| A liquid chromatography-inductively coupled plasma mass spectrometric(LC-ICP-MS) method was established for the determination of chromium(Ⅵ) and chromium(Ⅲ) stripped from stopcock.By investigating pH value,ICP-MS operation conditions and parameters,the detection limits of chromium(Ⅵ) and chromium(Ⅲ) were obtained to be 0.013 μg/L and 0.028 μg/L，respectively.Linear ranges of chromium(Ⅵ) and chromium(Ⅲ) were 0.02-10 μg/L and 0.04-20 μg/L，respectively.The spiked recoveries varied from 76.0% to 116.4%,with RSDs of 1.8%-2.8%.The method is fast and accurate,and has a low detection limit.It is suitable for the detection requirement of stopcock products. |