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Determination of trace amounts of boron in steels by on-line reaction/concentration/separation using an
Chaoying Shao1, Kazuhisa Yoshimura
1College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai, P. R. China. shaocy@dhu.edu.cn
Abstract:
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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