Abstract
SUMMARYCu(II) forms barely soluble compounds with glycine in weakly acidic solutions at a molar ratio \\gly\\: \\Cu(II)\\ ≥ 2. The temperature has the most important influence on the solubility of precipitates. The rate and completeness of precipitation depends on the pH adjuster. NaHCO3. Na2CO3 and NH4OH are most suitable. With glycine Cu(II) forms two kinds of the precipitates: cis-Cu(gly)2 H2O and trans-Cu(gly)2 2H2O. The participation of other organic acids such as formic, acetic, malic, phthalic and succinic retards the formation of insoluble Cu(gly)2 compounds to a greater or lesser extent. In case of oxalic acid presence in Cu(II-glycine solution, a precipitate of K2Cu(C204)i2H2O is formed. Using the precipitation of insoluble Cu(II) glycinic compounds and electrolysis makes it possible to recover glycine from spent electroless nickel plating solutions.
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