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Simple measuring method for trace arsenic in atmosphere

A determination method and technology for trace arsenic, applied in chemical instruments and methods, measuring devices, material analysis by observing the effect on chemical indicators, etc., to achieve the effect of reducing hazards, loose and uniform structure, and small air resistance

Inactive Publication Date: 2019-01-08
TIANJIN GUANGFU TECH DEV
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Problems solved by technology

[0010] Aiming at the current technical requirements and current situation of environmental protection for the determination of trace arsenic in the air, the present invention proposes a simple method for the determination of trace arsenic in the atmosphere with convenient operation, high sensitivity and less secondary pollution

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  • Simple measuring method for trace arsenic in atmosphere

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[0038] The content of the invention of the present application will be further described in detail below in conjunction with specific examples. The following examples are only descriptive, not restrictive, and cannot limit the protection scope of the present invention.

[0039] A kind of simple and easy determination method of trace arsenic in atmosphere, comprises the following steps:

[0040] ⑴Atmospheric sampling: using Na 2 CO 3 - Glycerin impregnated filter membrane with a flow rate of 100L / min, collected for 10-15h;

[0041] (2) Digestion: remove the filter membrane, put it into the arsenic fixer, add HNO 3 -H 2 SO 4 Mix acid, heat to 50-60°C for 20 minutes, stop heating, cool to obtain 10ml of liquid;

[0042] (3) Reduction color development: Put a piece of potassium borohydride tablet into the above-mentioned arsenic detector, quickly install the mercury bromide test paper, shake it horizontally until the tablet is completely dissolved, and then let it stand for 1...

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Abstract

The invention relates to a simple measuring method for trace arsenic in atmosphere. The method comprises the following steps: (1) atmospheric sampling: a Na2CO3-glycerin impregnated filter membrane isadopted for collection at the flow of 100 L / min for 10-15 h; (2) digestion: the filter membrane is taken down and placed into an arsenic determining device, HNO3-H2SO4 mixed acid is added, the mixture is heated to 50-60 DEG C for 20 min, and cooling is performed after heating; (3) reducing color development: potassium borohydride is sliced and placed into the arsenic determining device, and aftera mercury bromide test strip is rapidly loaded, the arsenic determining device is horizontally shaken until the slices are completely dissolved and left to stand for 15 min; (4) color comparison. According to the provided measuring method, sample digestion, reduction and measurement are integrated after enrichment, so that original complicated operation links such as digestion, evaporation, acidremoval, evaporation to dryness, dissolution, filtering, volume fixing and the like for samples are omitted, secondary pollution is reduced, and harm to an operator is reduced.

Description

technical field [0001] The invention belongs to the field of environmental detection, in particular to a simple method for determining trace arsenic in the atmosphere. Background technique [0002] At present, arsenic is listed as a harmful element under key supervision, whether it is in food hygiene or in the air of bad environment. Due to the extensive use of arsenic in industry and agriculture, arsenic with different concentrations is widely distributed in water, soil and air. Therefore, it is necessary to establish a simple, fast and accurate method to determine arsenic. [0003] At present, the determination methods of arsenic in ambient air include atomic absorption method, atomic fluorescence method, polarography, emission spectrometry, arsenic reagent (silver diethyldithiocarbamate) photometry, etc., because the content of arsenic in ambient air is very high. In 2012, the Ministry of Environmental Protection promulgated the new national standard "Ambient Air Qualit...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78G01N1/22B01D71/16B01D71/06B01D71/02B01D67/00
CPCB01D67/0079B01D71/02B01D71/06B01D71/16G01N1/2205G01N1/2247G01N21/783G01N2021/7759
Inventor 张巍张勇贾伟青
Owner TIANJIN GUANGFU TECH DEV
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