Solid-Phase Spectrophotometric Determination of Beryllium at ng mL−1

Abstract

A microdetermination method at ng mL⁻¹ level for beryllium by solid-phase spectrophotometry was been developed. Chrome Azurol S was used as chromogenic reagent to form a blue complex which was easily and strongly sorbed and concentrated on a dextran-type anion-exchange resin. The resin-phase absorbances at 594- and 800 nm were measured directly. Beryllium could be determined over the 1.5 - 15.0 ng mL⁻¹ range with a RSD of 2.7 % by using 100 mL of sample solution. The detection limit was 0.21 ng mL⁻¹. By using only 10 mL of sample solution, the calibration graph was linear over the concentration range 10–85 ng mL⁻¹, the RSD being 1.2 %. The method was applied to the determination of beryllium in underground and mining waste water samples and in beryl mineral.