[article]
| Titre : |
The composition analysis of organic acid masked aluminium tannig solutions by ferron assay and GFC |
| Type de document : |
texte imprimé |
| Auteurs : |
Keyi Ding, Auteur ; Jun Liu, Auteur ; Tingyou Zhang, Auteur |
| Année de publication : |
2006 |
| Article en page(s) : |
p. 260-265 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Index. décimale : |
675.2 Préparation du cuir naturel. Tannage |
| Résumé : |
Earlier theoretical assumptions were that, in tanning solutions, aluminum formed linear polymeric complexes similar to chromium with a maximum of four Al3+ nuclei in a complex. In this paper, the sizes of aluminum complexes, composition distribution and coordination of organic acid anions with Al3+ nuclei were determined by ferron assay, gel filtration chromatography (GFC) and low-pressure ion chromatography (LPIC). The results were as follows: (1) In the pH range of aluminum tanning process (pH=2.5-5.0), two types of organic acid masked aluminum complexes were found: Ala, mononuclear complexes, and Alb, polymeric complexes (small polymeric complexes containing 2-4 Al3+ nuclei, as well as larger "Al13 like" complexes). The percentage of Alb increased dramatically when pH was increased from 3.0 to 4.0, with more than 80% of the total Al3+ in this state at pH ≥3.5. (2) In organic acid masked aluminum salt solutions, most of the added organic acid anions were in "free" state, i.e., they were not coordinated with Al3+ nuclei. (3) In solutions of citrate masked aluminum sulfate, whatever the dose of citrate, the first elution fractions had unusually large values of [Al3+]/[Cit], some greater than 30. These results suggest that there might be something about the structure of aluminum complexes in tanning solutions that earlier theoretical assumptions did not consider. The results of this paper may provide some theoretical and practical guidance for a better understanding of the mechanism of aluminum tanning or aluminum combination tanning with other tannins. |
| En ligne : |
https://drive.google.com/file/d/1wPo2jvvOOl9S4hrvhOJsPRrNE6ALYfAG/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3995 |
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CI, N° 7 (07/2006) . - p. 260-265
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The composition analysis of organic acid masked aluminium tannig solutions by ferron assay and GFC in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 7 (07/2006)
