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Method capable of determining nine haloacetic acids in air or waste gas at the same time in one time

A haloacetic acid, one-time technology, applied in the field of environmental testing, can solve problems such as inapplicable exhaust gas measurement, achieve the effects of improving test accuracy, avoiding corrosion, and improving work efficiency

Active Publication Date: 2017-05-10
肖洋
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Shao Shengwen reported the gas chromatography determination method of monochloroacetic acid in the workplace air, and discussed the gas chromatography conditions, sample collection and processing methods, but only limited to monochloroacetic acid, and can only measure ambient air, not suitable for waste gas determination
Determination of other eight haloacetic acids in air and exhaust gas has not been reported

Method used

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  • Method capable of determining nine haloacetic acids in air or waste gas at the same time in one time

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Use a single adsorption tube (200mg at the front and 100mg at the end) filled with silica gel to absorb and collect haloacetic acid compounds in the ambient air, open both ends of the adsorption tube at the sampling site, connect the adsorption tube to the atmospheric sampler, and set the gas sampling flow rate Ambient air was collected at 1 L / min for 20 min. After sampling, put plastic caps on both ends of the adsorption tube.

[0068] The concentration is 0.001mg / m3 prepared by diffusion dynamic gas distribution method 3 , 0.002mg / m 3 , 0.01mg / m 3 , 0.02mg / m 3 , 0.04mg / m 3 , 0.1mg / m 3 , 0.2mg / m 3 , 0.4mg / m 3 , 1.0mg / m 3 , 4.0mg / m 3 Nine haloacetic acid standard samples pass through the two-stage adsorption tube at a certain gas recovery rate. Pour the two sections of packing at the front and back of the adsorption tube into a stoppered test tube, add 5mL of water as a desorption reagent, cover the bottle with a stopper, and put it into an ultrasonic instrume...

Embodiment 2

[0077] Use an adsorption tube (200 mg at the front end and 100 mg at the end) equipped with silica gel filler to adsorb and collect the haloacetic acid compounds in the exhaust gas of the exhaust pipe of the pollution source. The gas flow rate is 0.4L / min, and the exhaust gas from pollution sources is collected for 50 minutes. After sampling, according to the sample analysis steps in Example 1, analyze and calculate the concentration of nine kinds of haloacetic acids in the exhaust gas of the pollution source exhaust pipe. The metal catalyst used for the drawing of the working curve and the determination of the samples to be tested is copper chloride, and the addition amount is 0.8 mg; and 0.1 ppm of tetraphenyliron porphyrin and 2 mg of benzenesulfonate phenolic resin (PAFR) are added.

[0078] The measurement results are as follows: monochloroacetic acid 0.3462mg / m 3 , monobromoacetic acid 0.2073mg / m 3 , dichloroacetic acid 0.1431mg / m 3 , Trichloroacetic acid 0.2315mg / m ...

Embodiment 3

[0080] Use an adsorption tube (200 mg at the front end and 100 mg at the end) equipped with silica gel filler to adsorb and collect haloacetic acid compounds in the air of the production workshop, open both ends of the adsorption tube at the sampling site, connect the adsorption tube to the atmospheric sampler, and set the gas sampling flow rate to Collect workshop air at 0.5L / min for 40 minutes. After sampling, according to the sample analysis steps in Example 1, analyze and calculate the concentrations of the nine kinds of haloacetic acids in the air of the production workshop. The metal catalyst used for the drawing of the working curve and the determination of the samples to be tested is ferric chloride, and the addition amount is 10 mg; and 6 ppm of p-chlorotetraphenylcopper porphyrin and 0.4 mg of benzenesulfonate phenolic resin (PAFR) are added.

[0081] The measurement results are as follows: monochloroacetic acid 0.0321mg / m 3 , Monobromoacetic acid 0.0213mg / m 3 , di...

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Abstract

The invention belongs to the technical field of environment detection and particularly relates to a method capable of determining nine haloacetic acids in air or waste gas at the same time in one time. According to the method, the haloacetic acids in the air or the waste gas are sampled through an adsorption tube filled with filler, water is utilized as a desorption regent, the haloacetic acids adsorbed by the filler in the adsorption tube is desorbed and transferred into water, then methyl tertiary butyl ether containing an internal standard substance is used for extracting, the methyl tertiary butyl ether is utilized as a carrier solvent to generate esterification reaction with methyl alcohol, and a peak area is determined through a gas chromatograph with an electronic catcher to perform result determination. The method has the advantages of high accuracy, low detection limit and good determined result repeatability.

Description

technical field [0001] The invention belongs to the technical field of environmental detection, and in particular relates to a method for simultaneously measuring nine kinds of haloacetic acids in air or waste gas at one time. Background technique [0002] Haloacetic acids (HAAs) are important intermediates for the preparation of pesticides and organic synthesis, and are widely used, mainly including nine kinds: monochloroacetic acid, monobromoacetic acid, dichloroacetic acid, trichloroacetic acid, monobromochloroacetic acid, monobromoacetic acid Dichloroacetic acid, dibromoacetic acid, monochlorodibromoacetic acid, tribromoacetic acid. Haloacetic acids have carcinogenic, teratogenic, and deformable effects on the human body, which have attracted the attention of scholars. At present, the determination of haloacetic acids is limited to water quality analysis, and there is a lack of detection methods for various haloacetic acids in air and exhaust gas. The methods reported ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02
CPCG01N30/02G01N2030/025
Inventor 肖洋王新娟韩超韩伟
Owner 肖洋
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