Abstract
Summary The behaviour of metal ions with EDTA and TAA in acid and alkaline solutions is discussed and a specific quantitative determination of zinc is described. The use of TAA instead of hydrogen sulfide provides a much better separation of zinc from the elements of group II. After addition of EDTA and ammonia, iron, aluminium and manganese are precipitated in the filtrate as hydroxides by addition of calcium chloride. Zinc is then precipitated as the sulfide with TAA, while nickel and chromium remain in solution. After the precipitate has been dissolved zinc is determined by chelatometric titration with EDTA. As little as 0.6 mg of zinc can be determined in presence of a large excess of other group II and group III elements.
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