Examination of an Improved Passive Sampler for Gaseous Mercury on the Landfill Site.
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概要
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A passive sampler of diffusion type is one of useful apparatus for the monitoring of gaseous substances in the open field where electric supply is limited. An improved passive sampler of pencil type for gaseous mercury was developed and applied to a preliminary survey of atmospheric gaseous mercury on landfill sites. The amount of collected mercury by the sampler was revealed to vary in proportion to the diameter of diffuser opening, and in inversely proportion to the length of diffuser. The efficiency of mercury absorption was approximately constant regardless of atmospheric concentration range (0.01-1 ng/day) . The atmospheric gaseous mercury concentration on landfill sites could be estimated to be about 2-2000 ng/m<SUP>3</SUP> by the proposed passive sampler, which was in agreement with the data obtained by an active sampler.
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