Analytical Sciences

Determination of Trace Amounts of Boron in Steels by On-line Reaction/Concentration/Separation Using an Anion-exchange Column

Chaoying SHAO* and Kazuhisa YOSHIMURA**

*College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, P. R. China
**Department of Chemistry, Faculty of Sciences, Kyushu University, Hakozaki, Fukuoka 812-8581, Japan

A method for the on-line absorptiometric determination of trace amounts of boron in steels was developed using an anion-exchange column presorbed with chromotropic acid. The on-line reaction and separation were achieved by controlling the pH in order to accelerate the complex formation in the column by 2.7 and to stabilize the complex at pH 8 for the selective elution of a 1:2 complex and its detection at 350 nm. The effects from the iron matrix in the sample were effectively removed by using EDTA as a masking agent; a low limit for boron detection (3σ) of 0.04 μg g⁻¹ was obtained.

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