Method for accurately quantifying 1,1-dichloroacetone and 1,1,1-trichloroacetone in water

A technology of dichloroacetone and trichloroacetone, applied in the field of environmental engineering, achieves the effects of optimizing instrument conditions, avoiding interference, and increasing sample cost

Inactive Publication Date: 2012-06-27
TONGJI UNIV
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  • Application Information

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Problems solved by technology

[0004] Aiming at the problem that the prior art cannot accurately measure 1,1-dichloroacetone (DCAce) and 1,1,1-trichloroacetone (TCAce) in drinking water (tap water) after chlorination disinfection, the purpose of the invention is to provide a A method for accurately quantifying 1,1-dichloroacetone and 1,1,1-trichloroacetone in water, which is simple, fast and efficient, and is not interfered by other substances with properties similar to CAces

Method used

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  • Method for accurately quantifying 1,1-dichloroacetone and 1,1,1-trichloroacetone in water
  • Method for accurately quantifying 1,1-dichloroacetone and 1,1,1-trichloroacetone in water
  • Method for accurately quantifying 1,1-dichloroacetone and 1,1,1-trichloroacetone in water

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Embodiment 1

[0031] figure 2 Represent the schematic flow sheet of the inventive method, below in conjunction with figure 2 Be explained.

[0032] 1 Sample pretreatment

[0033] 1.1 Selection of extractant

[0034] Firstly, the tap water samples were pretreated (see "1.2 DCAce and TCAce Stabilization Pretreatment", and then 4g of anhydrous sodium sulfate was added to the test tube containing 20mL of pretreated water samples, and manually shaken for 1min, so that no Sodium sulfate in water is fully dissolved, and the liquid level of the water sample rises. Then add 2mL of a certain extractant (examine different extractants, including n-pentane, n-hexane, methyl tert-butyl ether and ethyl acetate). The middle liquid level rises slightly, shake vigorously by hand for 5 minutes, let it stand for 10 minutes, extract the upper extractant solution, and perform GC / MS determination. image 3 Schematic representation of the extraction procedure. Through this experiment, it is found that compare...

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Abstract

The invention, belonging to the field of environment engineering, discloses a method for accurately quantifying 1,1-dichloroacetone and 1,1,1-trichloroacetone in water. The method comprises the following steps: pretreating a water sample: selecting methyl tertiary butyl ether as an extractant, regulating the pH value of the water sample to 4-6, and using ascorbic acid as a dechlorination reagent to stabilize 1,1-dichloroacetone and 1,1,1-trichloroacetone in the water sample; optimizing instrument conditions, wherein the optimized instrument sample size is 3 mu L, and the introduction port temperature is 110 DEG C; and measuring the content of 1,1-dichloroacetone and 1,1,1-trichloroacetone in the water sample: firstly establishing a standard curve, then measuring and calculating the content of 1,1-dichloroacetone and 1,1,1-trichloroacetone, and finally verifying the reliability of the method. The method is simple, rapid and efficient without interference from other substances which are similar to CAces in property.

Description

technical field [0001] The invention belongs to the field of environmental engineering and relates to a method for accurately quantifying 1,1-dichloroacetone and 1,1,1-trichloroacetone in water. Background technique [0002] Trihalomethanes (THMs) are the earliest discovered drinking water disinfection by-products (disinfection by-products, DBPs) with carcinogenic, teratogenic and mutagenic effects (Bellar T A, Lichtenberg J J, Kroner R C.The occurrence of organohalides in chlorinated drinking waters. Journal of the American WaterWorks Association, 66(12):703-706). As early as the 1970s, the National Cancer Society of the United States found that THMs have carcinogenic effects on animals (National Cancer Institute Report on Carcinogenesis Bioassay of Chloroform, Carcinogenesis Program[R]. Division of Cancer Cause and Prevention, Bethesda, MD, Mar 1976). Coupled with the aggravation of water source water pollution in recent years (Chu Wenhai, Gao Naiyun, et al. Research on e...

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Application Information

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IPC IPC(8): G01N30/88G01N30/06
Inventor 楚文海高乃云尹大强安娜谢茴茴蒋金杨帆
Owner TONGJI UNIV
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