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Method for detecting multiple haloacetic acids in air or exhaust gas

A detection method and haloacetic acid technology are applied in the detection field of various haloacetic acids, and can solve the problems such as inability to apply waste gas measurement, lack of haloacetic acid detection methods, etc.

Active Publication Date: 2017-08-18
肖洋
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is currently a lack of detection methods for various haloacetic acids in air and exhaust gas.
Shao Shengwen et al. reported the gas chromatographic determination method of monochloroacetic acid in the air of the workplace, and discussed the gas chromatography conditions, sample collection and processing methods, but it was limited to monochloroacetic acid, and could only measure ambient air, not suitable for waste gas determination. The determination of the other eight haloacetic acids has not been reported in
There are almost no reports on the determination method of haloacetic acid in exhaust gas

Method used

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  • Method for detecting multiple haloacetic acids in air or exhaust gas

Examples

Experimental program
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Effect test

Embodiment 1

[0070] The haloacetic acid compounds in the exhaust gas of fixed pollution sources are absorbed and collected by connecting two porous glass plate absorption bottles each equipped with 0.1mol / L NaOH aqueous solution with a volume of 40ml in series. Connect the series-connected porous glass plate absorption bottle to the flue gas sampler, set the gas collection flow rate to 0.5L / min to collect the waste gas from pollution sources for 40min, and collect 20L of gas samples.

[0071] Add nine haloacetic acid standard substances to 0.1mol / L NaOH aqueous solution to prepare 40ml of standard substances with concentrations of 0.5μg / L, 1μg / L, 5μg / L, 10μg / L, 20μg / L, 50μg / L, 100μg / L L, 200μg / L, 1000μg / L, 2000μg / L nine haloacetic acid standard alkaline aqueous solutions. Add 2ml of concentrated sulfuric acid to the above alkaline aqueous solution to adjust the pH to less than 0.5, convert the haloacetate into haloacetic acid, then quickly add 8g of baked sodium chloride to shake and disso...

Embodiment 2

[0096] The haloacetic acid compounds in the exhaust gas of fixed pollution sources are absorbed and collected by connecting two porous glass plate absorption bottles each equipped with 0.5mol / L NaOH aqueous solution with a volume of 40ml in series. Connect the series-connected porous glass plate absorption bottle to the flue gas sampler, set the gas collection flow rate to 0.4L / min to collect the waste gas from pollution sources for 50min, and collect 20L of samples. After sampling, follow the same sample analysis steps as in Example 1 to analyze and calculate the concentrations of the nine kinds of haloacetic acids in the exhaust gas from the exhaust pipe of the fixed pollution source. The metal catalyst used in the drawing of the working curve and the determination of the samples to be tested is ferric sulfate, and the addition amount is 8 mg; and 6 ppm of p-chlorotetraphenylcopper porphyrin and 0.8 mg of benzenesulfonic acid phenolic resin (PAFR) are added in the mass of the...

Embodiment 3

[0099] The haloacetic acid compounds in the exhaust gas of fixed pollution sources are absorbed and collected with a single porous glass plate absorption bottle filled with a volume of 40ml of 1mol / L NaOH aqueous solution. Connect the porous glass plate absorption bottle to the flue gas sampler, set the gas sampling flow rate to 0.4L / min to collect the waste gas from pollution sources for 50min, and collect 20L of gas samples. After sampling, follow the same sample analysis steps as in Example 1 to analyze and calculate the concentrations of nine kinds of haloacetic acids in the waste gas from fixed pollution sources. The working curve drawing and the metal catalyst ferric chloride addition amount used for the determination of the sample to be tested are 7mg; The content of chlorotetraphenylcopper porphyrin is 5ppm of the mass of the carrier solvent.

[0100] The measurement results of haloacetic acid in exhaust gas are as follows: monochloroacetic acid 0.1593mg / m 3 , Monobr...

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Abstract

The invention belongs to the technical field of environment detection and particularly relates to a method for detecting multiple haloacetic acids in air or an exhaust gas. The method comprises the steps of absorbing and sampling the haloacetic acids in the air or the exhaust gas through a porous glass plate absorption bottle containing a NaOH water solution or ultrapure water; extracting the haloacetic acids through methyl tertiary-butyl ether containing an internal standard substance and carrying out esterification reaction on methyl alcohol by adopting the methyl tertiary-butyl ether as a carrier solvent under composite catalysis of a metal catalyst, metalloporphyrin and phenylsulfonate phenolic resin; and measuring the peak area by using a gas chromatograph with an electron capture device and carrying out result measurement. One-off, comprehensive, fast and simultaneous measurement of the multiple haloacetic acids in the air or the exhaust gas is achieved, and the measurement method is high in precision, good in accuracy and low in detection limit.

Description

technical field [0001] The invention belongs to the technical field of environmental detection, and in particular relates to a method for detecting multiple haloacetic acids in air or waste gas. Background technique [0002] Haloacetic acid (HAAs) is an important intermediate in the preparation of organic synthetic chemicals and pesticides. It has a wide range of applications and mainly includes nine kinds: monochloroacetic acid, monobromoacetic acid, dichloroacetic acid, trichloroacetic Dichloroacetic acid, dibromoacetic acid, monochlorodibromoacetic acid, tribromoacetic acid, and haloacetic acid are carcinogenic, teratogenic, and deformable to the human body. However, there is currently a lack of detection methods for various haloacetic acids in air and exhaust gas. Shao Shengwen et al. reported the gas chromatographic determination method of monochloroacetic acid in the air of the workplace, and discussed the gas chromatography conditions, sample collection and processin...

Claims

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Application Information

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IPC IPC(8): G01N30/06G01N30/70
CPCG01N30/06G01N30/70
Inventor 肖洋王新娟韩超韩伟
Owner 肖洋
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