Related Experiment Video
Updated: Jun 28, 2026

A Facile Synthetic Method to Obtain Bismuth Oxyiodide Microspheres Highly Functional for the Photocatalytic Processes of Water Depuration
Published on: March 29, 2019
Ion-exchanger colorimetry-IV microdetermination of bismuth in water
Y Toshimitsu1, K Yoshimura, S Ohashi
1Department of Chemistry, Faculty of Science, Kyushu University 33, Hakozaki, Higashiku, Fukuoka, 812 Japan.
Abstract:
Ion-exchanger colorimetry for the microdetermination of bismuth(III) in water samples is described. The yellow bismuth-iodide complexes are specifically sorbed and concentrated on an anion-exchange resin in the sulphate form. The resin-phase absorbances at 492 and 700 nm are measured directly. Bismuth in the ppb-ppm range can be determined without interference, except in presence of a large amount of copper(II), silver(I) and lead(II). The detection limit is 6.4 x 10(-9)M, i.e., 1.3 ppb. The distribution ratio is larger than 10(7). It is, therefore, possible to enhance the sensitivity by increasing the sample volume. The method is useful for the determination of bismuth in natural waters and industrial effluents.
Related Concept Videos
Redox Titration: Iodimetry and Iodometry
Ion-Exchange Chromatography
Precipitation Titration: Endpoint Detection Methods
In the Volhard method, a standard excess of AgNO3 is first added to the...

