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Soil Cd/Pb combined pollution bimetallic isotope source analysis method and system

An isotope source and compound pollution technology, which is applied in the analysis of materials, material analysis by electromagnetic means, and measurement devices, can solve the problems of reducing the accuracy of Cd single isotope source analysis results and fuzzy Cd isotope signals, achieving good traceability , Analysis results are objective and accurate

Active Publication Date: 2022-02-18
INST OF GEOCHEM CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, geochemical processes such as adsorption, dissolution, redox reactions, and biological processes in the soil will lead to the fractionation of Cd isotopes, which will obscure the Cd isotope signals of pollution sources, thereby reducing the accuracy of Cd single isotope source analysis results.

Method used

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  • Soil Cd/Pb combined pollution bimetallic isotope source analysis method and system
  • Soil Cd/Pb combined pollution bimetallic isotope source analysis method and system
  • Soil Cd/Pb combined pollution bimetallic isotope source analysis method and system

Examples

Experimental program
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Effect test

Embodiment 1

[0051] A kind of farmland soil Cd / Pb composite pollution double metal isotope source analysis method, such as figure 1 shown, including the following steps:

[0052] The soil sample and the risk source sample are respectively collected through the sample collection device, and the soil sample and the risk source sample are respectively obtained;

[0053] Measure the Cd and Pb isotope ratios of the soil sample and the risk source sample respectively to obtain the Cd and Pb isotope ratio of the soil sample and the Cd and Pb isotope ratio of the risk source sample;

[0054] Use the Cd and Pb isotope ratios of soil samples as coordinates for mapping, and use the Cd and Pb isotope ratios of risk source samples as coordinates for mapping to obtain the isotope ratio projection map;

[0055] Identify the polluted endmembers of polluted farmland soil through the isotope ratio projection map, obtain the polluted endmember identification results, and then confirm the polluted endmembers...

Embodiment 2

[0069] Present embodiment except following feature other structures are with embodiment 1:

[0070] The farmland soil affected by a large-scale polymetallic mine in South China was selected as the implementation area. According to the pollution characteristics of the implementation area, with the mine as the center, the surface soil of 0-20 cm in the surrounding 4 paddy fields was randomly collected, respectively numbered P1, P2, P3, and P4, collect samples of potential risk sources at the same time: mine wastewater sedimentation, atmospheric deposition, parent material, chemical fertilizers, and background soil. That is, the surrounding 4 paddy fields include: the first orientation, the second orientation, the third orientation, and the fourth orientation; the first type of risk source sample is mine wastewater precipitation, and the second type of risk source sample is atmospheric deposition, so The third type of risk source sample is parent material, the fourth type of risk...

Embodiment 3

[0086] A kind of farmland soil Cd / Pb compound pollution double metal isotope source analysis system, such as Figure 4 shown, including:

[0087] Sample collection module for collecting soil samples and risk source samples;

[0088] The sample determination module is used to determine the Cd and Pb isotope ratios of soil samples and risk source samples, and obtain the Cd and Pb isotope ratios of soil samples and the Cd and Pb isotope ratios of risk source samples;

[0089] The mapping module uses the Cd and Pb isotope ratios of soil samples as coordinates for mapping, and uses the Cd and Pb isotope ratios of risk source samples as coordinates for mapping to obtain isotope ratio projections;

[0090] The identification and confirmation module is used for the isotope ratio projection map to identify the polluted end members of polluted farmland soil, obtain the polluted end member identification results, and then confirm the polluted end members;

[0091] The relative contribu...

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Abstract

The invention discloses a farmland soil Cd / Pb combined pollution bimetallic isotope source analysis method. The method comprises the following steps of respectively collecting a soil sample and a risk source sample through a sample collection device; respectively measuring Cd and Pb isotope ratios of the soil sample and the risk source sample; drawing by using the Cd and Pb isotope ratios of the soil sample and the risk source sample as coordinates to obtain an isotope ratio projection drawing; identifying a polluted end member of the polluted farmland soil through the isotope ratio projection drawing to obtain a polluted end member identification result, and further confirming the polluted end member; and calculating the relative contribution rate of the polluted end member to obtain an isotope source analysis result. The method is advantaged in that by utilizing mutual restriction and mutual verification of Cd-Pb metal isotopes, a problem of poor analysis accuracy caused by similar or overlapped sample isotope values and isotope fractionation is solved, and accurate identification and quantitative analysis of the Cd / Pb heavy metal pollution source of the farmland soil are realized.

Description

technical field [0001] The invention relates to the research field of prevention and control of soil heavy metal pollution, in particular to a method and system for analyzing soil Cd / Pb compound pollution bimetallic isotope sources. Background technique [0002] Heavy metals Cd and Pb are globally recognized toxic metal elements. Cd and Pb in the soil are difficult to migrate, have the characteristics of high toxicity, refractory degradation, and biomagnification through food chains and food webs, which pose a huge threat to human health. Therefore, soil Cd / Pb compound pollution has certain particularity, and it is a difficult point in soil heavy metal pollution control, and it has always been a hot and difficult research topic at home and abroad. With the increasing Cd / Pb pollution in farmland soil, simply studying the form, type and spatial distribution of heavy metal pollutants in soil cannot meet the current needs of farmland soil treatment. However, due to the complex...

Claims

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Application Information

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IPC IPC(8): G01N27/626
CPCG01N27/626Y02A20/20
Inventor 夏亚飞刘承帅高庭刘宇晖
Owner INST OF GEOCHEM CHINESE ACADEMY OF SCI
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