Abstract:

Thirty batches of lipsticks sampled from twenty-seven districts in Gansu province were tested by microwave digestion coupled with ICP-MS. The types and concentrations of metal elements in lipsticks were determined separately by online internal standard calibration and external standard method. The detection limit of the instruments was 0.000 11~1.6 μg/L in the range of 0~100 μg/L （Hg: 0~5 μg/L）. When the constant volume was 25 mL and the theoretical quantity of the sample was 0.3 g, the detection limit of the method was 0.000 009 2~0.13 mg/kg; the linear correlation coefficients were all greater than 0.995 1; the recoveries of spiked samples were 81.8%~120.0%; the relative standard deviations （RSD） were less than 5%. The test results showed that this method was simple, rapid, time-saving, cost-saving and accurate and had good reproducibility in the simultaneous analysis of various elements in lipsticks.

Key words: lipstick, cosmetics, metal element, microwave digestion, ICP-MS