A Simple and Rapid Determination Method of Boron in Wastewater Using Ion-Selective Electrode.

概要

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A simple and rapid determination method of boron concentration in wastewater using an ion-selective electrode has been developed. By adding H2SO4and HF to a H3BO3 solution, H3BO3is converted to BF4-, which can be measured with a commercial BF4-ion-selective electrode. The BF4-formation rate obeys the first-order kinetics with respect to the H3BO3 concentration. Approximately 1 hour is usually required for the complete conversion of H3BO3to BF4-. The authors found that by applying the rate equation to a BF4-profile in the initial 10 min of the reaction, the original boron concentration in wastewater can be determined from the curve fitting, which leads to a considerable reduction in the measurement time. They also found that NaF can replace toxic HF as a fluorine source in the determination. The proposed method can detect a range of 1-300 mg-B dm-3without any pretreatments; this range covers the Japanese wastewater standards for boron.
日本環境化学会の論文