一种提高化妆品中甲醛含量检测的稳定性和灵敏度的双波长光谱方法

摘要

In this paper,a method was presented for the determination of formaldehyde in cosmetics based on a dual-wavelength spectroscopy,in which both absorbances at 414 nm and 500 nm were used.The results showed that the relative standard deviation(RSD) of the method is only 0.46%,while it is 11.5% by the single-wavelength method.The limit of quantitation(LOQ) of the dual-wavelength method is 7.4 mg/kg.The present method is sensitive and accurate,and is suitable for the the determination of low content formaldehyde in cosmetic products.%提出了一种基于双波长光谱法(以500 nm吸光度为基准并结合414 nm处的吸光度)快速测定化妆品中甲醛含量的方法.结果表明:采用单波长的计算方法(不考虑基线漂移)产生的误差时,平行试验结果之间的相对标准偏差(RSD)可达11.5%,而该方法的RSD最大仅为0.46%.同时该方法能够有效地校正扣除萃取液颜色和基线漂移的影响,且定量下限为7.4 mg/kg.该方法具有分析时间短、操作便捷、灵敏度高、结果准确的优点,适用于化妆品中甲醛的检测.