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Method for Determination of Trace Arsenic in Rice by Solid Phase Extraction-Atomic Fluorescence Spectrometry

A kind of atomic fluorescence spectroscopy and rice technology, applied in fluorescence/phosphorescence, preparation of test samples, material excitation analysis, etc., can solve the problems of long analysis time, matrix interference, low sensitivity, etc., and achieve high sensitivity, high precision, accurate results

Active Publication Date: 2017-07-18
GUANGXI UNIV
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Problems solved by technology

Spectrophotometry has low sensitivity, cumbersome steps and long analysis time
Graphite furnace atomic absorption method has high sensitivity and good selectivity, but it is seriously interfered by the matrix and has strong background absorption

Method used

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  • Method for Determination of Trace Arsenic in Rice by Solid Phase Extraction-Atomic Fluorescence Spectrometry
  • Method for Determination of Trace Arsenic in Rice by Solid Phase Extraction-Atomic Fluorescence Spectrometry
  • Method for Determination of Trace Arsenic in Rice by Solid Phase Extraction-Atomic Fluorescence Spectrometry

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Embodiment Construction

[0037] The present invention will be further described below in conjunction with specific implementation.

[0038] The method for determining trace arsenic in rice by solid phase extraction-atomic fluorescence spectrometry is to separate and enrich arsenic by using chromatographic silica gel modified with ammonium pyrrolidine dithiocarbamate (APDC) as an adsorbent, and use thiourea-ascorbic acid as an adsorbent. Reducing agent and masking agent, established APDC solid phase extraction-atomic fluorescence spectrometry method for the determination of arsenic in rice. The fluorescence intensity of arsenic in rice samples was measured by atomic fluorescence spectrometry, and the concentration of arsenic was indirectly calculated by comparing with the standard working curve.

[0039] The reagents and chemical concentrations used in the method are all mass concentrations, and the grades are all analytically pure, and the specific operation steps are as follows:

[0040] 1. Adsorben...

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Abstract

The invention discloses a method for determining trace arsenic in rice through solid-phase extraction-atomic fluorescence spectrometry. The method comprises that chromatographic silica gel modified by ammonium pyrrolidine dithiocarbamate (APDC) is used as an adsorbent for separation and enrichment of arsenic, thiourea-ascorbic acid is used as a reducing agent and a masking agent, and the method for determining arsenic in the rice through the APDC solid-phase extraction-atomic fluorescence spectrometry is established. The fluorescence intensity of arsenic in the rice is measured by the method, and the content of arsenic is calculated from a standard curve. The method has the advantages that the method is a pretreatment method for determining the content of arsenic in the rice; the linear performance of the display method of a sample after treatment is good, and the method is low in detection limit, high in sensitivity, high in precision, simple and fast to operate, accurate in results, and suitable for determining the content of arsenic in the rice.

Description

technical field [0001] The invention belongs to the technical field of assay methods for arsenic content, in particular to a method for assaying trace arsenic in rice by solid-phase extraction-atomic fluorescence spectroscopy. Background technique [0002] Arsenic occurs naturally in groundwater and soil in some regions, through which this toxic element can be absorbed by crops and enter the food chain. Arsenic and its compounds have been recognized as carcinogens by the International Cancer Organization (IARC). Arsenic in food exists in different chemical forms, and the toxicity of inorganic arsenic is far greater than that of organic arsenic. as the basis. With the development of society, people pay more and more attention to food safety. Rice is one of our daily staple foods. According to China's national food safety standard "Standards for Limits of Contaminants in Food" (GB2762-2012), the limit index of inorganic arsenic in rice is 0.2mg / kg. In July 2014, the Codex A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/64G01N1/40
Inventor 陆建平覃梦琳
Owner GUANGXI UNIV
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