Abstract
The macroporeus resin XAD-7 gives a fast rate of uptake of copper when used as a support for LIX-64N; it is superior to cellulose powder and other macroporous resins. The rate of uptake is satisfactory up to loadings of 60% ( w w ), and the use of purified LIX-65N or the addition of LIX-63 gives no improvement in rate. The use of toluene as a diluent reduces the rate of extraction. Elution curves for copper show negligible tailing, and rapid separations of copper from other metals by selective absorption are demon- strated. Copper can be concentrated from very dilute solution at a flow rate of 50 ml min -1, and a 99% recovery is obtained. The method has been applied to the rapid determination of copper in brass and bronze.
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