Multi-element method for determination of elements in cosmetics by ICP-OES
Abstract:With people understanding the harmful elements, more and more consumers begin to pay attention to the content of the harmful elements in cosmetics. Now our country has established standard detection methods about Pd、As、Hg which are in cosmetics. After cosmetic SK-Ⅱ was reported it has harmful elements Cr and Ru, the inspection department sets dozens of limit elements, this makes Multi-element method for determination of elements in cosmetics by ICP-OES become hot.
In this article, we use ICP-OES determination of As、B、Be、Bi、Cd、Cr、Fe、Ni、Pb、Sb、Sr、Ti、Tl、V and Zn. The analytical conditions and parameters of ICP-OES were optimized, The detection limits of As、B、Be、Bi、Cd、Cr、Fe、Ni、Pb、Sb、Sr、Ti、Tl、V、Zn were 0.1992,0.0037,0.0009,0.1345,0.0311,0.0177,0.0269,0.2921,0.2626,0.2394,0.0010,0.0094,0.1275,0.0525,0.0170μg/ml respectively. The linear range was 0~5 ppm, the linear regression equations of the 15 elements were y=96.78x+21.12,y=5595.54x+91.19,y=159294.41x+23.37,y=161.70x+20.83,y=1974.57x+26.84,y=1429.99x+28.99,y=2350.25x+59.59,y=298.96x+33.87,y=119.95x+33.79,y=142.55x+41.38,y=523659.2x+230.40,y=12708.85x+52.140,y=144.61x+56.67,y=919.03x+34.39,y=2354.916x+56.659 respectively, and the linear correlation might be up to 0.9995 . At last, we use tow kinds of methods——ICP-MS and ICP-OES analysis samples, then look for the difference.
Keywords:Inductively coupled plasma emission spectrometry; Cosmetics; Harmful metal elements; Digestion