title: Use of long-chain alkylamines for preconcentration and determination of traces of molybdenum, tungsten and rhenium by atomic-absorption spectroscopy-II: molybdenum in soils, sediments and natural waters.
abstract: Molybdenum is extracted as the thiocyanate complex with the quaternary long-chain aliphatic amine Aliquat 336 in chloroform, followed by evaporation of the solvent, dissolution in MIBK, and atomic-absorption spectroscopy. The method is simple, rapid and sensitive, with few interference problems for the determination of the Mo content of soils and sediments in the range 0.1-1.0 ppm with a relative standard deviation better than 5% when 1-g samples are used. Quantitative extraction from large volumes of aqueous solution has also been confirmed, allowing the determination of Mo in natural waters in the ppM range.
authors.affiliation: Department of Analytical Chemistry, University of New South Wales, P.O. Box 1, Kensington, N.S.W. 2033, Australia.
authors.forename: C H
authors.initials: CH
authors.lastname: Kim
authors.forename: P W
authors.initials: PW
authors.lastname: Alexander
authors.forename: L E
authors.initials: LE
authors.lastname: Smythe