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%.

SampleConcentration
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 1582 ± 0.2542 ± 0.3365 ± 0.4216 ± 0.5
Hair shampoo 1478 ± 0.5438 ± 0.4280 ± 0.5155 ± 0.6

All values are means ().