| Titre : |
Determination of free formaldehyde in leather chemicals |
| Type de document : |
texte imprimé |
| Auteurs : |
Yudan Yi, Auteur ; Wei Ding, Auteur ; Ya-Nan Wang, Auteur ; Bi Shi, Auteur |
| Année de publication : |
2019 |
| Article en page(s) : |
p. 382-390 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Agents de tannage
Chimie analytique
Cuir -- Teneur en formaldéhyde
Polyamines
Produits chimiques -- Teneur en formaldéhyde
Retannage
|
| Index. décimale : |
675 Technologie du cuir et de la fourrure |
| Résumé : |
Formaldehyde is widely used in the synthesis of various leather chemicals due to its high reactivity and low cost. It is probably introduced into leather when applying the chemicals to processing, and then released during storage and use of leather, which may pose a potential risk to human health. Existing method for determining formaldehyde in leather is helpless to deal with the complicated chemicals. In this study, a method was optimized for determination of free formaldehyde in leather chemicals based on ISO 27587. A 0.5-2.0 g sample of leather chemical (formaldehyde could range from 1.25 to 1250 mg/kg) was heated at 90°C in nitrogen atmosphere. The released formaldehyde was purged at a flow rate of 300 mL/min for 30 min, captured and derivatized using a bubble absorption tube containing 2,4-dinitrophenylhydrazine absorption solution, and then detected by HPLC-diode array detector. The recovery rate of formaldehyde standard solution was 91.0% with relative standard deviation (RSD) of 4.87% in seven times repeated trials. The repeated determinations of aldehyde tanning agents showed the formaldehyde recoveries higher than 90% and RSD lower than 7%, indicating the accuracy and precision of the method. Powdery amino resins were determined to contain a tiny amount of free formaldehyde using this method. However, it should be noted that hydrolyzed formaldehyde will be formed when the amino resins were dissolved in water and used in retanning, leading to the potential for bringing leather with high content of formaldehyde. |
| Note de contenu : |
- EXPERIMENTAL : Materials - Determination of formaldehyde in leather chemicals - Effects of extraction conditions on the determination of formaldehyde - Effect of derivative devices on the determination of formaldehyde - Determination of formaldehyde in amino resin and leather
- RESULTS AND DISCUSSION : Effect of extraction conditions on the determination of formaldehyde - Validation parameters of the proposed method - Effect of derivative devices on the determination of formaldehyde - Determination of formaldehyde content in amino resins and retanned leather |
| En ligne : |
https://drive.google.com/file/d/1ovkzKqph88a5PaXbxWN0an2EWrZffTZZ/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33034 |
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIV, N° 10 (10/2019) . - p. 382-390
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Determination of free formaldehyde in leather chemicals in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 10 (10/2019)
