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DOI: 10.5593/sgem2017H/33/S12.053

USE OF PYROPHOSPHATE EXTRACT TO DETERMINE ORGANIC-BOUND FORMS OF COPPER AND IRON IN BOTTOM SEDIMENTS: THE CASE STUDY OF THE VYSHNEVOLOTSKY RESERVOIR, RUSSIA

O. Lipatnikova, T. Shestakova, D. Podlepina
Thursday 23 November 2017 by Libadmin2017

References: 17th International Multidisciplinary Scientific GeoConference SGEM 2017, www.sgemviennagreen.org, SGEM2017 Vienna GREEN Conference Proceedings, ISBN 978-619-7408-27-0 / ISSN 1314-2704, 27 - 29 November, 2017, Vol. 17, Issue 33, 423-430 pp; DOI: 10.5593/sgem2017H/33/S12.053

ABSTRACT

Speciation of heavy metals in bottom sediments defines their ecotoxicity and mobility and therefore needs to be studied thoroughly. Usually single and sequential extraction techniques are used to determine water-soluble, exchangeable, specifically sorbed and carbonates, bound to organic matter, bound to Fe and Mn hydroxides and residual forms.
Bottom sediments of the Vyshnevolotsky reservoir (the Upper Volga, the Central region of Russia) were chosen for the research. Lithological and mineral composition of samples was characterized. Extraction of organic-bound forms of copper and iron was conducted with use of sodium pyrophosphate. Since sodium pyrophosphate also partially attacks Fe and Mn hydroxides, modificated Tessier sequential extraction scheme was applied to control extracted forms of metals. Copper and iron contents in extracts were determined by means of atomic absorption spectroscopy.
The results of the study indicate that sodium pyrophosphate mainly extracts organically bound copper and amorphous hydroxide and oxide forms of iron which comply with prevailing forms of these elements.

Keywords: copper, iron, bottom sediments, organic-bound forms, sodium pyrophosphate extract, sequential extraction scheme

PAPER DOI: 10.5593/sgem2017H/33/S12.053, USE OF PYROPHOSPHATE EXTRACT TO DETERMINE ORGANIC-BOUND FORMS OF COPPER AND IRON IN BOTTOM SEDIMENTS: THE CASE STUDY OF THE VYSHNEVOLOTSKY RESERVOIR, RUSSIA

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