Mercury measuring instrument with temperature compensation and regeneration functions and mercury measuring method

Abstract

The invention relates to a mercury measuring instrument with temperature compensation and regeneration functions and a mercury measuring method. The mercury measuring instrument comprises an air inlet, an air outlet, a dust filter, a three-way electromagnetic valve group, a sampling pump, a flow sensor, a buffer tank, a regeneration sensor, a purifier and a control processing module. The mercury measuring method comprises the following steps: the sampling pump works so that gas to be measured enters the regeneration sensor; the control processing module collects an electric signal and processes the electric signal to obtain an initial mercury gas concentration value; performing temperature compensation operation to obtain a final mercury gas concentration value; and performing sensor regeneration and mercury purification treatment. The method has the advantages that the problem that the measurement error is increased due to saturation of the mercury adsorption amount of the detection electrode is solved through the regeneration sensor, meanwhile, the measurement error at the dynamic temperature is effectively reduced through temperature compensation operation, and interference of temperature drift of the mercury sensor on detection gas is weakened; the structure is small and light, samples do not need pretreatment, operation is easy, and on-site real-time environmental mercurypollution detection is met.

Description

technical field [0001] The invention belongs to the technical field of environmental detection, and in particular relates to a mercury measuring instrument with temperature compensation and regeneration functions and a mercury measuring method. Background technique [0002] With the rapid development of industry, while bringing huge economic benefits, it has also caused serious environmental pollution. Among them, mercury pollution has attracted worldwide attention. Mercury is mainly present in the atmosphere as elemental mercury (Hg 0 ) form, accounting for about 90% of the total. Therefore, the detection of mercury in the environment has been valued by the state, and it has been stipulated that the concentration of mercury vapor in the air should not exceed 0.01mg / m 3 , it is generally believed that the mercury concentration in humans is 1.2-8.5mg / m 3 It can quickly cause poisoning in the environment. [0003] At present, atmospheric environmental mercury detection ad...

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Problems solved by technology

[0003] At present, atmospheric environmental mercury detection adopts on-site sampling points to take atmospheric samples, fill them into pre-configured specific reaction liquid samplers, and then bring them back to the laboratory for digestion. The digested products are used for mercury determination in a mercury detector. Due to the long reaction time and complicated operation in the process of fixing and digesting mercury, it is easy to introduce human error, which directly affects the accuracy of the measurement results; in addition, the current mainstream mercury measurement methods in the market are cold atomic fluorescence method and cold atomic absorption spectrometry. method and gold film mercury measurement method, the first two methods are spectroscopic methods, both will be interfered by other gas components in the analysis sample gas, such as SO 2 , NO x and H 2 S et al. have a strong absorption band near the mercury resonance line at 253.65 nm, which causes instrument deviation response and affects the accuracy of the measurement results; the gold film mercury measurement method has high collection efficiency, high sensitivity, and easy operation for atmospheric mercury. Not easily affected by environmental interfering gases, but the amount of mercury adsorbed by the gold film reaches 10 -7 It tends to be saturated at the g level, resulting in a large measurement error. Although the mercury on the gold film can be released and removed by heat treatment, according to literature reports, it is pointed out that the gold film is due to the influence of electron grain boundary scattering. When the temperature rises , the conductivity in the in-plane direction of the gold film shows a downward trend, and there is a serious temperature drift, which will undoubtedly reduce the accuracy of mercury detection

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