Blowing and sweeping trapping instrument used for continuously observing volatile organic compounds in water online

Abstract

The invention provides a blowing and sweeping trapping instrument used for continuously observing volatile organic compounds in water online, and relates to detection on the volatile organic compounds in a water body. Nitrogen has access to a sample outlet of a sample injection six-way valve through a nitrogen inlet connected with the sample injection six-way valve and a quantitative loop, a sample outlet of the sample injection six-way valve is connected into a blowing and sweeping chamber. Gas stripping is conducted on samples in the blowing and sweeping chamber. Gas blown and swept out of the blowing and sweeping chamber enters a trapping pipe sequentially through a hand-operated six-way valve, a drying pipe and a ten-way valve. A circulation water cooling system is arranged outside the trapping pipe, a refrigeration piece and a heating pipe. The water inlet of a drain valve is formed in the blowing and sweeping chamber. The inlet of a drying pipe flow controller is externally connected with a dry air source, and the outlet of the drying pipe flow controller is connected with the drying pipe. The target object outlet of the ten-way valve enters a separation detector through a heating analysis flow controller and a gas phase color spectrum sample injection six-way valve. The nitrogen inlet of the gas phase color spectrum sample injection six-way valve is externally connected with a nitrogen source. The dry air inlet of the separation detector is externally connected with the dry air source. The hydrogen inlet of the separation detector is externally connected with a hydrogen source.

Description

technical field [0001] The invention relates to the detection of volatile organic compounds in water bodies, in particular to a purging and trapping instrument for continuous on-line observation of VOCs in water. Background technique [0002] The principle of the purge and trap method is generally to use high-purity nitrogen or helium to lift and purge the water sample or soil sample in the chamber, to purge out the volatile gas dissolved in the soil or water, and enrich it until it is filled with In the collection tube of active filler, it can be collected at room temperature or low temperature. After the purge is completed, the trapping tube is heated instantaneously, and the trapped gas sample to be analyzed is analyzed and entered into the instrument and detector for determination. [0003] Purge and trap technology is widely used, and it is often used to determine volatile and semi-volatile organic compounds in water, soil and atmosphere after being combined with chrom...

AI Technical Summary

Problems solved by technology

Although the technology has been greatly improved, it is still not possible to achieve low-temperature cold hydrazine capture

However, the method of cooling with liquid nitrogen and liquid carbon dioxide is not only expensive, but the large cold liquid tank is inconvenient to carry, and the number of analyzed samples is often limited by the refrigerant

Images