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A Gas Chromatographic Method for the Determination of Nine Trace Amounts of Haloacetic Acids in Bottled Drinking Water
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A technology for gas chromatography and drinking water, which is applied in the field of analysis and detection of harmful trace substances, and can solve the problems of small variety of solid-phase extraction products and a lot of time consumption.
Active Publication Date: 2021-05-14
丁立平 +1
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[0006] In order to overcome the defect that the liquid-liquid extraction method that exists in the pre-treatment of nine kinds of trace haloacetic acids in bottled drinking water needs to use a large amount of organic solvents; Insufficiency of consuming a lot of time, the technical problem to be solved by the present invention is to provide a gas chromatography method based on the rapid adsorption of novel adsorbent dispersion solid phase extraction, which is suitable for the detection of nine kinds of trace haloacetic acids in bottled drinking water
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Embodiment 1
[0072] In Example 1, the barreled natural drinking water sample of Fuqing Lingshi Valley was used as the sample matrix to carry out the standard addition recovery experiment to verify the feasibility of the method of the present invention, and the treatment was carried out according to the following steps:
[0073] 1. Adsorption of compounds:
[0074] Add 200mL of water sample to a 500mL separatory funnel, and add 5.00mL of nine compound standard solutions with concentrations of 10.0μg / L, 20.0μg / L and 200.0μg / L to prepare three levels, Each level has six samples, then add 0.40g of hydroxymethanesulfonate-magnesium aluminum hydrotalcite adsorbent, and shake for 15min to make the adsorbent adsorb;
[0075] 2. Desorption of compounds:
[0076] Add the water in the separatory funnel to a 50mL stoppered centrifuge tube and centrifuge at 4500rpm for 3min to separate the solid adsorbent from the aqueous solution and discard the supernatant, combine all the lower solid adsorbents int...
Embodiment 2
[0085] In Example 2, the bottled mineral water of Shibachongxi in Fuqing was used as the sample matrix to carry out the standard addition recovery experiment to verify the feasibility of the method of the present invention, and to process according to the following steps:
[0086] 1. Adsorption of compounds:
[0087] Add 200mL of water sample to a 500mL separatory funnel, and add 5.00mL of nine compound standard solutions with concentrations of 10.0μg / L, 20.0μg / L and 200.0μg / L to prepare three levels, Each level has six samples, then add 0.40g of hydroxymethanesulfonate-magnesium aluminum hydrotalcite adsorbent, and shake for 15min to make the adsorbent adsorb;
[0088] 2. Desorption of compounds:
[0089] Add the water in the separatory funnel to a 50mL stoppered centrifuge tube and centrifuge at 4500rpm for 3min to separate the solid adsorbent from the aqueous solution and discard the supernatant, combine all the lower solid adsorbents into a centrifuge tube, and pour Add ...
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Abstract
The invention relates to a method for analyzing and detecting trace harmful substances, in particular to a gas chromatography method for measuring nine kinds of trace haloacetic acids such as monochloroacetic acid, dichloroacetic acid and trichloroacetic acid in bottled drinking water. The steps of the method include using a novel adsorbent methoxide-magnesium-aluminum hydrotalcite to quickly enrich the target compound in bottled water by means of dispersive solid-phase extraction, using an acid-dissolved adsorbent to achieve complete elution of the target compound, and using a small dose of organic Compounds are efficiently extracted by solvents and rapidly analyzed by gas chromatography after derivatization. The new adsorbent used in this method adopts the method of dispersed solid phase extraction to achieve fast and efficient adsorption of the target substance, which can save a lot of adsorption time compared with the method of solid phase extraction; the application of acid-soluble adsorbent can realize the complete removal of the target substance. Adsorption; only suitable for a small amount of organic solvent extraction, compared with the liquid-liquid extraction method that requires the use of a large amount of organic solvents, it has significant safety, environmental and economic advantages.
Description
technical field [0001] The invention relates to a method for analyzing and detecting harmful trace substances, in particular to a gas chromatography method for simultaneously measuring nine kinds of trace haloacetic acids in bottled drinking water. Background technique [0002] Chlorination disinfection is a widely used and long-term drinking water disinfection method in the world. This method can better kill harmful pathogenic microorganisms in drinking water, and has played a major role in improving drinking water quality and ensuring drinking water safety. effect. However, the use of chlorination disinfection will cause safety problems of residual disinfection by-products in drinking water. Among them, haloacetic acid disinfection by-product residues (HAAs) are a class of strong carcinogens. Long-term drinking of drinking water containing traces of HAAs will greatly increase the risk of human cancer. Therefore, the detection and monitoring of HAAs in drinking water has ...
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