Method for detecting arsenic content in water body

A detection method and water body technology, applied in the field of chemical detection, can solve the problems of environmental toxicity, high toxicity of reagents, difficult to handle, etc., and achieve the effect of effective removal

Active Publication Date: 2012-09-12
LIHE TECH (HUNAN) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has two main disadvantages: ① not only the unobstructed air, but also the full contact of hydrogen sulfide air and lead acetate cotton must be considered, and the tightness of the lead acetate cotton is difficult to adjust; ② the lead sulfide waste produced in the experiment...

Method used

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  • Method for detecting arsenic content in water body
  • Method for detecting arsenic content in water body
  • Method for detecting arsenic content in water body

Examples

Experimental program
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Effect test

Embodiment 1

[0062] Samples are tested as follows:

[0063] ①Sample preparation:

[0064] Prepare 0mg / L As (deionized water), 5mg / L H 2 S, (5mg / L H 2 S+20ug / L As) samples, each sample is divided into two sub-samples, each sub-sample is 100mL, one part is taken from each sub-sample and compiled into group A, and the rest is group B.

[0065] ②Reaction and measurement: a. Put the sample in the reaction pool, add 5mL (20% sulfuric acid-10% tartaric acid) solution;

[0066] b. Group A samples are blown at a flow rate of 0.3L / min, heated to 80°C, and maintained for 5 minutes, and the tail gas is passed into the tail gas treatment device. Group B samples were mixed directly;

[0067] c. Add 5ml of absorption solution (same as GB11900-89) to the absorption tube, slowly add 5mL of 10% potassium borohydride solution into the reaction tank, blow air at a flow rate of 0.3L / min while adding, and react for 5min;

[0068] d. Measure the absorbance of the absorbing solution after color development w...

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Abstract

The invention provides a method for detecting an arsenic content in a water body. The method comprises the following steps of: a) providing a sample to be detected, and mixing protonic acid with the sample to be detected containing hydrogen sulfide, so that the protonic acid and sulfide in the sample to be detected are reacted to generate the hydrogen sulfide; b) introducing air into the sample to be detected containing hydrogen sulfide, and removing hydrogen sulfide; c) mixing a reducing agent with the sample to be detected, so that an arsenious compound is reduced to be arsenic hydride; and d) absorbing arsenic hydride by using an absorbent and carrying out chromogenic reaction, detecting developed liquid through a spectrophotometry, and obtaining content of an arsenic element in the water body through calculation. The detection method provided by the invention not only can be used for effectively removing sulfide interference but also is environmentally-friendly and easy to operate. The invention further provides a device for detecting the arsenic content in the water body.

Description

technical field [0001] The invention relates to the field of chemical detection and specifically designs a method for detecting arsenic content in water bodies. Background technique [0002] Arsenic is a ubiquitous pollutant in water bodies, and the World Health Organization believes that long-term drinking of water containing more than 10 milligrams of arsenic per liter can lead to arsenic poisoning, a chronic disease that causes skin disorders, gangrene and cancer of the kidney and bladder . Arsenic in water is usually present in the form of arsenate and arsenite. Since arsenic and phosphorus are in the same family and have similar properties, the direct analysis of arsenic is greatly interfered by phosphorus. The most effective method is to reduce arsenic to arsine hydrogen (AsH 3 ) to be separated, generally using potassium borohydride or zinc as reducing agent, taking trivalent arsenic as an example, the reaction is as follows: [0003] As 3+ +3Zn+6H + →2AsH 3 +3Z...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N1/34G01N1/44
Inventor 童设华邹雄伟文立群申田田刘智峰
Owner LIHE TECH (HUNAN) CO LTD
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