Improved Solid-phase Spectrophotometry for the Microdetermination of Chromium(VI) in Natural Water

Saputro, Sulistyo and YOSHIMURA, Kazuhisa and MATSUOKA, Shiro and TAKEHARA, Kô and Narsito, (2009) Improved Solid-phase Spectrophotometry for the Microdetermination of Chromium(VI) in Natural Water. ANALYTICAL SCIENCES, 25. pp. 1445-1450.

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Abstract

A simple and sensitive solid-phase spectrometry procedure was improved for the microdetermination of Cr(VI). A 0.06 cm3 portion of a cation excharger, Muromac AG 50W-X2, was used to concetrate the target Cr(VI) in a 20 cm3 water sample, and resin beads were introduced in a flow cell of 1.5 mm diameter and having a 10 mm light path length for measurements using a UV-visible spectrophotometer. There lenses were used for focusing the incident light beam and for recovering light scattered by the solid phase in the cell. The sensitivity achieved was higher by a factor of 277 compared with that of solution method, and the detection limit was 0.014 ug dm-3. The recovery on spiked real water samples by the standard addition method was 96 - 101%. Favorable working and performance characteristics made it possible to directly determine sub-ug dm-3 amounts of Cr(VI) in natural water samples.

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