Abstract：SPF and PA index present the resistance ability of sunscreen to UVA (Ultraviolet A) and UVB (Ultraviolet B) respectively. The present article focuses on the research on the relationship between ultraviolet transmittance and sunscreen ability based on definition of sunscreen efficiency and a simple and significant result was obtained by deducing. The technique we applied is spectral analysis dealing with ethanol-ethyl ether mixed solvent by ultraviolet and visible light spectrophotometer. We measured the UVA and UVB transmittance of 69 common sunscreen samples. The measurement result shows that spectral analysis method could differentiate sunscreens with different SPF and PA and identify whether the parameter value marked is accurate. So, an effective method is provided for the measurement of SPF and PA value. If different types of ultraviolet absorbent or UV scattering dose is added in sunscreen, the authors can distinguish them easily through the shape of the transmittance curve. In our sunscreen samples measured, domestic brands and imported brands are classified into two categories. By comparing the experimental results, the authors found that the domestic sunscreen and import sunscreen have no significant difference in sun block efficiency as long as the authors adopt the product of qualified manufacturer.
曹小华，肖 铎 . 防晒霜紫外线透光率的测定及防晒效果分析 [J]. 光谱学与光谱分析, 2013, 33(11): 3098-3100.
CAO Xiao-hua, XIAO Duo . Measure of Sunscreen Cream Transmittance in UV Wave Range and Analysis of Sun Protection Effect. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2013, 33(11): 3098-3100.
[1] Farman J C, Gardiner B C, Shamklin J D. Nature, 1985, 315: 207. [2] ZHANG Fu-xing, WANG Jian-qiu, KUANG Dai-zhi, et al(张复兴，王剑秋，邝代治，等). Chinese Journal of Inorganic Chemistry(无机化学学报), 2012, 28(6): 1195. [3] Yang Y, Zhao K Q, Yu W H, et al. Key Eng. Mater., 2010, 135: 428. [4] YANG Qiong-fen, NIE Han, CHEN Zi-ran, et al(杨琼芬，聂 汉，陈自然，等). Acta Phys. Sin.(物理学报), 2012, 61(6): 063102. [5] XU Hui-hui, SU Jin，SONG Wei-min，et al(许慧慧，苏 瑾，宋伟民, 等). Shanghai Journal of Prevent Medicine(上海预防医学)，2002，14(7)：315. [6] HU Guo-xian, CHEN Yi-zhao, LIAN Hong-zhou, et al(朱国贤, 陈毅昭, 连洪州, 等). Chinese Journal of Inorganic Chemistry(无机化学学报), 2012, 28(1)：8.
