ICP-AES Determination of Iron,Cobalt,Nickel,Copper,Silver and Lead in Gold Plating Bath Solution After Separation of Gold by Precipitation

A method of ICP-AES determination of iron,cobalt,nickel,copper,silver and lead in gold plating bath solution,after removal of gold from the solution by precipitation with H2SO4 and hydrogen peroxide,was proposed in this paper.Optimum conalytical conditions for sample treatment and precipitation separation,as well as for AES determination and working parameters of the instrument were described.Detection limits (3S) of the 6 elements found were in the range of 0.002 4 mg·L-1 to 0.067 mg·L-1.Tests for recovery were made on the base of 2 samples of low cyanide containing gold plating solutions by addition of different amounts of standard solutions of the six elements,and analyzed by the proposed method.Values of recovery obtained were in the range of 83.0% to 120.0%,with values of RSD′s (n=5) in the range of 2.36% to 11.83%.