Automatic analysis device for analyzing gaseous total mercury

Abstract

The invention relates to an automatic analysis device for analyzing gaseous total mercury. The device comprises an automatic gas inlet mechanism provided with a first pipeline for conveying a be-detected sample gas; a condensation and cracking mechanism which is used for receiving the to-be-detected sample gas, enriching gaseous total mercury in the to-be-detected sample gas at a low temperature and analyzing all the gaseous total mercury in the to-be-detected sample gas into gaseous elemental mercury at a high temperature; an automatic gas transmission mechanism provided with a second pipeline for conveying gaseous elemental mercury; a detection analysis mechanism used for analyzing the total concentration of the gaseous elemental mercury; and a controller used for controlling the automatic operation of the automatic gas inlet mechanism, the condensation and cracking mechanism and the automatic gas transmission mechanism. According to the automatic analysis device, the gaseous total mercury in the to-be-detected sample gas can be completely collected, and the accuracy of analyzing the total mercury concentration of the to-be-detected sample gas is improved, so that the measurement of the total total mercury content of the gas in the sample is really realized, meanwhile, a simple, convenient and reliable online analysis technology is realized, and the analysis cost is reduced.

Description

technical field [0001] The invention relates to the field of sewage monitoring, in particular to an automatic analysis device for analyzing total mercury in water. Background technique [0002] Mercury is the only toxic and harmful heavy metal element that exists in a liquid state at normal temperature and pressure, and is volatile. Therefore, this element is ubiquitous in nature, which can bring huge ecological risks to the ecological environment and cause human poisoning. Therefore, after organizing several rounds of negotiations, the United Nations promulgated the legally binding global mercury convention, the Minamata Convention, which came into effect globally on August 16, 2017, with the aim of reducing emissions and controlling mercury pollution. According to the requirements of the Convention, environmental mercury needs to be monitored to evaluate the performance of the Convention. Therefore, the monitoring of environmental mercury, especially the long-term monitori...

AI Technical Summary

Problems solved by technology

This method can only measure elemental mercury and a part of active mercury and particulate mercury in the air, but cannot fully measure the real gaseous total mercury

[0003] In order to prevent the influence of large particles in the gas sample on the mercury enrichment tube and detector in the traditional gaseous total mercury analysis, it is necessary to remove the large particles in the gas sample before mercury enrichment, and only allow particles smaller than PM2.5 to enter. In other words, most of the particulate mercury in the gas sample is removed, so that the analyzed total gaseous mercury does not contain most of the particulate mercury. In addition, the particulate matter adsorbed on the filter membrane will also absorb the elemental mercury in the gas sample. and active mercury, therefore, the above reasons can cause the measured gaseous total mercury concentration to be lower than the real total mercury concentration

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