Determination of traces of perchlorate in chlorate solutions.
Perchlorate present in chlorate solutions is determined gravimetrically as tetraphenylphosphonium perchlorate after destruction of chlorate by addition of hydrochloric acid. Interference of Fe(III) and Cr(III) is prevented by complexing with tarartic acid. Replicate analyses of a sodium chlorate solution containing NaClO(3), NaCl, Na(2)Cr(2)O(7), and 390 ppm NaClO(4) showed 405 ppm NaClO(4) (standard deviation 19 ppm, 12 results).
Fuhrman
D L
DL
PPG Industries Inc., Chemical Division, P.O. Box 4026, Corpus Christi, Texas 78408, U.S.A.