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Antarctic snow: metals bound to high molecular weight dissolved organic matter

TitleAntarctic snow: metals bound to high molecular weight dissolved organic matter
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2017
AuthorsCalace, N., Nardi Elisa, Pietroletti M., Bartolucci E., Pietrantonio Massimiliana, and Cremisini C.
JournalChemosphere
Volume175
Pagination307-314
ISSN00456535
Abstract

In this paper we studied some heavy metals (Cu, Zn, Cd, Pb, As, U) probably associated to high molecular weight organic compounds present in the Antarctic snow. Snow-pit samples were collected and analysed for high molecular weight fraction and heavy metals bound to them by means of ultrafiltration treatment. High molecular weight dissolved organic matter (HMW-DOM) recovered by ultrafiltration showed a dissolved organic carbon concentration (HMW-DOC) of about 18–83% of the total dissolved organic carbon measured in Antarctic snow. The characterisation of HMW-DOM fraction evidenced an ageing of organic compounds going from surface layers to the deepest ones with a shift from aliphatic compounds and proteins/amino sugars to more high unsaturated character and less nitrogen content. The heavy metals associated to HMW-DOM fraction follows the order: Zn > Cu > Pb >> Cd ∼ As ∼ U. The percentage fraction of metals bound to HMW-DOM respect to total metal content follows the order: Cu >> Pb > Zn, Cd in agreement with humic substance binding ability (Irwing-William series). Going down to depth of trench, all metals except arsenic, showed a high concentration peak corresponding to 2.0–2.5 m layer. This result was attributed to particular structural characteristic of organic matter able to form different type of complexes (1:1, 1:2, 1:n) with metals. © 2017 Elsevier Ltd

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85013414399&doi=10.1016%2fj.chemosphere.2017.02.052&partnerID=40&md5=a9d5b6cf199277cdd80336787d698d67
DOI10.1016/j.chemosphere.2017.02.052
Citation KeyCalace2017307