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A method for the separation and determination of arsenic in PM2.5

A determination method and arsenic speciation technology, applied in the field of detecting air pollutants, can solve problems such as limited research, and achieve the effects of low acidity, environmental friendliness and good precision of the extractant

Active Publication Date: 2017-10-31
济南市环境保护科学研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Existing research mainly focuses on atmospheric particulate matter TSP, PM 10 , Analysis of the total amount of arsenic in PM2.5, the research on the analysis of the speciation of arsenic in particulate matter is relatively limited, especially the analysis of the speciation of arsenic in PM2.5 is rarely reported

Method used

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  • A method for the separation and determination of arsenic in PM2.5
  • A method for the separation and determination of arsenic in PM2.5
  • A method for the separation and determination of arsenic in PM2.5

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Embodiment 1

[0015] 1) Use 25cm*20cm glass fiber filter membrane for sampling;

[0016] 2) Cut 1 / 4 filter membrane into a 50 mL centrifuge tube, add 1% HNO 3 Solution 5mL, shake and mix well; transfer the solution into a polypropylene digestion tank for microwave digestion, digestion program: 55°C-10 min, 75°C-10 min, 90°C-30min, power set to 1200 W; cool down after digestion To room temperature, centrifuge the digestion solution at 5000 rpm for 10 min, take the supernatant into a 50 mL centrifuge tube, add 1% HNO 3 Dilute to 15 mL; store at -80°C until separation and determination by high performance liquid chromatography-inductively coupled plasma mass spectrometry;

[0017] Separation conditions: at 10 mmol L -1 NH 4 NO 3 , (NH 4 ) 2 HPO 4 The mixed solution was used as the mobile phase, and HNO 3 Adjust the pH to 6.2. The mobile phase passes through a 0.45 μm filter membrane to avoid polluting the sample separation column, and the speed of the mobile phase during the separatio...

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Abstract

The invention provides a method for separation and determination of arsenic in PM2.5. According to the method, nitric acid with a concentration of 1% is used as an extraction solvent, and high performance liquid chromatography and inductively coupled plasma mass spectrometer are used in combination for extraction and determination of arsenic forms in PM2.5. The method can completely separate arsenic of four different forms within 10 min, wherein the arsenic forms include trivalent arsenic [As(III)], pentavalent arsenic [As(IV)] monomethyl arsenic (MMA) and dimethyl arsenic (DMA); the detection limit of the method is in a range of 0.6 to 1 [mu]g / L; the precision degrees of As(III), DMA, MMA and As(IV) are 1.26%, 1.24%, 1.00% and 0.79%, respectively; and obvious conversion among the four arsenic forms does not occur during determination.

Description

technical field [0001] The invention discloses a method for detecting air pollutants, and in particular discloses a separation and determination method for detecting arsenic in PM2.5. Background technique [0002] Arsenic is a metalloid element widely present in the environment, and its average concentration in the earth's crust is 4.8±0.5 mg kg -1 . There are two main sources of arsenic in the environment: natural pathways and human activities. Volcanic eruptions are the main natural source of arsenic. The burning of fossil fuels, metal smelting and the use of arsenic-containing herbicides are the main anthropogenic sources of arsenic in the global atmosphere. Arsenic exists in the environment in the form of many different compounds. The physicochemical properties of different forms of arsenic compounds are different. It is generally believed that the toxicity of inorganic arsenic is stronger than that of organic arsenic, and the toxicity of As(III) is much greater than t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/02
CPCG01N30/02G01N2030/027
Inventor 尹西翔王利红于雄军栾玲玉韩术鑫
Owner 济南市环境保护科学研究院
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