称取混合均匀的防晒类化妆品样品0.200 0 g于50 mL具塞比色管中，用甲醇-四氢呋喃-水-高氯酸（350+550+100+0.067）溶液溶解，超声提取30 min，移取2.0 mL上述溶液，用甲醇-四氢呋喃-水-高氯酸（250+450+300+0.2）溶液稀释至10.0 mL，经0.45 μm滤膜过滤，弃去初虑液至少2 mL，取续虑液作为待测液。采用高效液相色谱法测定其中20种防晒剂的含量，利用二极管阵列检测器检测。结果表明：20种防晒剂的质量浓度在一定范围内与其对应的峰面积之间呈线性关系，检出限（3S/N）在0.006 0~0.28 mg·L^-1之间。以阴性防晒剂化妆品样品为基质，按照标准加入法进行回收试验，回收率在93.2%~107%之间，测定值的相对标准偏差（n=6）在0.10%~1.7%之间。

0.200 0 g of sunscreen cosmetics were taken and dissolved with methanol-tetrahydrofuran-water-perchloric acid (350+550+100+0.067) solution in the 50 mL of colorimetric tube with plug. And then extracted ultrasonically for 30 min, remove 2.0 mL of the above solution and diluted it with methanol-tetrahydrofuran-water-perchloric acid (250+450+300+0.2) solution to 10.0 mL. The mixture was filtered through a filtering membrane of 0.45 μm, at least 2 mL of the primary filtrate was discarded and the secondary filtrate was taken as the liquid to be tested. The contents of 20 sunscreens were determined by high performance liquid chromatography and detected by diode array detector. As shown by the results, linear relationships between values of peak area and mass concentration of the 20 sunscreens were found in the definite ranges, with detection limits (3S/N) in the range of 0.006 0-0.28 mg·L^-1. Test for recovery by standard addition method was made on the base of negative sunscreen cosmetic sample, giving results in the range of 93.2%-107%, and RSDs (n=6) ranged from 0.10% to 1.7%.