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Rapid digestion and enrichment measurement method of trace arsenic in soil

A determination method, a technology of trace arsenic, which is applied in the direction of measuring devices, preparation of test samples, and material analysis by observing the impact on chemical indicators, etc., to achieve the effects of reducing costs, saving time, and improving sensitivity

Inactive Publication Date: 2019-07-16
TIANJIN GUANGFU TECH DEV
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  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art, aiming at the requirements and current situation of environmental protection on the enrichment and separation of heavy metal arsenic, we propose a rapid digestion and enrichment assay method for trace arsenic in soil

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  • Rapid digestion and enrichment measurement method of trace arsenic in soil
  • Rapid digestion and enrichment measurement method of trace arsenic in soil

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Embodiment Construction

[0040] The present invention will be described in further detail below with reference to the drawings and specific embodiments. The following embodiments are only descriptive and not restrictive, and the protection scope of the present invention cannot be limited by this.

[0041] A rapid digestion and enrichment determination method for trace arsenic in soil, the steps are as follows:

[0042] 1. Preparation of digestion agent (aqua regia)

[0043] HNO 3 :HCL=1:3, mix evenly under cooling, then slowly pour into water and stir, dilute to double.

[0044] 2. Preparation of reducing agent

[0045] ① Dissolve 0.2g KOH with a small amount of water to obtain KOH solution.

[0046] ②Add 0.1g potassium borohydride to the above KOH solution and dilute with water to 100ml (this solution needs to be used and prepared)

[0047] 3. Refer to the method for determination of trace lead in water by sulfhydryl paper enrichment and separation colorimetric method disclosed in invention patent CN109060792A. ...

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Abstract

The invention relates to a rapid digestion and enrichment measurement method of trace arsenic in soil. The method comprises the following steps: (1) preparation of a digestion solution; (2) preparation of a reducing agent; (3) preparation of sulfhydryl paper; (4) preparation of a soil digestion solution enrichment device; (5) soil digestion; (6) sulfhydryl paper enrichment; and (7) measurement: 1) mounting a circular piece of mercury bromide test paper in a main bottleneck cover of an arsenic determinator; 2) inserting a reverse rubber plug in a branch bottleneck of the arsenic determinator;3) placing the enriched sulfhydryl paper in the arsenic determinator, and covering the main bottleneck cover; 4) injecting concentrated hydrochloric acid from the rubber plug of the branch bottleneck;5) heating the arsenic determinator in a water bath of 50-55 DEG C for 5min, and shaking the arsenic determinator from time to time; 6) taking out the arsenic determinator, injecting a reducing agentsolution from the rubber plug of the branch bottleneck, and placing for 30min; and 7) taking out the mercury bromide test paper, and performing color comparison with a standard color palette to determine the arsenic content in the sample. No large instrument is used in the whole measurement process, the operation can be performed in ordinary laboratories and by individuals, and the rapid digestion and enrichment measurement method is particularly suitable for the early warning and prompting of arsenic contamination in the soil.

Description

Technical field [0001] The invention belongs to the field of environmental protection heavy metal separation and enrichment detection, in particular to a rapid digestion and enrichment determination method of trace arsenic in soil. Background technique [0002] With the improvement of people's living standards, the demand for pollution-free, safe, high-quality, and nutritious food is increasing day by day, and pollution-free environmental conditions are the guarantee of safety. The monitoring of environmental conditions is also a necessary condition for environmental safety. The determination of trace arsenic is one of the main environmental monitoring items. Arsenic compounds (especially inorganic arsenic) are highly toxic. If the intake exceeds the excretion, arsenic will accumulate in most organs of the human body, causing arsenic poisoning. Once soil is contaminated by arsenic, it is difficult to eliminate it, and it can cause harm, disease, and death to humans through the ...

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Application Information

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IPC IPC(8): G01N1/40G01N1/44G01N21/78
CPCG01N1/4044G01N1/4055G01N1/44G01N21/78
Inventor 张勇张贵珠张文雯王媛
Owner TIANJIN GUANGFU TECH DEV
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