Abstract
The behaviour of mercury(I) ion in the cold-vapour atomic absorption spectrometry under nonreducing conditions is discussed. The signal obtained corresponds to about 35% of total mercury present. Under the same conditions, the same quantity of Hg 2+ is found by dithizone spectrophotometry. Thus the cold-vapour signal is due entirely to disproportionation of mercury(I), which is not inhibited by chloride at mercury concentrations less than 120 μg l −1. The cold-vapour signal si pH-dependent and at low hydrogen ion concentration, approaches the value expected from complete disproportionation.
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