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A method for speciation analysis of heavy metals in atmospheric particulates

A technology for analysis of atmospheric particles and speciation, applied in the fields of material analysis, thermal excitation analysis, material excitation analysis, etc., can solve the problems of lack of research on heavy metals, and achieve the effect of easy acquisition and few extraction steps

Active Publication Date: 2022-08-02
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

There is still a lack of research on the speciation analysis of heavy metals in atmospheric particulate matter

Method used

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  • A method for speciation analysis of heavy metals in atmospheric particulates

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Embodiment 1

[0023] Obtain a certain number of quartz filter membrane samples collected with atmospheric particulate matter and heavy metals from the long-term sampling monitoring site of atmospheric particulate matter, record the sampling number, wrap it in tinfoil and put it in a desiccator for storage for testing. During the experimental extraction, take out a certain number of quartz filter membrane samples from the desiccator, and complete the following steps one by one:

[0024] Step 1) Pre-treatment, first record the sampling number of the quartz filter and assign it the corresponding extraction operation sequence number, and then use a paper cutter with a scale and enamel scissors to cut 2cm 2 The filter membrane is put into an electronic analytical balance with an accuracy of 1 / 10,000 gram for weighing, and the quality of the filter membrane is recorded. Finally, the cut filter membrane is put into a 50mL centrifuge tube, and the outer wall of the centrifuge tube is pasted with the...

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Abstract

The invention discloses a method for morphological analysis of heavy metals in atmospheric particles, comprising the following steps: (1) pretreatment; (2) extraction of water-soluble heavy metal samples; (3) extraction of reducible heavy metal samples; Extraction of oxidized heavy metal samples; (5) extraction of residual heavy metal samples; (6) determination of the concentration of heavy metals in the samples extracted by the above steps; (7) according to the formula to convert the concentration of various forms of heavy metals in atmospheric particles, the formula is: C =C 0 R D V sol S ∑ / (V gas S), where C 0 For the instrument to measure the concentration of heavy metals in the liquid sample, R D is the dilution factor, V sol is the volume of the solution, S ∑ is the total area of ​​the filter membrane, V gas is the sampled gas volume, and S is the area of ​​the clipped filter membrane. The method of the invention has a high extraction ratio for heavy metals in atmospheric particles, has few extraction steps, can accurately extract heavy metals in different forms step by step, and can provide a theoretical basis for environmental risk assessment of heavy metals in atmospheric particles.

Description

technical field [0001] The invention belongs to the technical field of environmental protection chemical industry, and particularly relates to a method for analyzing the form of heavy metals in atmospheric particles. Background technique [0002] In recent years, air pollution has become increasingly serious, haze weather occurs frequently, and atmospheric particulate matter is easily enriched with harmful heavy metals such as lead, chromium, and cadmium on its surface, and enters the human body through respiration and other means, which seriously threatens human health. focus on. In addition to its total content, the harmfulness of heavy metals in atmospheric particulates to human health is also affected by their bioavailability, and the bioavailability of heavy metals depends on their occurrence forms. However, most of the current research focuses on the analysis of the total amount of heavy metals in atmospheric particulates. The premise of this analysis is based on the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/00G01N21/73G01N27/626G01N21/31G01N1/28
CPCG01N15/00G01N21/73G01N27/62G01N21/3103G01N1/28
Inventor 王雨轩孙明洋于江华
Owner NANJING UNIV OF INFORMATION SCI & TECH
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