Method and apparatus for detecting mercury

Details Method and apparatus for detecting mercury Method and apparatus for detecting mercury

G - Physics

01

N

G01N 1/00 (2006.01)

Patent

CA 2119113

Mercury Detection Method and Apparatus utilizes cartridges including gold for adsorbing mercury as an amalgam. The adsorbed mercury is desorbed by heating and passed through a Cold Vapour Atomic Fluorescence Spectrophotoreeter. Each cartridge is flushed with an inert gas, so that air and contaminants are never passed directly through the detector, so only inert gas passes through it. To further prevent adsorption of contaminants, the cartridges are maintained at a minimum temperature, above ambient temperature and below 100°C. To enable unattended calibration, a permeation source is provided having a permeation chamber and a value assembly, including 3 separate valves, to ensure than in an off state mercury vapour cannot leak to the cartridges. To ensure an efficient use of the inert gas, its flow can be adjusted between 3 different levels, for flushing, desorption of mercury, and an idle state to maintain the apparatus purged air.

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