic pump is connected to the bottle cavity, and the outlet end of the peristaltic pump is connected to the third channel port.

[0011] Preferably, the water collection assembly includes an outer water collection plate, an inner water collection plate and a plurality of supporting legs, one end of the outer water collection plate is connected to at least two of the supporting legs, the other end of the outer water collection plate is hinged to the inner water collection plate, and the end of the inner water collection plate facing away from the outer water collection plate is connected to at least two of the supporting legs.

[0012] Preferably, the outer water collecting plate and the inner water collecting plate are both made of stainless steel.

[0013] Preferably, the support leg is hinged to the outer water collecting plate, and / or the support leg is hinged to the inner water collecting plate.

[0014] Preferably, the surfaces of the outer water collecting plate and the inner water collecting plate are provided with a Teflon filter membrane layer.

[0015] Preferably, the heating temperature of the heating component is 40°C to 50°C.

[0016] Preferably, the acidic solution is a nitric acid solution or a hydrochloric acid solution.

[0017] Preferably, the peristaltic pump has an inlet flow rate of 1-100 ml per minute.

[0018] Preferably, the sampling bottle is a Teflon bottle or a borosilicate glass bottle.

[0019] (3) Beneficial effects

[0020] The above technical solution of the present utility model has at least the following advantages:

[0021] In the present invention, the inner and outer water collection plates have a large inner surface area and are provided with a heating assembly that can heat solid precipitation to convert it into liquid precipitation. During rainfall, large-volume automatic and efficient collection of liquid and solid precipitation samples can be achieved, greatly satisfying the measurement and analysis requirements of atmospheric precipitation mercury isotopes and improving the efficiency of atmospheric mercury isotope analysis, thereby providing a new sample collection technology method for studying the pollution sources and migration and transformation processes of atmospheric mercury. At the same time, the present invention solves the problems of the traditional atmospheric precipitation mercury sample collection method being cumbersome, time-consuming, and labor-intensive, saving the sample collection and analysis costs. By providing a sampling bottle, a three-way valve, a reagent bottle containing an acidic solution, and a peristaltic pump, after sampling, the peristaltic pump can pump the acidic solution in the reagent bottle into the sampling bottle containing liquid precipitation, thereby preserving the mercury ions in the precipitation sample for subsequent mercury isotope analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 It is a structural schematic diagram of a sample collection device for mercury isotope analysis of atmospheric precipitation provided by an embodiment of the utility model.

[0024] Figure 2 It is a structural schematic diagram of the water collection component provided by an embodiment of the utility model.

[0025] The reference numerals in the figures are:

[0026] 1. Water collection assembly; 2. Sampling bottle; 3. Three-way valve; 4. Reagent bottle; 5. Peristaltic pump; 11. Water outlet; 12. Heating assembly; 13. Outer water collection plate; 14. Inner water collection plate; 15. Support foot; 16. Hinge; 31. First channel opening; 32. Second channel opening; 33. Third channel opening. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0028] It should be noted that when an element is referred to as being “fixed to” or “disposed on” another element, it may be directly located on the other element or indirectly located on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0029] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate that the device or element must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate relative importance or the number of technical features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined. The following is a more detailed description of the specific implementation of this utility model in conjunction with specific embodiments:

[0031] like Figure 1 As shown, an embodiment of the utility model provides a sample collection device for mercury isotope analysis of atmospheric precipitation, including a water collecting component 1, a sampling bottle 2, a three-way valve 3, a reagent bottle 4 and a peristaltic pump 5. The water collecting component 1 is used to collect atmospheric precipitation, and the water collecting component 1 is provided with a water outlet 11 and a heating component 12, and the heating component 12 is used to heat solid atmospheric precipitation to form liquid atmospheric precipitation; the sampling bottle 2 has a accommodating space; the three-way valve 3 has a first channel port 31, a second channel port 32 and a third channel port 33, the first channel port 31 is connected to the water outlet 11 through a pipeline, and the second channel port 32 is connected to the accommodating space through a pipeline; the bottle cavity of the reagent bottle 4 stores an acidic solution; the inlet end of the peristaltic pump 5 is connected to the bottle cavity, and the outlet end of the peristaltic pump 5 is connected to the third channel port.

[0032] As one of the optional implementations of this embodiment, the water collection assembly 1 includes an outer water collection plate 13, an inner water collection plate 14, and a plurality of legs 15. One end of the outer water collection plate 13 is connected to at least two legs 15, the other end of the outer water collection plate 13 is hinged to the inner water collection plate 14, and the end of the inner water collection plate 14 facing away from the outer water collection plate 13 is connected to at least two legs 15. Specifically, the outer water collection plate 13 and the inner water collection plate 14 are hingedly connected by a hinge 16.

[0033] The structure of the water collection component 1 is as follows Figure 2 As shown ( Figure 2The figure shows the folded storage state of the water collection component 1). The water collection component 1 is a portable hinged openable and closable structure, which is connected by an inner water collection plate 14 and an outer water collection plate 13 through a hinge 16. Specifically, the dimensions of the outer water collection plate 13 are: 100 cm long, 50 cm wide, and 20 cm high; the dimensions of the inner water collection plate 14 are 2 cm smaller than those of the outer water collection plate 13. Both the outer water collection plate 13 and the inner water collection plate 14 are made of stainless steel plates with a thickness of 1 cm. The inner surfaces of the inner water collection plate 14 and the outer water collection plate 13 are covered with a layer of Teflon filter membrane to prevent the material from adsorbing mercury. The outer surfaces of the bottom plates of the outer water collection plate 13 and the inner water collection plate 14 are equipped with semiconductor temperature control plates (heating components 12), which can heat and control the temperature of the stainless steel plates when in use. The two corners on the same side of the outer water collection plate 13 and the inner water collection plate 14 (opposite side of the hinge 16) are respectively equipped with legs 15, which are used to support the water collection component 1 after it is opened when in use. Specifically, the support leg 15 is made of stainless steel. The baffle plate on one side of the outer water collecting plate 13 near the hinge 16 is provided with a water outlet 11, the connector of the water outlet 11 has a diameter of 5 cm and is used to connect a pipe to guide the precipitation into the sampling bottle 2 through the pipe.

[0034] As one of the optional implementations of this embodiment, the outer water collecting plate 13 and the inner water collecting plate 14 are both made of stainless steel.

[0035] As one of the optional implementations of this embodiment, the support leg 15 is hinged to the outer water collecting plate 13 ; in another embodiment, the support leg 15 is hinged to the inner water collecting plate 14 .

[0036] As one of the optional implementations of this embodiment, a Teflon filter membrane layer is provided on the surface of the outer water collecting plate 13 and the inner water collecting plate 14 .

[0037] As an optional implementation of this embodiment, the heating temperature of the heating component 12 is 40° C. to 50° C. Preferably, the heating temperature of the heating component 12 is 50° C.

[0038] As one optional implementation of this embodiment, the acidic solution is a nitric acid solution or a hydrochloric acid solution. Specifically, the acidic solution is a nitric acid solution or a hydrochloric acid solution with a concentration of 30%.

[0039] As one of the optional implementations of this embodiment, the injection flow rate of the peristaltic pump 5 is 1-100 ml per minute.

[0040] As one of the optional implementations of this embodiment, the sampling bottle 2 is a Teflon bottle or a borosilicate glass bottle.

[0041] After selecting the precipitation sample collection site, the utility model Figure 1It is installed at the sampling point as shown. Split the four legs 15 of the inner water collecting plate 14 and the outer water collecting plate 13, and pull them apart with force. Place the four legs 15 on a flat ground. For soil ground, the four legs 15 can be directly inserted into the soil, and the water collecting assembly 1 can be installed at the sampling point. After installation, the inner water collecting plate 14 and the outer water collecting plate 13 are arranged relatively tilted to form an inverted triangle arrangement, so that atmospheric precipitation can flow out of the water outlet 11 along the inclined slope of the inner water collecting plate 14 and the outer water collecting plate 13 under the action of its own gravity and kinetic energy. After the water collecting assembly 1 is installed, connect one end of the water pipe (5 cm in diameter) to the joint of the water outlet 11 of the water collecting assembly 1, and the other end to the three-way valve 3. The first channel 31 of the three-way valve 3 is connected to the water conduit, the second channel 32 is connected to the water inlet connector on the bottle cap of the sampling bottle 2. The sampling bottle 2 is a 5-20L Teflon bottle or borosilicate glass bottle. The size of the sampling bottle can be selected based on the total mercury concentration in the precipitation at the sampling point and the experimental requirements. The third channel 33 is connected to the peristaltic pump 5. One end of the peristaltic pump 5 is connected to the three-way valve 3, and the other end of the peristaltic pump 5 is connected to the reagent bottle 4, which contains a 30% nitric acid or hydrochloric acid solution.

[0042] After the entire sample collection device for mercury isotope analysis of atmospheric precipitation (hereinafter referred to as the precipitation sampling device) is installed and assembled, the power supply of the heating component 12 is turned on, and the precipitation sampling device enters the working state. At this time, the heating component 12 is controlled at 50°C, so that the temperature of the bottom plate of the inner water collection plate 14 and the outer water collection plate 13 is maintained at 20-50°C. The end of the three-way valve 3 connected to the peristaltic pump 5 is closed, and the end connected to the sampling bottle 2 is open. When precipitation occurs, if the precipitation falling on the inner water collection plate 14 and the outer water collection plate 13 is liquid precipitation (rainwater), it will quickly flow directly into the sampling bottle 2 through the water outlet 11 and be collected. If it is solid precipitation, it will be melted into liquid water by the heated bottom plate of the inner water collection plate 14 and the outer water collection plate 13, and then flow into the sampling bottle 2 through the water outlet 11 and be collected. When precipitation stops, the peristaltic pump 5 is powered on, and the three-way valve 3 is connected to one end of the peristaltic pump 5. The peristaltic pump 5 introduces the nitric acid or hydrochloric acid solution in the reagent bottle 4 into the sampling bottle 2, oxidizing the mercury in the precipitation sample into mercury ions and preventing the volatilization and loss of mercury. The injection flow rate of the peristaltic pump 5 is set to 1-100 ml per minute. The flow rate and injection time of the peristaltic pump 5 can be set according to the size of the sampling bottle 2 and the amount of precipitation sample collected. After the acid addition is completed, the peristaltic pump 5 is powered off, the acid addition is stopped, and the three-way valve 3 is closed to the end connected to the peristaltic pump 5. The precipitation sampling device returns to the working state for the next round of precipitation sampling. When the sampling bottle 2 is full of precipitation, a new sampling bottle 2 is replaced and the collected precipitation sample is taken to the laboratory for storage pending subsequent mercury isotope analysis.

[0043] This embodiment enables the automated and efficient collection of large volumes of both liquid and solid precipitation samples, significantly meeting the requirements for mercury isotope measurement and analysis in atmospheric precipitation, improving the efficiency of atmospheric mercury isotope analysis, and thus providing a new sample collection method for studying the pollution sources, migration, and transformation processes of atmospheric mercury. Furthermore, this utility model reduces the tediousness, time-consuming, and labor-intensive nature of traditional atmospheric precipitation mercury sample collection methods, saving sample collection and analysis costs.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A sample collection device for mercury isotope analysis of atmospheric precipitation, characterized in that: include: A water collection component, the water collection component is used to collect atmospheric precipitation, the water collection component is provided with a water outlet and a heating component, the heating component is used to heat solid atmospheric precipitation to form liquid atmospheric precipitation; A sampling bottle having an accommodating space; a three-way valve having a first channel opening, a second channel opening, and a third channel opening, wherein the first channel opening is connected to the water outlet through a pipe, and the second channel opening is connected to the accommodating space through a pipe; A reagent bottle, wherein an acidic solution is stored in a bottle cavity of the reagent bottle; A peristaltic pump, wherein the inlet end of the peristaltic pump is connected to the bottle cavity, and the outlet end of the peristaltic pump is connected to the third channel port.

2. The sample collection device for mercury isotope analysis of atmospheric precipitation according to claim 1, characterized in that: The water collection assembly includes an outer water collection plate, an inner water collection plate and multiple supporting legs. One end of the outer water collection plate is connected to at least two of the supporting legs, the other end of the outer water collection plate is hinged to the inner water collection plate, and the end of the inner water collection plate facing away from the outer water collection plate is connected to at least two of the supporting legs.

3. The sample collection device for mercury isotope analysis of atmospheric precipitation according to claim 2, characterized in that: The outer water collecting plate and the inner water collecting plate are both made of stainless steel.

4. The sample collection device for mercury isotope analysis of atmospheric precipitation according to claim 2, characterized in that: The support leg is hinged to the outer water collecting plate, and / or the support leg is hinged to the inner water collecting plate.

5. The sample collection device for mercury isotope analysis of atmospheric precipitation according to claim 2, characterized in that: The surfaces of the outer water collecting plate and the inner water collecting plate are provided with Teflon filter membrane layers.

6. The sample collection device for mercury isotope analysis of atmospheric precipitation according to claim 1, characterized in that: The heating temperature of the heating component is 40°C to 50°C.

7. The sample collection device for mercury isotope analysis of atmospheric precipitation according to claim 1, characterized in that: The acidic solution is a nitric acid solution or a hydrochloric acid solution.

8. The sample collection device for mercury isotope analysis of atmospheric precipitation according to claim 1, characterized in that: The peristaltic pump has an inlet flow rate of 1-100 ml per minute.

9. The sample collection device for mercury isotope analysis of atmospheric precipitation according to claim 1, characterized in that: The sampling bottle is a Teflon bottle or a borosilicate glass bottle.

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