کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1247382 | 969828 | 2006 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Polarographic determination of sunscreen agents in cosmetic products in micellar media Polarographic determination of sunscreen agents in cosmetic products in micellar media](/preview/png/1247382.png)
This paper introduces a simple, fast and reliable electroanalytical method for differential-pulse polarography based on electrochemical reduction at a dropping mercury electrode. The method was validated for the determination of 2-ethylhexyl-4-methoxycinnamate (EHMC) alone and in association with 4-methylbenzylidene camphor (MBC) or 2-hydroxy-4-methoxybenzophenone (BENZ-3) in samples of commercial cosmetic preparations. The supporting electrolyte that provided the best-defined and most intense peak current for EHMC determination was Britton-Robinson buffer (pH 4.0) in the presence of a cationic surfactant. Under optimized conditions, EHMC exhibited one single peak of reduction at −1.49 V versus Ag/AgCl. A limit of detection of 3.76 × 10−8 mol L−1 and a limit of quantitation of 1.25 × 10−7 mol L−1 were found for the pure EHMC standard. A good average recovery rate was reached for all the samples analyzed.
Journal: Talanta - Volume 68, Issue 3, 15 January 2006, Pages 679–685