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Bondar Clegg (lake and stream sediment) CV(Hg) - 5ml conc. HNO3, 0.3ml conc. HCL
Bondar Clegg, lake and stream sediment; atomic absorption spectroscopy (mercury, cold vapour) – 5ml conc. HNO3, 0.3ml conc. HCL
Mercury is determined by the Hatch and Ott procedure with some modifications. The method is described by Jonasson et al. (1973). A 0.5 gram sample reacts with 5 mL concentrated HNO3 and 0.3 mL concentrated HCl in a test tube for 10 minutes at room temperature prior to 2 hours of digestion with mixing at 90° C in a hot water bath. After digestion, the sample solutions are cooled and diluted to 100 mL with metal-free water. The Hg present is reduced to the elemental state by the addition of 10 mL 10% w/v SnCl2 in a 10% solution of HCl. The Hg vapour is then flushed by a stream of air into an absorption cell mounted in the light path of an atomic absorption spectrophotometer. Absorption measurements are made at 253.7 nm. Detection limit = 10 ppb.
Jonasson, I.R., Lynch, J.J. and Trip, L.J. (1973). Field and laboratory methods used by the Geological Survey of Canada in geochemical surveys: no. 12, Mercury in ores, rocks, soils, sediments and water. Geol Surv. Can. Paper 73-21.
Sample material: solid
Sample weight: 500 milligrams
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