Spectrophotometric determination of perchlorate after extraction as protriptylinium perchlorate

Perchlorate (0–75 μg) can be determined spectrophotometrically at 292 nm after extraction of protriptylinium perchlorate into ethyl acetate. The effects of pH and diverse anions are reported. The system has been applied to the determination of perchlorate in samples of potassium chlorate after prior selective destruction of chlorate.