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Method for detecting drinking water odor level based on electronic nose

A technology of electronic nose and drinking water, which is applied in the level field, can solve the problems of high test cost and long time consumption, and achieve high sensitivity and convenient and fast detection process

Inactive Publication Date: 2021-01-29
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used methods are smell and taste hierarchy analysis (FPA) and gas chromatography-mass spectrometry (GC / MS). The former is highly subjective, and it is easy to cause olfactory fatigue to affect the analysis results after long-term sniffing and testing. The latter is more costly. It takes a long time, and due to the synergistic and masking effects between different smell and taste substances, it is difficult for GC / MS to link the chemical composition information of different smells with the smell and taste characteristics and grades

Method used

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  • Method for detecting drinking water odor level based on electronic nose
  • Method for detecting drinking water odor level based on electronic nose
  • Method for detecting drinking water odor level based on electronic nose

Examples

Experimental program
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Embodiment example 1

[0050] Determination of optimal pretreatment experimental conditions:

[0051] The single control variable method was used to study the response of the sensor under different volumes, different water bath temperatures, different solid sodium chloride additions, and different stirring speeds using the headspace sampling method and the electronic nose instrument test, and compared them under different conditions. The size of the sensor response value of the electronic nose test is optimized to maximize the experimental conditions of the electronic nose response.

[0052] (1) Cleaning of electronic nose detection equipment

[0053] Set the cleaning parameters of the electronic nose detection equipment, clean the ten sensors in the equipment, and detect the stability of the electronic nose baseline.

[0054] (2) Eliminate smell and taste interference in ambient gas

[0055] The electronic nose detection equipment is used to detect the gas smell in the test environment filtered b...

Embodiment 1

[0067] In embodiment 1, by Figure 1~4 It can be seen that the single control variable method is adopted, and by comparing the response value of the electronic nose sensor, the optimal water sample pretreatment conditions are obtained: water bath heating 65°C, heating time 10min, headspace sampling method, headspace sampling method The volume of the water sample to be injected is 200mL, and it is allowed to stand still without adding sodium chloride.

[0068] The optimal water sample pretreatment conditions are used for water sample pretreatment, so that the response value of the electronic nose to the same water sample is significantly increased, and the detection limit of the electronic nose is greatly reduced, so that the electronic nose can smell and detect a lower concentration of smell water samples, improving the detection sensitivity.

Embodiment example 2

[0070] The method of using electronic nose to detect the smell and taste of drinking water is optimized to detect six different raw waters in a city H and predict their smell and taste intensity levels.

[0071] (1) Cleaning of electronic nose detection equipment

[0072] Set the cleaning parameters of the electronic nose detection equipment, clean the ten sensors in the equipment, and detect the stability of the electronic nose baseline.

[0073] (2) Eliminate smell and taste interference in ambient gas

[0074] The electronic nose detection equipment is used to detect the gas smell in the test environment filtered by activated carbon to ensure that the sensor response value is normalized.

[0075] (3) Eliminate smell and taste interference from containers to be used

[0076] Add low-concentration sodium hydroxide solution prepared with ultrapure water to the container, ultrasonically clean it, take it out and wash it with ultrapure water for 3 to 5 times, air dry it natura...

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Abstract

The invention discloses a method for detecting the odor level of drinking water based on an electronic nose. The method comprises the following steps: (1) cleaning each sensor in electronic nose detection equipment until the stability of an electronic nose baseline is reached; (2) ensuring that the smell of gas in a test environment does not interfere with a detection result; (3) cleaning a container for later use; (4) transferring a drinking water sample to be detected into the container for later use for pretreatment under the experimental conditions of conducting standing in a water bath at60-70 DEG C, conducting heating for 5-15 minutes, and introducing 200mL of a water sample into the container in a headspace sample introduction manner; and (5) analyzing a sensor signal, establishinga relationship between the odor level strength or the water quality index of the water sample and the electronic nose response by adopting a PLS regression method, evaluating the quality of the model, judging the odor level of the drinking water, and predicting the quality of the drinking water. The method lays a foundation for rapid and stable identification and odor intensity distinguishing ofodor substances in drinking water by using the electronic nose, and provides method support for water quality monitoring in water transportation and distribution management and water source management.

Description

technical field [0001] The invention relates to the field of water quality detection and protection, in particular to a method for detecting abnormal smell levels of drinking water based on an electronic nose. Background technique [0002] Among the sudden water pollution incidents, most of them are caused by abnormal smell and odor in drinking water, and the most serious ones may cause the whole city to be forced to stop water supply. Although there are relatively complete emergency response measures and systems at present, the occurrence of odor problems has not been effectively controlled. The main reason is that pollution accidents with odor and odor have the following characteristics: 1) The source of odor is uncertain, difficult to Investigate the source of smell; 2) The content of olfactory substances is extremely low, basically at the level of ng / L; 3) The residence time is short, and it is difficult to predict and warn; 4) Generally, it is a compound smell, with env...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/18G01N33/00G01N27/12G01N1/44
CPCG01N1/44G01N27/12G01N33/0006G01N33/0062G01N33/18
Inventor 张可佳散雨龙张土乔杨玉龙岑程吴小刚
Owner ZHEJIANG UNIV
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