Abstract
Disodium 3-(2-pyridyl)-1,2,4-triazine-5,6-di(4′-phenylsulphonate) is used for determination of iron in metal analysis. High selectivity is achieved by using a ligand buffer and substoichiometric masking. Interference from ⩽ 0.9 mg of Cu(II) can be completely eliminated by combined reduction and masking with ascorbic acid and thiosemicarbazide. Beer's law is obeyed over the range 0.4–1.6 μg/ml iron in the final solution, with a standard deviation of 0.02 μg/ml. The method has been successfully applied to determination of iron (without preseparation) in a number of non-ferrous metals and alloys, with a coefficient of variation of 1.2–5.0%.
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