Determination of boron in river-water by ICP-AES coupled with anion-exchange preconcentration

• Published in: BUNSEKI KAGAKU Vol. 50; no. 3; pp. 203 - 208
• Main Authors: YOSHIKUNI, Nobutaka, SEKI, Yutaka, IWATSUBO, Kenji, OGUMA, Koichi
• Format: Journal Article
• Language: Japanese
• Published: The Japan Society for Analytical Chemistry 05.03.2001
• Subjects: boron; ICP-AES; ion exchange
• ISSN: 0525-1931
• DOI: 10.2116/bunsekikagaku.50.203

Trace amounts of boron in river-water samples were determined by a combined method of anion-exchange preconcentration and ICP-AES. A river-water sample was acidified to 0.1 mol dm-3 or 0.2 mol dm-3 with hydrofluoric acid. The sample was permitted to stand for 1 h and then passed through an anion-exchange column(Bio-Rad, AG1-X8, 100∼200 mesh, F form, 3 g) at a flow rate of about 1 cm3 min-1. The boron adsorbed on the ion exchange column was washed with 20 cm3 of 1 mol dm-3 nitric acid, and then eluted with 20 cm3 of 6.5 mol dm-3 nitric acid. After the effluent was collected in a 100 cm3 quartz beaker, 10 cm3 of 1.47 mol dm-3 H3PO4 was added and evaporated to about 2 cm3 on a hotplate. Any organic materials in the effluent were decomposed with mixed H3PO4-HClO4-HNO3. The content in the beaker was then transfered a 25 cm3 PTFE standard flask, and diluted to the mark with water. The boron contents were determined by ICP-AES(182.6 nm). The present method was successfully applied to the analysis of standard reference materials(JAC0032) and to samples from Doshi river. The determination of boron in the standard reference materials showed good agreement and precision with already published values. The boron contents in the upper, middle and lower reaches in the river were 3.5±0.1 μg/l (n=3), 5.1±0.1 μg/l (n=6) and 9.4±0.6 μg/l (n=4), respectively.