用于化妆品的固体进样-半定量汞速测仪的研制

Development of Semi-quantitative Solid Sampling Mercury Analyzer for Cosmetics

研制了基于汞(Hg)和碘化亚铜(CuI)显色反应的固体直接进样半定量汞速测装置,由催化加热炉、测汞管、空气泵和拍照组件构成。采用101白色担体作为CuI的吸附剂,通过固体直接进样方式导入化妆品样品,既可肉眼辨识Hg超标的显色强度,又可利用智能手机的摄像和RGB分析软件快速半定量分析化妆品中Hg含量。此装置对Hg的检出限为50 ng,线性范围为50~2500 ng,线性回归系数(R^2)>0.97,重复测定RGB值的RSD为6%(n=11)。对化妆品实际样品的测定结果表明,本研究的仪器方法与《化妆品安全技术规范》(2015版)中汞分析仪法所得结果的相对偏差≤10%,分析时间在5 min内,方法快捷、方便、准确、直观,可用于化妆品中Hg的现场快速筛查。

On the basis of the chromogenic reaction between Hg and CuI, a semi-quantitative solid samplingHg analyzer comprising the catalytic furance, Hg testing tube, air pump and smart cellphone was developed.White carrier 101 was chosen as the adsorbent for CuI to react with Hg from the catalytic furnace. Theestablished Hg analyzer can not only visually recognize the coloration when Hg exceeding the limit standard,but also semi-quantitatively detect the Hg content in cosmetics fast using a smart cellphone and RGB analysissoftware, after direct solid sampling introduction of cosmetics sample. The instrumental detection limit （LOD）of mercury was 50 ng, the linearity ranged from 50 ng to 2500 ng, the linear regression coefficient （R2） washigher than 0. 97, and the RSD of the corresponding RGB values was 6% （ n = 11）. Nine real cosmeticssamples were measured by the established method, whose relative differences of Hg contents with that by thestandard method （Safety Technical Specification for Cosmetics, 2015 edition） were less than 10%. The wholeanalytical time can be controlled within 5 min. The established instrumental method is simple, fast, accurateand visual, and extremely suitable to fast and on-site monitoring of Hg in cosmetics samples.