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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Kai-Tung Yu
  • Michael Hon-Wah Lam
  • Yu-Fong Yen
  • Amy P.K. Leung

Detail(s)

Original languageEnglish
Pages (from-to)535-542
Journal / PublicationEnvironmental Toxicology and Chemistry
Volume19
Issue number3
Publication statusPublished - 2000

Abstract

Vertical profiles of dissolved Cd, 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(K(D)), 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.

Research Area(s)

  • Hong Kong, Mai Po, Pore waters, Trace metals, Wetlands

Citation Format(s)

Behavior of trace metals in the sediment pore waters of intertidal mudflats of a tropical wetland. / Yu, Kai-Tung; Lam, Michael Hon-Wah; Yen, Yu-Fong et al.

In: Environmental Toxicology and Chemistry, Vol. 19, No. 3, 2000, p. 535-542.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review