ベリロンIIIを用いた吸着ストリッピングボルタンメトリーによる鉄鋼中微量ほう素の定量(分析・解析)

概要

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Adsorptive stripping voltammetry is proposed for the determination of boron at the low μg g^<-1> level in iron and steel. Beryllon III was used as a complexing agent for boron(III). Optimum conditions for a complex formation of boron(III)-Beryllon III complex were as follows: 0.06M nitrate-0.04M sulfate supporting electrolyte at pH 4.5; 1.0×10^<-5> M Beryllon III; 24h complexation time. The complex was accumulated on a hanging mercury drop electrode at -0.35V for 60s under stirring, and subsequently was cathodically stripped to -0.8V at a scan rate of 10mVs^<-1> by using a differential pulse mode. The interference of iron(III) was eliminated by complexing it with metaphosphoric acid. The cathodic stripping resulted in only a single well-defined peak around -0.5V. The influence of foreign elements on the determination was evaluated. The calibration graph (peak height vs. boron(III) concentration) in the presence of 1 mg mL^<-1> iron(III) was linear over the 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 1μg g^<-1> of boron in iron and steel. The proposed method could be applied 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
2005-07-01