The speciation of trace metals in freshwater colloidal and dissolved phases
Freshwaters were collected from Vale Lake, West .Midland, UK. Cross flow ultrafiltration (CFUF) system with 1-kDa filtration membrane was used for the size fractionation from freshwaters. Mass balance results showed very good recovery of trace metals and TOC in fresbwaters through CFUF system. Four fractions: raw water, filtered water (<1μm), colloidal materials (1kDa1μm) and real dissolved phase (<1kDa), were obtained for the analysis of the phase distribution of Co (Ⅱ), Ni (Ⅱ), Cu(Ⅱ), Zn(Ⅱ), Cd(Ⅱ) and Pb (Ⅱ). The results showed that. in Vale Lake, an insignificant fraction of Co (Ⅱ), Ni (Ⅱ) was distributed in particulate, while for Cu and Pb, the fraction of 60％ was assigned to particulate phase. Substantial amounts (10％-40％) of metals except for Zn<2> are associated with colloids. Lead was found to be least in the real dissolved phase (10％). These metals were strongly bound to the surface sites of colloidal materials although small amount of metal-labile was found in colloidal phase. Inert complexes of these metals with organic ligands were observed in real dissolved phase.
CFUF speciation trace metals freshwater
R. Liu J. R. Lead
Division of Environmental Health and Risk Management, School of Geography, Earth and Environmental Science, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
786-787
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）