Abstract：A novel method for separation and enrichment of copper with sodium chloride-sodium diethyldithiocarbamate-phenolphthalein system was investigated. The effects of different parameters,such as the dosages of sodium diethyldithiocarbamate(DDTC) solution and phenolphthalein(PP) solution,various salts and acidity on the enrichment yield of Cu2+ have been investigated,the enrichment mechanism was examined. The results showed that,in the presence of 0.5 g of NaCl,when 2.00 mL of 1.0×10－2 mol/L DDTC solution and 1.00 mL of 50 g/L phenolphthalein ethanol solution was selected,the chelate precipitate [Cu(DDTC)2] formed with Cu2+ and DDTC could be quantitatively adsorbed on the microcrystalline phenolphthalein surface at pH 6.0,forming liquid-solid phases with a clear interface,while in this condition,Cd2+,Zn2+,Pb2+,Fe2+ and Al3+ were not adsorbed,thus achieving the quantitative separation of Cu2+ from these metal ions. Consequently,a novel method for separation and enrichment of Cu2+ was established. This method was successfully applied to quantitative separation and enrichment of Cu2+ in the synthetic water samples with enrichment yield of 93.0%-105.4% .
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