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HPLC-ICP-MS combined method for measuring arsenic form in soil

A technology of HPLC-ICP-MS and arsenic form, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problem of not distinguishing different forms, and achieve the effect of simplifying the operation steps

Pending Publication Date: 2019-10-15
SHANDONG CENT FOR DISEASE CONTROL & PREVENTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although a large number of environmental quality standards and food safety standards have listed arsenic as a priority control position, in most of the existing standards, the content limit of arsenic is only expressed as the total amount, without distinguishing different forms

Method used

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  • HPLC-ICP-MS combined method for measuring arsenic form in soil
  • HPLC-ICP-MS combined method for measuring arsenic form in soil
  • HPLC-ICP-MS combined method for measuring arsenic form in soil

Examples

Experimental program
Comparison scheme
Effect test

experiment example

[0045] Experimental example: Experimental design of different forms of arsenic extraction

[0046] A large number of studies have shown that phosphoric acid is a suitable extraction agent in the extraction process of different forms of arsenic in soil and sediment. This is mainly because phosphoric acid and arsenate have many similar chemical properties, such as ion size, dissociation constant, etc. Therefore, phosphoric acid and phosphate can form competitive adsorption with arsenic, thereby extracting and adsorbing in solids is not easy to be dissolved. arsenic, resulting in a higher extraction rate. It is also possible to add different auxiliary extraction substances in the extraction process to increase the extraction capacity, and to ensure that the extracted arsenic form does not transform into each other, and maintains the same original form as in the original sample.

[0047] In this experiment, phosphoric acid and ascorbic acid were selected as extraction solvents, a...

Embodiment

[0082] A method for HPLC-ICP-MS joint determination of arsenic form in soil, comprising the steps of:

[0083] (1) Sample pretreatment: Accurately weigh 0.2000 sample in a microwave digestion tank, 0.5molL -1 h 3 PO 4 +0.5molL -1 Keep 10ml of ascorbic acid in a microwave digestion apparatus at 40°C for 60min. After extraction, take it out and cool it to room temperature, transfer it to a 50ml centrifuge tube, set the volume to 20ml, centrifuge at 8000r / min, absorb the supernatant, and pass through a 0.25μm filter membrane Filter to obtain the sample solution to be tested.

[0084] (2) Configuration of standard solution: Accurately weigh 0.216g of monomethylarsenic (MMA), 0.103g of dimethylarsenic (DMA), 0.108g of arsenobetaine AsB, and 0.162g of arsenocholine AsC into 10mL volumetric flasks respectively, Dilute with pure water and prepare to 1.0 μg / mL standard stock solution Ⅰ; accurately pipette 1.0 mL of trivalent arsenic As with a concentration of 1000 μg / mL 3+ and 1.0...

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Abstract

The invention discloses an HPLC-ICP-MS combined method for measuring arsenic form in soil. Phosphoric acid-ascorbic acid is used as an extraction solution for performing sample pretreatment by microwave-assisted extraction, and qualitative and quantitative analysis on ten arsenic forms in the soil is carried out by combining a detection means of liquid chromatography inductive coupling plasma massspectrometry. The method disclosed by the invention is rapid and simple, has relatively high sensitivity and lower detection limit, and is accurate and reliable in determination result and capable ofmeeting the simultaneous measurement of various forms of arsenic in soil.

Description

technical field [0001] The invention relates to a method and application of high-performance liquid chromatography-inductively coupled plasma mass spectrometry for determining the form of arsenic in soil. Background technique [0002] Soil arsenic pollution is one of the most serious environmental and health problems in the world today. With the intensification of economic development and human behavior on the environment, mine development, sewage irrigation, application of arsenic-containing pesticides, chemical fertilizers, and organic fertilizers have led to a substantial increase in arsenic pollutants discharged into the soil. The mobility of arsenic in soil largely depends on its existing form, which determines its toxicity and its absorption by organisms, that is, bioavailability. The research on the speciation and bioavailability of arsenic in soil is an important basis for the diagnosis of pollution, the assessment of environmental health risks, and the remediation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/06G01N30/36G01N30/72
CPCG01N30/02G01N30/06G01N30/36G01N30/7253G01N2030/027G01N2030/062
Inventor 杨路平焦燕妮邵立君王国玲王林刘仲
Owner SHANDONG CENT FOR DISEASE CONTROL & PREVENTION
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