title: An evaluation of four titrimetric methods for the determination of lead in ores.
abstract: Four titrimetric methods for the determination of lead in ores were evaluated. In the absence of bismuth and indium, a method based on EDTA titration of lead, after chloroform extraction of lead diethyldithiocarbamate, yields accurate and more precise results than the other methods evaluated. Interference from indium can be avoided by di-isopropyl ether extraction of its bromide from 6M hydrobromic acid. Interference from bismuth can be eliminated by separating it from lead by chloroform extraction of its xanthate from 2M hydrochloric acid-tartaric acid media.
authors.affiliation: Mineral Sciences Laboratories, Canada Centre for Mineral and Energy Technology, Department of Energy, Mines and Resources, Ottawa, Canada.
authors.forename: E M
authors.initials: EM
authors.lastname: Donaldson