| Abstract: | Zinc is a fairly abundant metal, it has been estimated that zinc represents 0.004 percent of the earth's crust and is twenty-fifth in the order of abundance. Its concentrations in surface waters vary greatly with locality; the highest concentrations of zinc have been observed in areas with acid mine drainage, but zinc enters surface waters in many other ways. Chemical thermodynamic calculations summarized by solubility graphs are given. The zinc solubility may be significantly controlled by stream sediments; Zn concentrations of sediments from various areas are given. Many techniques for extraction from sediments have been developed, they differ in efficiency. |
