Determination of Very Low Level of Free Formaldehyde in Liquid Detergents and Cosmetic Products Using Photoluminescence Method

Table 2

Optimized parameters for derivatization reaction of formaldehyde.

Name of variable	Coded optimized values	Actual optimized values
Reaction time ()	−0.47	7.05
Ethanol ()	0.506	25.3
Acetate ammonium ()	0.72	2.2
2-Methyl acetoacetanilide ()	0.42	0.06
Temperature ()	−0.31	27