Direct spectrophotometric determination of iron in non-ferrous alloys.
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 mug/ml iron in the final solution, with a standard deviation of 0.02 mug/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%.
Nan
Z
Z
Shanghai Research Institute of Materials, SCMI, Shanghai, People's Republic of China.
Yuan-Xiang
G
G
Qing
G Y
GY
Xu-Zhang
Y
Y
Zhi-Ren
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L