titation were 0.002 mg mL−1 (S/N = 3) and 0.006 mg mL−1 (S/N = 10), respectively. The average recoveries
at the spiked levels of 0.125, 0.250 and 0.500 mg mL−1 were 96.9%, 102.3% and 94.0% with the rela- tive standard derivations of 2.1%, 3.9% and 2.2%, respectively. The method was cross-validated by both high performance liquid chromatographic and ion chromatographic method. Eighty-five commercial depilatory creams and hair-treatment products were analyzed with satisfactory results.
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