Method for analyzing and discriminating odorous substances in drinking water

A discrimination method, a drinking water technology, applied in the analysis of materials, testing water, material separation, etc., can solve the problems of complex operation, large sample demand, low sensitivity, etc., and achieve wide application prospects, low consumption, and simple operation. Effect

Active Publication Date: 2015-02-18
INFINITUS (CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] The key to the analysis of smell and taste substances in water is the enrichment of smell and taste. The commonly used enrichment methods are solid phase extraction (SPE), distillation extraction (SDE), purge and trap (P&T), and distillation extraction (SDE). , closed loop purging method (CLSA), liquid-liquid extraction method, etc. These pretreatment methods have their own disadvantages, such as large sample requirements, organic solvent consumption, complicated operation, low sensitivity, and difficulty in detecting trace amounts (ng / L Grade) organic compounds, etc., after using the above-mentioned method to extract the odorous substances, after subsequent gas chromatography-mass spectrometry and other instrument analysis, the accuracy of the detection results is difficult to guarantee
[0017] Therefore, in the current extraction method of odorous substances in drinking water in the prior art, a large amount of samples is required, a large amount of organic solvent is consumed, the operation is complicated, the sensitivity is low, it is difficult to detect trace organic compounds, and there are human errors in the sensory analysis method in the water quality analysis method , gas chromatography-mass spectrometry instrument analysis method is difficult to lock the odor in drinking water, gas chromatography-sniffing method, especially gas chromatography-mass spectrometry-sniffing method, has not been applied to the analysis and detection of odor in drinking water, so , how to more accurately identify the odor in drinking water requires further research

Method used

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  • Method for analyzing and discriminating odorous substances in drinking water
  • Method for analyzing and discriminating odorous substances in drinking water
  • Method for analyzing and discriminating odorous substances in drinking water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Example 1 Determination of odorous substances in drinking water in a certain place in the south (1) and sensory analysis verification

[0055] In order to strengthen the management of drinking water quality, eliminate the problem of drinking water odor complaints from consumers, and ensure the quality of drinking water is stable and controllable. The volatile components in drinking water were extracted by solid-phase microextraction, and then the key odorants were qualitatively and quantitatively analyzed by gas chromatography-smell-mass spectrometry.

[0056] 1. Materials

[0057] (1) sample

[0058] Somewhere in the South (1) Drinking water sample.

[0059] (2) Reagents and instruments

[0060] Among the standard reference compounds, except for tribromomethane, pyridine, triethylamine, camphorone and 2,4,5-trimethylthiazole which were purchased from Sinopharm Chemical Reagent Co., Ltd., other reagents were purchased from Sigma-Aldrich Company in the United States. ...

Embodiment 2

[0084] Example 2 Determination of odorous substances in drinking water in a certain place in the north (1) and sensory analysis verification

[0085] 1. Instruments and methods used

[0086] Except that the sample is a drinking water sample in a certain place (1) in the north, other parts are the same as the method used in Example 1, and GC-MS can be used to detect odorous substances in the water sample, and the total ion chromatogram (TIC) results are as follows: figure 2 As shown in , a total of 13 kinds of odorous substances were detected, including triethylamine (Triethylamine), dibromochloromethane (Dibromochloromethane), 2,4,5-trimethylthiazole (2 , 4,5-Trimethyl-thiazole), etc., wherein the odor characteristics of 13 peculiar smell substances and their contents in water samples are shown in Table 3 below.

[0087] Table 3 Odor substances in drinking water samples in a certain place in the north (1)

[0088]

[0089]2. The precision experiment mainly examines the p...

Embodiment 3

[0100] Example 3 Determination of odorous substances in drinking water in a certain place in the north (2) and sensory analysis verification

[0101] 1. Instruments and methods used:

[0102] The same as the instrument detection method used in Example 1, the sample is a drinking water sample from a certain place in the north (2), and the odorous substances in the water sample can be detected by GC-MS. The results of the total ion chromatogram (TIC) are as follows: image 3 As shown in Table 5, each odorous substance and its content are shown in Table 5.

[0103] Table 5 Odor substances in (2) drinking water samples in a certain place in the north

[0104]

[0105] 2. The precision experiment mainly examines the precision of the instrument. The same drinking water sample was taken, prepared according to the above pretreatment method and sample preparation method, and injected continuously for 3 times. The consistency of the relative content of odorants obtained by using ...

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Abstract

The invention discloses a method for analyzing and discriminating odorous substances in drinking water. The method comprises the following steps: (1) extracting volatile substances in the drinking water by a solid phase microextraction technology; (2) performing gas chromatography-olfaction-mass spectrometry (GC-O-MS) analysis on the volatile substances in the drinking water, and qualitatively and quantitatively discriminating the odorous substances; (3) preparing simulated water sample from the discriminated odorous substances and ultrapure water by stimulating the drinking water, performing sensory analysis on the simulated water sample and the drinking water, evaluating the simulated water sample and the drinking water, and determining the accuracy of the odorous substances discriminated by the gas chromatography-olfaction-mass spectrometry. Through solid phase microextraction, GC-O-MS and sensory evaluation on the odorous substances in the drinking water, the odorous substances in the drinking water are analyzed and discriminated, and the accuracy for discriminating the odorous substances in the drinking water is high.

Description

technical field [0001] The invention belongs to the technical field of analyzing and discriminating peculiar smell substances, and in particular relates to a method for analyzing and discriminating peculiar smell substances in drinking water. technical background [0002] 1. The source of odorous substances in drinking water [0003] The abnormal smell of drinking water is mostly caused by the abnormal smell of water source water. The abnormal smell of water source water can be divided into two categories: one is the artificial odor, which is caused by industrial disinfectants and domestic sewage directly discharged into the water body; the other is The first is a naturally occurring odor, which is mainly caused by aquatic organisms such as algae and actinomycetes, and its content in water is generally at the ppb or μg / L level. Most of the heterosmells naturally occurring in water cannot be directly qualitatively or quantitatively detected at present. With the development ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/18G01N30/88
Inventor 宋焕禄周艳张亚杨辉林锦
Owner INFINITUS (CHINA) CO LTD
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