Effect of cations on copper adsorption by kaolin |
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| Authors: | Gian C Gupta Florence L Harrison |
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| Institution: | 1. Department of Natural Sciences, University of Maryland Eastern Shore, 21853, Princess Anne, MD, U.S.A.
2. Division of Biomedical and Environmental Sciences, Lawrence Livermore Laboratory, 94550, Livermore, CA, U.S.A.
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| Abstract: | Varying amounts of CaCl2 or MgCl2 were first equilibrated with a dilute suspension of H+-kaolin and then with spiked (high activity radioactive 64Cu) water. After filtration, through 0.45 μm Millipore membrane the amount of radioactivity on the filter and the filtrate was measured separately using a Gamma ray well counter. Adsorption of Cu (expressed as distribution coefficient ?K d ) was plotted against Ca or Mg concentration. K d values decreased sharply at Ca or Mg concentration from 0 to 10 mg l?1 and changed only slightly from 10 to 200 mg l?1. Increase in the concentration of Ca or Mg reduces the Cu binding capacity of the clay. |
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