Research Article
Determination of Very Low Level of Free Formaldehyde in Liquid Detergents and Cosmetic Products Using Photoluminescence Method
Table 7
Tolerable concentrations of foreign species for determination of 1 × 10−6 M formaldehyde.
| Foreign ion | Tolerable concentration (M) | Tolerable limit ((species)/(HCOH)) | Relative error (%) |
| Na+, | | 100000 | −2.7 | Mg2+ | | 1000 | 4.1 | Ca2+ | | 1000 | −3.8 | Benzaldehyde | | 1000 | −2.3 | Propionaldehyde | | 500 | 2.6 | Acetaldehyde | | 500 | 2.9 | Ni2+ | | 100 | 3.6 | Pb2+ | | 100 | −3.8 | Cd2+ | | 100 | 4.1 | Fe+3 | | 50 | 2.7 |
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