Subsidized via The Extraction and Processing department (EPD) of TMS, The Mineral and Metallurgical Processing department (MPD) of SME, Metallurgical Society (MetSoc) of CIM 2003 TMS/EPD Fall assembly held along with thirty third Annual Hydrometallurgy assembly and 2003 convention of Metallurgists Vancouver BC Canada August 24-27,2003.Content:
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Extra resources for Electrometallurgy and Environmental Hydrometallurgy, Volume 2
Experiments have shown that Ag + and Cu+ can affect gill Na + transport in both directions. Cd** and Zn++ disrupt Ca++ metabolism on gills. Sprague (38) documented the lowering of toxicity with increasing hardness of water because of the successful competition Ca** exerted for critical metal binding sites. Another step was provided by Playle  who showed the high correlation that existed between the degree of a metal's accumulation at gill binding sites and toxicity. The Biotic Ligand Model The Biotic Ligand Model (BLM) evolved from the other models with the recognition that the quantitative prediction of gill site occupancy was central to predicting toxicity for fish [40,41].
Recent progress in speciation of Zn, Cd, Cu and Pb in agricultural soil pore water has been reported using a semi-permeable cation-exchange membrane and Donnan dialysis . Other progress in water analysis is being made. For example, analytical methods are paying attention to clean techniques because of the low levels of metals in aquatic systems that may be able to exert toxic effects . The need to avoid analyzing fine solid matter in waters is critical. Filtration is commonly used to obtain total dissolved fractions, but precautions must be taken .
E. G. Fletcher, "Determinants of reactivity in metal toxicology", in Toxicology of Metals, ed. W. Change (New York, NY: Lewis Publishers, 1996). 17. M. Skeaff, P. King and M. King, "Quiescent transformation studies of the metals Cd, Cu, Ni and Za and the corresponding chlorides for acute hazard identification and aquatic toxicity testing", submitted to Environ. Toxicol. Chem. (2002). 18. 63 Federal Register, 53417, October 5,1998. 19. 63 Federal Register, 63926-7, November 17,1998. 20. 64 Federal Register, 688, January 5, 1999.