Selective and precise photometric titration of metal ions with EDTA using masking agents. Part III. Determination of calcium, lead and zinc in mixtures using simple inorganic ions as masks

Abstract

Individual photometric titrations of calcium, lead and zinc (0.01 M solutions) were carried out in the presence of copper, nickel, cobalt, zinc, cadmium, mercury, silver aluminium and tin using a variety of simple inorganic anions as masking agents. Good photometric and linear extrapolation end-points yielding relative standard deviations of 0.06% were achieved in many instances.