A technique is described for selectively measuring the forms of chromium in freshwater samples, with detection limits of 21 ng L-1 for Cr(III), 4 ng L-1 for Cr(VI), and 8 ng L-1 for colloidal/organic Cr. Recovery of the Cr(VI) and Cr(III) spikes were consistently >90%, but only about 70% for the added organic Cr. When the method was applied to samples from Lake Ontario, it was found that Cr(VI) made up 75-85% of the dissolved Cr and that Cr(III) was consistently below the analytical detection limit. About 10% of the dissolved Cr was in the colloidal/organic form. Average concentrations of total dissolved Cr in the epilimnetic waters were found to be 69 ng L-1 in Lake Superior, 136 ng L-1 in Lake Erie, and 351 ng L-1 in Lake Ontario. The increasing concentration of Cr down the Great Lakes watershed reflects the conservative geochemical behaviour of Cr(VI) and the increasing input of Cr from industrial and municipal sources.

Chromium Speciation and Distribution in the Great Lakes / Beaubien, Stanley Eugene; J., Nriagu; D., Blowes; G., Lawson. - In: ENVIRONMENTAL SCIENCE & TECHNOLOGY. - ISSN 0013-936X. - STAMPA. - 28:(1994), pp. 730-736. [10.1021/es00053a029]

Chromium Speciation and Distribution in the Great Lakes

BEAUBIEN, Stanley Eugene;
1994

Abstract

A technique is described for selectively measuring the forms of chromium in freshwater samples, with detection limits of 21 ng L-1 for Cr(III), 4 ng L-1 for Cr(VI), and 8 ng L-1 for colloidal/organic Cr. Recovery of the Cr(VI) and Cr(III) spikes were consistently >90%, but only about 70% for the added organic Cr. When the method was applied to samples from Lake Ontario, it was found that Cr(VI) made up 75-85% of the dissolved Cr and that Cr(III) was consistently below the analytical detection limit. About 10% of the dissolved Cr was in the colloidal/organic form. Average concentrations of total dissolved Cr in the epilimnetic waters were found to be 69 ng L-1 in Lake Superior, 136 ng L-1 in Lake Erie, and 351 ng L-1 in Lake Ontario. The increasing concentration of Cr down the Great Lakes watershed reflects the conservative geochemical behaviour of Cr(VI) and the increasing input of Cr from industrial and municipal sources.
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Chromium Speciation and Distribution in the Great Lakes / Beaubien, Stanley Eugene; J., Nriagu; D., Blowes; G., Lawson. - In: ENVIRONMENTAL SCIENCE & TECHNOLOGY. - ISSN 0013-936X. - STAMPA. - 28:(1994), pp. 730-736. [10.1021/es00053a029]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/761208
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