| abstract |
For radio or electro tin, lead or tin-lead alloy plating solutions that may contain copper, the concentration of the metal ion component selected from divalent tin ions, lead ions, and copper ions is taken from the solution and It is determined quantitatively by adding a chemical to cause the selected metal ion to develop a color, measuring the absorbance of the sample due to the metal ion by colorimetric method, and determining the concentration from the absorbance. The choice of chemical depends on the specific metal ion being analyzed. When the solution contains more than one metal ion, the calibration is done by repeating the process with another chemical. |