Determination of lead in cosmetics using atomic absorption spectrophotometry
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Abstract
Introduction: This study investigated the level of lead (Pb), a heavy metal which was possible to contaminate in cosmetic samples. All samples were classified into four groups; eye shadow, hair dye, eye linear and beauty soap. Announcement of The Ministry of Public Health (the component name not to be used as an ingredient in cosmetics), BE2559 (2016), Thailand, indicated that the safety level for lead contamination should not be higher than 20 ppm by weight. The technique for this studied was atomic absorption spectrophotometric method. Methods: The cosmetic samples were prepared using digestion technique with nitric acid. The clear solution of digested samples was determined for lead (Pb) level by investigating light absorption of lead free atom. The appropriate wavelength was at 283.31 nm. The calibration curve was linear over the range of 0.25 V 3.0 μg mL-1 lead standard solution. These samples were analyzed triplicate. Results: From 80 cosmetic sample, it was found that the highest average lead level obtained from eye shadow sample. The lead levels was shown in the range of 1.58 V 17.53, V 0.001.19, 0.00 V 7.07 and 0.05 V 1.17 μg g-1 for eye shadow, hair dye, eye linear and beauty soap, respectively. The average lead level were found to be 4.88, 0.30, 1.07 and 0.64 μg g-1 for eye shadow, hair dye, eye linear and beauty soap, respectively. Conclusion: All lead levels in this study were not higher than the safety limit of announcement from The Ministry of Public Health, Thailand.
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References
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