Determination of Trace Boron in Iron and Steel by Adsorptive Stripping Voltammetry using Beryllon III

概要

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Adsorptive stripping voltammetry is proposed for determination of boron at low μg g−1 level in iron and steel. Beryllon III was used as a complexing agent for boron(III). Optimum conditions for the formation of the boron(III)–Beryllon III complex were as follows: 0.06 M nitrate–0.04 M sulfate supporting electrolyte at pH 4.5; 1.0×10−5 M Beryllon III; 24 h complexation time. The complex was accumulated on a hanging mercury drop electrode at −0.35 V vs. SCE for 60 s under stirring, and was subsequently cathodically stripped to −0.8 V vs. SCE at a scan rate of 10 mV s−1 using a differential pulse mode. Interference by iron(III) was eliminated by the complexation with metaphosphoric acid. After cathodic stripping, a single well-defined peak was observed at around −0.5 V vs. SCE. The influence of foreign elements on the determination was also evaluated. The calibration graph (peak height vs. boron(III) concentration) in the presence of 1 mg mL−1 iron(III) was linear over a concentration range of 1–25 ng mL−1 (correlation coefficient >0.999), with a relative standard deviation (n=4) of 2.6% at 10 ng mL−1. The minimum limit of determination was 1 μg g−1 of boron in iron and steel. The proposed method has been proved to be applicable to the determination of trace boron in iron and steel with good precision and accuracy.
社団法人日本鉄鋼協会の論文
2006-09-15