Online pretreatment device for detecting VOCs (volatile organic compounds) in water

Abstract

The invention discloses an online pretreatment device for detecting VOCs (volatile organic compounds) in water, wherein VOCs is an abbreviated form of volatile organic compounds. Steps such as sampling, sample pretreatment, automatic sample feeding, washing and the like can be completed by controlling the state of an electromagnetic valve and utilizing a single sample scavenging conduit, and the continuous water sample pretreatment technology is realized; compared with the prior art that manual sampling and manual sample releasing are needed, the water sample can be automatically fed; the entire process is controlled by adopting programs, the manual sampling is not needed, the procedures for getting the water sample, getting a standard sample and washing the sample can be automatically realized, and the in-situ continuous monitoring can be facilitated; the online pretreatment device is simple and convenient in operating flow and high in enrichment factor, and no solvent is used.

Description

technical field [0001] The invention relates to the technical field of water quality monitoring, in particular to an online pretreatment device for detecting VOCs in water. Background technique [0002] Volatile organic compounds (volatile organic compounds, referred to as VOCs) refer to those chemical substances with a boiling point equal to or lower than 250°C. VOCs widely exist in air, water, soil and other media, and their main components are compounds such as aliphatic hydrocarbons, aromatic hydrocarbons, halogenated hydrocarbons, aldehydes and ketones. VOCs are migratory, persistent and toxic, and are an important class of environmental pollutants. The quality of drinking water directly affects people's health. The harm of VOCs in drinking water to human health has attracted the attention of various countries. Both the World Health Organization and my country's water quality standards have put forward limit value requirements for these indicators. At present, some im...

AI Technical Summary

Problems solved by technology

However, the current automatic sampling-purge and trap technology requires manual sampling and setting out, which cannot be fully automated. For complex samples, manual filtration and other pretreatment steps are still required, and a large number of manual operations are still required.

This technology is obviously not suitable for automatic on-line analysis of water samples in on-site environmental water bodies.

On the other hand, the level of intelligence is low, the detection process cannot be automatically recorded, and the root cause of failure cannot be found

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