A mercury standard gas generator

Abstract

The invention discloses a Hg standard gas generating device, comprising a Hg source evaporation cavity for storing the Hg source, a temperature control cavity surrounding the Hg source evaporation cavity, and a refrigeration cavity with a refrigeration function, wherein the temperature control cavity is arranged in the inner cavity of the refrigeration cavity, the inner cavities of above three cavities are isolated from each other, the inlet pipe and outlet pipe of the Hg source evaporation cavity are communicated with outer gas pipelines by passing through the temperature control cavity and the refrigeration cavity. According to the invention, the temperature control cavity of the Hg standard gas generating device is arranged in the inner cavity of the refrigeration cavity, thus the temperature of the temperature control cavity can be reduced to below the lowest temperature required by temperature control adjustment, the low temperature control is realized to meet the requirement of temperature control adjustment, the precision of temperature control adjustment in the Hg source evaporation cavity is raised, the requirement of Hg standard gas diluted concentration is satisfied, and simultaneously the application range of the Hg standard gas generating device is enlarged.

Description

technical field [0001] The invention relates to the technical field of temperature control, in particular to a mercury standard gas generating device. Background technique [0002] In environmental pollution, heavy metal pollution is one of the important factors that destroy the ecological environment and threaten human health. How to effectively prevent and deal with sudden heavy metal pollution incidents and improve environmental emergency response capabilities and early warning levels has always been a challenge in environmental protection work. main problem. [0003] In order to solve the above-mentioned environmental problems, in the current technology and method research of environmental emergency monitoring, the development of environmental early warning and monitoring technologies such as environmental risk identification, assessment, prevention, and emergency response is the main research direction. [0004] Among them, the mercury standard gas generator has been w...

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Problems solved by technology

[0005] The lowest temperature in the constant temperature device in the above-mentioned device is approximately equal to the external ambient temperature. When the external ambient temperature is relatively high (higher than or close to 50 degrees Celsius), the initial temperature of the constant temperature device is already higher than the ambient temperature or close to the ambient temperature. The temperature cannot be adjusted to the evaporation temperature of the Hg source or the adjustment amount adjusted to the evaporation temperature of the Hg source is relatively small, which will lead to a higher concentration of mercury vapor corresponding to the saturated evaporation, and a higher concentration after dilution ratio, which cannot meet the needs of the site

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