Abstract
The application of isotope dilution inductively coupled plasma mass spectrometry for the determination of mercury in sediment and water samples using an enriched 201 Hg spike is described. Sediment samples are determined directly after spiting with 201 Hg and a 1-h acid digestion. The procedural detection limit is 2 ng/g using a 0.5-g sample. Quantitative recovery is obtained on NRC reference standard (BEST-1), which is certified at 92±9 ng/g. Natural levels of mercury in water samples require preconcentration onto gold traps and subsequent electrothermal heating and purging of the traps with argon directly into the torch of the ICPMS
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