Heavy Stable Isotope Investigations in Environmental Science and Archaeology

Heavy Stable Isotope Investigations in Environmental Science and Archaeology
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Published on 2008 by ProQuest

Galena has been reported from more than two hundred prehistoric \u003cbr\u003e\n\u003cb\u003earchaeological\u003c/b\u003e sites in eastern North America (Austin et al., 2000, Walthall, 1981) \u003cbr\u003e\n(Figure 4.1). These burial and habitation sites range in age from the Middle \u003cbr\u003e\nArchaic to ...

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Mass Independent Fractionation (MIF) of mercury isotopes produced by both Nuclear Volume Effect (NVE) and Magnetic Isotope Effect (MIE) could be an important tool in constraining models of mercury sources and pathways in the environment. Deviations from mass-dependent fractionation were calculated as the difference between the measured Delta199Hg and Delta 201Hg (DeltaAHgmeasured) of a sample and the Delta199Hg and Delta201Hg (Delta AHgMD) obtained from the linear scaling defined by the even-mass isotopes. The NVE induces a MIF in the odd-A Hg isotopes in the ratio, Delta201Hg/Delta199Hg≈0.5, with the odd mass isotopes enriched in the reduced species such as Hg (0) and methylmercury and depleted in oxidized species such as Hg (II). The sediment samples and the Patagonia peat analyzed in this study are enriched in the odd-A Hg isotopes in approximately correct ratios for NVE. The Penido Vello peat core and Spanish moss samples are depleted in the odd-A Hg isotopes and exhibit Delta 201Hg/Delta199Hg≈1 which is consistent with MIE.

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