Research Article
Determination of Very Low Level of Free Formaldehyde in Liquid Detergents and Cosmetic Products Using Photoluminescence Method
Table 6
Determination of formaldehyde in dishwashing liquid and hair shampoo in various times after production with confidence limit 95%.
| Sample | Concentration after one week from production (ppm) | Concentration after one month from production (ppm) | Concentration after six months from production (ppm) | Concentration after nine months from production (ppm) |
| Dishwashing liquid 1 | 582 ± 0.2 | 542 ± 0.3 | 365 ± 0.4 | 216 ± 0.5 | Hair shampoo 1 | 478 ± 0.5 | 438 ± 0.4 | 280 ± 0.5 | 155 ± 0.6 |
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All values are means ().
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