Field Sampling Device for Metal Stable Isotopes in Groundwater

Abstract

The present invention provides a field sampling device for metal stable isotopes in groundwater, comprising a base and a sample dissolution cover. The base is in a "convex" shape, and the convex part of the base is a cavity for accommodating sampling samples. At the top of the convex part of the base, there is a piston opening with a radius slightly smaller than that of the cavity. The upper part of the base is connected to the sample dissolution cover by threads. A filter layer is provided at the piston opening. The filter layer includes a three-layer structure, which are arranged downward from the piston opening in sequence as a filter membrane, a diffusion gel, and a resin layer. The diameter of the filter layer is the same as the diameter of the cavity of the convex part of the base. The present invention is a passive sampling device for collecting metal element components in groundwater, which is widely used in the work carried out in the laboratory after in-situ collection, as a research and monitoring tool. Passive samplers can measure metals and organic compounds and are commonly used to monitor water quality and evaluate soil and sediment pollution and processes.

Description

Technical Field

[0001] The present invention relates to the field of passive sampling devices, and particularly to a field sampling device for metal stable isotopes in groundwater. Background Art

[0002] The biogeochemical cycle of metal elements in natural systems is usually accompanied by stable isotope fractionation. Due to recent analytical progress, supplementing the traditional stable isotope systems (H, C, O, N, S), more elements in the periodic table (Li, B, Mg, Si, Cl, Ca, Ti, V, Cr, Fe, Ni, Cu, Zn, Ge, Se, Br, Sr, Mo, Ag, Cd, Sn, Sb, Te, Ba, W, Pt, Hg, Tl, U) are being explored and may be used as new geochemical environmental tracers. Among them, the applied research in the fields of groundwater formation and evolution, environment and ecology mainly focuses on the following aspects: the origin and recharge of groundwater, water-rock interaction, including the development and formation of karst, the source tracing of water body pollution, tracking the flow of groundwater, and the source tracing of heavy metal pollution (Hg, Pb, Cr) in the atmosphere, water and soil. This not only creates a new direction for the research of groundwater in China, but also provides new technologies for the innovation of basic research in China. A special sampling device is required for the acquisition process of metal stable isotopes as source and process tracers. Summary of the Invention

[0003] In view of the above problems, the present invention introduces a special technique for the acquisition process of metal stable isotopes as source and process tracers, and provides a field sampling device for metal stable isotopes in groundwater.

[0004] Its main technical solution is: a field sampling device for metal stable isotopes in groundwater, including a base and a sample dissolution cover. The base is in a "convex" shape. The convex part of the base is a cavity, and the sampling sample is accommodated in the cavity. At the top of the convex part of the base, there is a piston port with a radius slightly smaller than the cavity, and the upper part of the base is connected to the sample dissolution cover.

[0005] Further, a filter layer is provided at the piston port. The filter layer includes a three-layer structure, which are arranged in sequence from the piston port downwards as a filter membrane, a diffusion gel and a resin layer.

[0006] Further, the cap and the sample dissolution cover are connected by threads.

[0007] Further, the length of the bottom layer of the base is 40 mm; the diameter of the filter layer is the same as the diameter of the cavity of the convex part of the base.

[0008] The beneficial effects of the present invention are as follows:

[0009] This invention patent discloses a passive sampling device for collecting metal element components in groundwater, which is widely used in situ or in the laboratory as a research and monitoring tool. The passive sampler can measure metals and organic compounds and is commonly used to monitor water quality and evaluate soil and sediment pollution and processes. The overall material is PFA and can be heated, with a sealing performance of over 99%. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Other features, objectives, and advantages of this application will become more apparent by reading the detailed description of the non-restrictive embodiments with reference to the following drawings:

[0011] Figure 1 FIG. is a schematic diagram of the overall structure of a field sampling device for non-traditional isotopes in groundwater;

[0012] Figure 2 FIG. is a schematic diagram of the base structure;

[0013] Figure 3 FIG. is a partially enlarged view of part A of the filter layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] The following further elaborates on this application with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are merely for explaining the relevant invention and not for limiting the invention. Additionally, it should be noted that for ease of description, only parts related to the invention are shown in the drawings.

[0015] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The following will detail this application with reference to the drawings and embodiments.

[0016] A field sampling device for non-traditional isotopes in groundwater includes a base 1, a sample dissolution cover 3, and a heating plate 4. The base 1 is in a "convex" shape, and the convex part of the base 1 is a cavity that accommodates the sampling sample (water sample). The top of the convex part of the base 1 is provided with a piston port with a radius slightly smaller than the cavity. The upper part of the base 1 is connected to the sample dissolution cover 3 by a thread.

[0017] A filter layer 2 is provided at the piston port. The filter layer 2 includes a three-layer structure, which are arranged in sequence from the piston port downwards as a filter membrane 201, a diffusion gel 202, and a resin layer 203.

[0018] The bottom layer of the base 1 has a length of 40 mm; the diameter of the filter layer 2 is the same as the diameter of the cavity of the convex part of the base 1.

[0019] Its working principle is as follows: The base 1 is internally filled with a pre-treated solution, which is connected to the sample dissolution cover 3 to form an integral body. Finally, the whole is a conical container with a smooth inner wall. The pre-treated solution 5 after filtration is at the bottom. The conical container is taken back to the laboratory to avoid contact with the atmosphere and prevent new pollutants from entering. The whole is placed on a heating plate 4 and heated at 96 - 98 °C. After heating, it can be found that water droplets 6 condense at the top of the container. Finally, the condensed water droplets 6 are used to measure the metal stable isotopes.

[0020] During sampling, an organic glass water sampler and a super-clean polypropylene (PP) sampling bottle are used to collect water samples. Before collection, the water sampler is rinsed with distilled water and then rinsed 3 times with the water body to be sampled. Each group of samples is collected in an amount of 1000 mL. 30 mL is filtered into a super-clean polypropylene (PP) sampling bottle using a disposable super-clean syringe and a polyethersulfone filter membrane with a pore size of 0.45 μm. 0.3 mL of analytical pure nitric acid solution with a concentration of 7.5 mol / L is added as a preservative. It is sealed with a disposable PM-996 Parafilm of the United States, the sample dissolution cover is tightened, and it is taken back to the laboratory for waiting to be processed and then used for the test of metal stable isotopes.

[0021] The present invention is a passive sampling device for collecting metal element components in groundwater, and is widely used as a tool for in-situ collection and then carrying out stable isotope tests in the laboratory for research and monitoring. The metal passive sampler can be used to measure metals and non-traditional stable isotopes, and is usually used for researching water / rock reactions, material sources (including pollutant sources), mixing of different water bodies, sources of river water, monitoring the pollution degree of groundwater, determining the leakage recharge amount between aquifers, and restoring the cave sediment environment, etc.

[0022] The above description is only the preferred embodiments of the present application and the explanation of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by mutually replacing the above features with the (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. An in-situ sampling device for metal stable isotopes in groundwater, comprising a base (1), a sample dissolution cover (3) and a heating plate (4), characterized in that: The base (1) is in a "convex" shape. The protruding part of the base (1) is a cavity which houses the sampling sample. The base (1) is threadedly connected to the sample dissolution cover (3). The top of the protruding part of the base (1) is provided with a piston port with a radius slightly smaller than that of the cavity. The length of the bottom layer of the base (1) is 40 mm. The diameter of the filter layer (2) is the same as the diameter of the cavity of the protruding part of the base (1). The filter layer (2) is provided at the piston port. The filter layer (2) includes a three-layer structure, which are arranged in sequence from the piston port downwards as a filter membrane (201), a diffusion gel (202) and a resin layer (203). The upper part of the base (1) is connected to the sample dissolution cover (3).

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