Spectrophotometric determination of traces of iron, copper, zinc, aluminium and bismuth in lead- and tin-base solders and white-metal bearing alloys.
Serious co-precipitation ( > 60%) of traces of tervalent metal ions has been found to occur in the precipitation of PbSO(4). A moderate amount (approximately 11%) of Zn(2+) and an insignificant amount of Cu(2+) are also co-precipitated. To deal with this problem, for the determination of Fe (with 1,10-phenanthroline), Al (with oxine-EDTA-KCN), Bi (with diethyldithiocarbamate-EDTA-KCN), and Cu (with 2,2'-biquinoline) in lead- and tin-base solders or white-metal bearing alloys, the PbSO(4) is dissolved in tartrate solution. Zinc is determined with dithizone after the PbSO(4) has been thoroughly washed with a dilute ammonia solution.
Wang
Z
Z
Department of Chemistry, University of Missouri-Kansas City, Kansas City, Missouri 64110, U.S.A.
Cheng
K L
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