Research Article
Development and Validation of a Method for the Analysis of Zinc Oxide in Cosmetic Matrices by Flame Atomic Absorption Spectroscopy
Table 3
ZnO content in samples of lipstick, foundation, and emulsion products.
| Sample | Average found concentration (% w/w ± SD) |
| Lipstick 1 | 3.5341 ± 0.0137 | Lipstick 2 | 3.5994 ± 0.0058 | Lipstick 3 | 3.541 ± 0.0001 |
| Foundation 1 | 8.7116 ± 0.0311 | Foundation 2 | 8.8452 ± 0.0062 | Foundation 3 | 8.8172 ± 0.0241 |
| Emulsion 1 | 3.8630 ± 0.0030 | Emulsion 2 | 3.7872 ± 0.0001 | Emulsion 3 | 3.7656 ± 0.0192 |
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