Behavior of trace metals in the sediment pore waters of intertidal mudflats of a tropical wetland

Vrtical profiles ofdissolvedCd, Cr, Cu, Pb, Zn, Fe, and Mn in the sediment pore waters of the intertidal mudflats of the Mai Po and Inner Deep Bay Ramsar Site of Hong Kong, People's Republic of China, were measured using the polyacrylamide gel diffusive equilibration thin film (DET) technique....

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Published inEnvironmental toxicology and chemistry Vol. 19; no. 3; pp. 535 - 542
Main Authors Yu, Kai-Tung, Lam, Michael Hon-wah, Yen, Yu-Fong, Leung, Amy P.K.
Format Journal Article
LanguageEnglish
Published Hoboken Wiley Periodicals, Inc 01.03.2000
SETAC
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Summary:Vrtical profiles ofdissolvedCd, Cr, Cu, Pb, Zn, Fe, and Mn in the sediment pore waters of the intertidal mudflats of the Mai Po and Inner Deep Bay Ramsar Site of Hong Kong, People's Republic of China, were measured using the polyacrylamide gel diffusive equilibration thin film (DET) technique. The ranges of concentrations of dissolved Cd, Cr, Cu, Pb, Zn, Fe, and Mn in the pore water of the top 0 to 20 cm of sediment were 2.2 to 10.0 nM, 346.0 to 950.0 nM 243.8 to 454.8 nM, 23.2 to 51.2 nM, 39.8 to 249.5 μM, and 13.4 to 20.7 μM, respectively. Enrichment of these trace metals was observed in the upper 0‐ to 7‐cm layer. Profiles of conditional distribution coefficient, log(KD), of the trace metals and results of multiple regression analysis have revealed that reduction of Mn (hydrous) oxides was the major remobilization mechanism for Cd, Cr, Cu, Pb, and Zn in the mudflats. Benthic diffusive fluxes of these trace metals from the mudflats were also estimated on the basis of the concentration gradients of trace metals between surface sediments and the overlying water column. The magnitude of the estimated diffusive fluxes followed the order Zn > Cr > Cu > Pb > Cd.
Bibliography:ark:/67375/WNG-H91093KQ-X
ArticleID:ETC5620190303
istex:6E5C92EC41B25020349257D80A06587080898FF0
ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0730-7268
1552-8618
DOI:10.1002/etc.5620190303