摘要
为建立一个新的测定化妆品中铅的分光光度法,在0.24 mol/L的磷酸介质中,铅与DBM-MSA{3-[(2-磺酸基苯)偶氮]-6-[2,6-二溴-4-甲基苯)偶氮]-4,5-二羟基-2,7-萘二磺酸}反应形成1:2的蓝色配合物,在波长630 nm处比色测定。结果表明,铅量在0～1μg/mL范围内符合比耳定律;样品测定的相对标准偏差为1.24%～4.59%,标准加入回收率为95.0%～107.0%,化妆品中共存物质不干扰测定,方法简便,选择性好,结果满意。
To establish a new method for the determination of lead in cosmetics with dibromo - p - methyl - methylsulfonazo, in 0. 24 mol/L H3PO4 medium, lead reacts with the reagent to form a blue complex, which has a composition of 1 ： 2 and could be measured at wavelength 630nm by spectrophotometry. The results show that Beer＇s law is obeyed for 0 - 1 μg/mL of lead in of solution. The relative standard deviation for determination of samples were found in the range of 1.24% -4. 59%. The standard addition recovery of Lead is between 95.0%-107.0%. No interference was observed from coexistent substances in cosmetics. It concludes the method is simple, good selectivity and satisfied with determination lead in cosmetics.
出处
《广东微量元素科学》
CAS
2009年第11期63-66,共4页
Trace Elements Science
关键词
分光光度法
化妆品
铅
spectrophotometry
cosmetic
lead
