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Standard substance for morphological analysis of trivalent arsenic element and preparation method of standard substance

A technology of standard substance and element form, applied in the direction of analyzing materials, material separation, measuring devices, etc., can solve problems such as difficulty in storage, easy transformation, instability of arsenic standard substance, etc., and achieve the effect of accurate value and good stability

Active Publication Date: 2018-03-30
SHANDONG MEASUREMENT SCI RES INST
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Problems solved by technology

[0013] The present invention provides a standard substance for speciation analysis of trivalent arsenic and its preparation method to solve the instability of the existing standard substance of arsenic element, especially the easy conversion between trivalent arsenic and pentavalent arsenic, Difficult to stockpile problem

Method used

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  • Standard substance for morphological analysis of trivalent arsenic element and preparation method of standard substance
  • Standard substance for morphological analysis of trivalent arsenic element and preparation method of standard substance
  • Standard substance for morphological analysis of trivalent arsenic element and preparation method of standard substance

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Embodiment 1

[0037] A preparation method for a standard substance used for speciation analysis of trivalent arsenic, comprising the following steps:

[0038] Step S100, take trivalent arsenic compound raw materials, sodium arsenite, arsenic trichloride or arsenic trioxide can be selected, and sodium arsenite is selected in this embodiment, and sodium arsenite is analyzed by high-resolution mass spectrometry and HPLC-ICP-MS method The purity of sodium arsenite in the raw material, specifically, confirm the morphological structure of the sodium arsenite raw material by high-resolution mass spectrometry, and analyze the purity of sodium arsenite in the sodium arsenite raw material by HPLC-ICP-MS method.

[0039] In step S200, it is determined whether the sodium arsenite raw material contains arsenic compounds in other forms than sodium arsenite; specifically, according to the morphological structure of the sodium arsenite raw material confirmed by high-resolution mass spectrometry in step S100...

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Abstract

The invention discloses a standard substance for morphological analysis of a trivalent arsenic element and a preparation method of the standard substance. The preparation method comprises the following steps of analyzing the purity of a trivalent arsenic compound in a trivalent arsenic compound raw material by a high resolution mass spectrometry method and an HPLC-ICP-MS (High Performance Liquid Chromatography-Inductively Coupled Plasma-Mass Spectrometry) method; when the trivalent arsenic compound raw material is free of any other arsenic element compound, preparing a trivalent arsenic compound solution, and adding thiourea and ascorbic acid to the trivalent arsenic compound solution to obtain a trivalent arsenic compound pretreatment solution; adding a distilled and purified MOS (Metal Oxide Semiconductor) hydrochloric acid solution to the trivalent arsenic compound pretreatment solution to obtain a trivalent arsenic compound stabilization solution; performing packaging under high-purity nitrogen protection to obtain the standard substance; and performing combined measurement on the concentration of trivalent arsenic in the standard substance. The standard substance is good in stability, meets the morphological analysis of the trivalent arsenic element, and avoids resource waste and environmental pollution caused by discard due to long-term disuse.

Description

technical field [0001] The invention relates to the field of element speciation analysis, in particular to a standard substance for trivalent arsenic element speciation analysis and a preparation method thereof. Background technique [0002] In order to ensure food quality and safety and environmental monitoring, my country has formulated "GB2762-2005 Contaminant Limits in Food" to stipulate the limit standards of methylmercury, inorganic arsenic, nitrite, etc. in various food matrices, and also formulated "GB5749 Living Sanitary Standards for Drinking Water also stipulates routine indicators such as chromium (hexavalent), bromate, chlorite, and chlorate. Therefore, inorganic arsenic, as an important indicator, has become a hot spot in environmental and food analysis. Usually, HPLC-ICP-MS (High Performance Liquid Chromatography–Inductively Coupled Plasma-Mass Spectrometry, High Performance Liquid Chromatography-Inductively Coupled Plasma-Mass Spectrometry) is used to separat...

Claims

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Application Information

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IPC IPC(8): G01N30/06G01N30/02
CPCG01N30/02G01N30/06G01N2030/042
Inventor 孙倩芸林振强郭波叶谦辉齐萌荆培强李锋丽崔震
Owner SHANDONG MEASUREMENT SCI RES INST
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