title: Preconcentration of gallium by coprecipitation with synthetic zeolites prior to determination by electrothermal atomic absorption spectrometry.
abstract: Synthetic zeolites were dissolved in nitric acid, and the resulting solution used as a coprecipitant for the preconcentration of trace amounts of gallium in water samples prior to determination by electrothermal atomic absorption spectrometry (ETAAS). The gallium preconcentration conditions and the ETAAS measurement conditions were optimized. Gallium was quantitatively concentrated with the zeolites coprecipitate from pH 6.0 to 8.0. The coprecipitate was easily dissolved in nitric acid, and an aliquot of the resulting solution was introduced directly into a tungsten metal furnace. The atomic absorbance of gallium in the resulting solution was measured by ETAAS. An ashing temperature of 400 degrees C and an atomizing temperature of 2600 degrees C were selected. The calibration curve was linear up to 3.0 microg of gallium and passed through the origin. The detection limit (S/N > or = 3) for gallium was 0.08 microg/100 cm3. The relative standard deviation at 1.0 microg/100 cm3 was 3.0% (n = 5). The proposed method has been successfully applied to trace gallium analysis in environmental water samples.
authors.affiliation: Department of Basic Science, High Technology Research Center, College of Industrial Technology, Nihon University, Shin-ei, Narashino, Chiba 275-8576, Japan.
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Minamisawa
authors.forename: Shinpei
authors.initials: S
authors.lastname: Iizima
authors.forename: Mayumi
authors.initials: M
authors.lastname: Minamisawa
authors.forename: Satoshi
authors.initials: S
authors.lastname: Tanaka
authors.forename: Nobumasa
authors.initials: N
authors.lastname: Arai
authors.forename: Masami
authors.initials: M
authors.lastname: Shibukawa