Method for detecting drinking water odor level based on electronic nose

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...

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

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