Method for Quantitative Determination of Dibutylphosphoric Acid in Solutions of Tributyl Phosphate in Synthine

摘要

A method is proposed for the quantitative determination of dibutylphosphoric acid (DBP) in industrial solutions containing synthine sulfonation products. The method involves the following steps: (1) specimen to be analyzed is first treated with barium chloride and chloroform at pH of 5.45 to 5.55; (2) organic phase is discarded and aqueous layer is treated with hydrochloric acid and tributyl phosphate-hydrogenated synthine solution; (3) aqueous phase is discarded and organic phase is rinsed with hydrochloric acid saturated with ethylenediaminetetraacetic acid, buffer solution and chloroform; (4) aqueous layer is separated and treated with safranine and chloroform; (5) chloroform layer is removed, and anhydrous sodium sulfate added to it and mixture is shaken to complete dehydration of the chloroform extract; and (6) spectrophotometry of chloroform extract. The reliability and reproducibility of this method was substantiated by analysis of an industrial solution containing 100 mg/liter DBP; 101 +- 2 mg/liter was found with 95% reliability. (ERA citation 07:054579)