May 2011
Heavy metal speciation trends in mine slime dams: A case study of slime dams at a goldmine in Zimbabwe
Heavy metal speciation trends in the slime dams at a typical gold mine in Zimbabwe were studied using a six-step sequential extraction technique to give six fractions, namely, the exchangeable, acid soluble, easily reducible, moderately reducible, oxidizable and residual fractions. The elements studied include Cd, Co, Ni, Cu, Zn, Cr, Fe and Mn. Cadmium was found mainly in the acid soluble fraction, and...
May 2011
Environmental mobility and geochemical partitioning of Fe, Mn, Co, Ni and Mo in sediments of an urban river
Environmental mobility and geochemical partitioning of iron (Fe), manganese (Mn), cobalt (Co), nickel (Ni) and molybdenum (Mo) were examined in sediments collected from the whole old Nakagawa river (NR), Tokyo, Japan. A combined 6- step sequential extraction procedure was employed for the partitioning of the metals and the concentrations were measured in the liquid extracts by atomic absorption...
May 2011
Health of Brockport creek following removal of contaminated sediment from an upstream tributary
After removing contaminated sediments from a toxic waste site’s outlet stream into Brockport creek, PCB concentrations in the outlet stream dropped from 1,730 to 34,900 µg/kg in 2002 to 288 to 432 µg/kg in 2003. Concentrations are now below water quality criteria for aquatic organisms and human health. Concentrations of eight metals (Arsenic, Barium, Cadmium, Chromium, Copper, Lead, Nickel,...
May 2011
Measurement uncertainty for the determination of the inhibitory effect on Vibrio fischeri: A practical approach
The 11348-3:2007 ISO method allows the evaluation of the inhibitory effect of water samples on the light emission of Vibrio fischeri; it is essential to quantify the measurement uncertainty, but there is no available guideline. The aim is to come up with a practical approach to calculate the measurement uncertainty. We propose a test with different 3,5-dichlorophenol dilutions to evaluate if the...
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