SIMULTANEOUS DIFFERENTIAL DETERMINATION OF MIXED ORGANIC AND INORGANIC ACID BY NONAQUEOUS CONDUCTOMETRIC TITRATION WITH SODIUM TETRAHYDROBORATE

This study concerned the simultaneous differential determination of mi xed inorganic and organic acid by nonaqueous conductometric titration with sodium tetrahydroborate, which was dissolved in N,N-dimethylforma mide (DMF). The inflection points were found on conductometric titrati on curves of a mixed solution of organic and inorganic acid in DMF; th ey were caused by a difference in the acidity or reactivity. The acid concentration of each of mixed acid was successfully determined simult aneously by the present method. We attempted to identify the ions in t he DMF solution and the resulting precipitates during the course of ti tration by fast atom bombardment mass spectrometry (FAB-MS) and fourie r-transform infrared spectroscopy (FT-IR). The determination limit was about 0.01 M by this method.