The present invention discloses a device and a method for valence state conversion and measurement of
gaseous mercury. The device comprises a dust-removal filter
cartridge, a condensation chamber, anelectric control panel, a three-way valve, a plurality of peristaltic pumps and a plurality of solution storage bottles. The condensation chamber is provided with a first-stage absorption
bottle, a second-stage absorption
bottle, a third-stage absorption
bottle and a fourth-stage absorption bottle; the dust-removal filter
cartridge is connected with an intake
pipe, and the top of the fourth-stageabsorption bottle is connected with an outtake
pipe; the temperature in the condensation chamber is maintained at 2-6 DEG C by using an electronic condenser; and the three-way valve is arranged on theintake
pipe to divide the intake air into two paths to be entered into different absorption bottles. According to the technical scheme of the present invention, the integrated treatment of dust removal, water removal and
acid gas removal is performed on the to-be-measured gas, the
oxidation state of mercury is converted into zero-valence mercury by using the
redox method of
chemical solution absorption, and the real-time detection of
elemental mercury, oxidized mercury and gaseous total mercury can be realized by using the mercury on-line analyzer.