dbd ionization detector and its detection method

Abstract

The invention relates to a DBD (Dielectric Barrier Discharge) ionization detector. The DBD ionization detector comprises a body, wherein a detection cavity is formed in the body, and a carrier gas inlet and a sample gas outlet are formed on top and bottom of the detection cavity respectively; a tubular column is arranged in the detection cavity; the bottom end of the tubular column is communicated with a sample gas inlet formed on the body; a DBD mechanism and a polarization voltage ion collection mechanism are arranged in the body; the DBD mechanism comprises two opposite discharge electrodes which are positioned at the outer side of the inner wall of the top part of the detection cavity; the polarization voltage ion collection mechanism comprises a polarized electrode and a collector electrode, which stretch into the detection cavity; and the polarized electrode and the collector electrode are connected with a recorder. The DBD ionization detector is divided into a DBD discharge area and a polarization voltage ion collection area vertically, all the compounds are ionized by plasma and all components are effectively detected; the equipment has a simple structure, semi-volatile organic compounds can be continuously monitored without use of the combination of a plurality of detectors, the reaction of the compounds is avoided, and the integrity of the compound ions is ensured and the detection precision is ensured.

Description

technical field [0001] The invention relates to a detection device, in particular to a detector for detecting semi-volatile organic compounds in surface water and drinking water. Background technique [0002] Semi-volatile organic compounds (SVOCs) are a large class of important pollutants in surface water and drinking water. In order to comprehensively monitor water quality, effectively monitor various discharge sources, and respond to environmental pollution accidents in a timely manner, it is necessary to incorporate water SVOC into the online and on-site environmental monitoring system to achieve at least 24 semi-volatile organic compounds in the "Surface Water Environmental Quality Standard" GB3838-2002 Continuous automatic monitoring of monitoring factors. [0003] At present, the commonly used detectors mainly include thermal conductivity detector TCD, hydrogen flame ionization detector FID, electron capture detector ECD, flame photometric detector FPD and so on. Am...

AI Technical Summary

Problems solved by technology

Among these detectors, TCD can realize the detection of all components, but the sensitivity is not high; FID, ECD, FPD and other detectors have strong selectivity, generally need to be used in combination, and the equipment is relatively complicated

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