Abstract
A sensitive method for the determination of excess of mercury in high-purity mercury(II) iodide using Raman spectrometry was developed. The method allows the determination of micro amounts of mercury(I) iodide present in mercury(II) iodide with a sensitivity limit of 10 μ mol mol −1 . Samples with concentrations in the range 18–7200 μ mol mol −1 were analysed and the results were used to construct a calibration graph. The analysis is based on comparison of the relative intensities of the Raman lines at 114 cm −1 of Hg 2 I 2 and that of 140 cm −1 of β-HgI 2 above 130°C. The Raman spectrometric method is at least ten times more sensitive than other methods and seems to be the best technique available for stoichiometric studies of HgI 2 .
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