title: Novel flow injection-fluorometric method for the determination of trace silicate and its application to ultrapurified water analysis.
abstract: A highly sensitive fluorescence quenching method for the determination of silicate based on the formation of an ion associate between molybdosilicate and Rhodamine B (RB) in nitric acid medium was developed. A flow injection system coupled with a fluorescence detector was used for the measurement of fluorescence intensity at 560 and 580 nm as excitation and emission wavelengths, respectively. The calibration graph for Si showed a linear range of 0.1-5 ng cm(-3) with correlation coefficient of 0.9999, and the detection limit of 0.06 ng cm(-3). The proposed method was successfully applied to the determination of silicate in ultrapurified water with satisfactory results.
authors.affiliation: Department of Chemistry, Faculty of Science, Okayama University, 3-1-1 Tsushimanaka, Okayama, Japan.
authors.forename: Akhmad
authors.initials: A
authors.lastname: Sabarudin
authors.forename: Mitsuko
authors.initials: M
authors.lastname: Oshima
authors.forename: Naoe
authors.initials: N
authors.lastname: Ishii
authors.forename: Shoji
authors.initials: S
authors.lastname: Motomizu