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hydroxylamme sulfate solutIon (6 4) to reduce the excess permanganate Purge the dead aIr space and contmue as descnbed under (7 1) 9. CalculatIOn 9 1 9 2 9 3 Measure the peak height of the unknown from the chart and read the mercury value from the standard curve Calculate the mercury concentratIOn m the sample by the formula ug Hg m the ahquot ugHg/g = wt of the aliquot in gms Report mercury concentratIOns as follows Below 0 1 ug/gm, <0 1, between Oland 1 ug/gm, to the nearest 001 ug, between 1 and 10 ug/gm, to nearest 0 1 ug, above 10 ug/gm, to nearest ug 10 PrecIsIon and Accuracy 10.1 The followmg standard devIatIons on rephcate sediment samples were recorded at the mdicated levels, 029 ug/g ±O 02 and 082 ug/g ±O 03 Recovery of mercury at these levels, added as methyl mercunc chlOrIde, was 97% and 94%, respectIvely Bibliography 1. Bishop, J N, "Mercury m SedIments", Ontano Water Resources Comm, Toronto, OntarIo, Canada, 1971 2 SaIma, M , prIvate commumcatIOn"EP A CallNev Basm Office, Almeda, Cahforma 2455-4PDF Image | Methods for Chemical Analysis of Water and Wastes
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