Two weakly basic anion exchangers have been investigated for the selective uptake of cations. The cashewnut‐ shell liquid ‐ tetraethylene pentamine resin absorbs copper, nickel and cobalt at different pH of external solution. The unbuffered melamine‐based resin was specific for copper, which could be separated from nickel and cobalt completely.
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Dasare et al. (1969) studied this question.
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