Trace elements in stream bed sediments from agricultural catchments (Gascogne region, S-W France): Where do they come from?
Trace elements in stream bed sediments from agricultural catchments (Gascogne region, S-W France): Where do they come from?
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DOI：
10.1016/j.scitotenv.2008.12.047
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发表时间：
2009-04-01
影响因子：
9.8
通讯作者：
Probst, A.
中科院分区：
文献类型：
--
作者：
N'guessan, Y. M.;Probst, J. L.;Probst, A.
The Gascogne region (SW of France) is cultivated for more than 75% of the area. 83 samples of stream bed sediments were collected in three main Gascogne river basins (Gers, Save and Touch, left tributaries of the Garonne river) to evaluate the impact of agricultural practices on trace elements behavior. Eight potential harmful elements (PHE) (Cr, Co, Ni, Cu, Zn, As, Cd and Pb), four reference elements for normalization (Sc, Cs, Al and Fe) and four major elements (Mn, Ca, Mg and P) were considered. The average trace element concentrations in the fine fractions (Cr>Ni>Pb>Cu>Co>As>Sc>Cs>Cd. Geochemical investigations and an original approach combining regression analysis and chemical sequential extraction allowed to select the most adequate reference material (regional molasse) and reference element (Cs) for normalization procedure. The enrichment factor (EF) is generally lower than 2.5, particularly for Cr, Ni, Cu, As, Zn; however, 23% of the sampling stations are more contaminated (2.5
