The development and preparation of a test paper for mercury in air is described, A measured volume of air is drawn through a silica gel-loaded filter-paper coated with a mixture of copper(1) iodide and sodium carboxymethylcellulose, and in the presence of mercury a pink stain is produced. The paper has been validated in the laboratory and a factory for the reliable determination of mercury vapour in air at concentrations up to 100 pg ~n -~.
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