2024 - Sustainable Industrial Processing Summit
SIPS 2024 Volume 16. Intl. Symp on Electrochemistry, Molten Salts, Corrosion, Recycling and Battery
| Editors: | F. Kongoli, C.A. Amatore, R. Fehrmann, G. Kipouros, I. Paspaliaris, G. Saevarsdottir, R. Singh, R. Gupta, M. Halama, D. Macdonald, F. Wang, M. Barinova, F. Ahmed, C. Gaidau, X. Guo, K. Kolomaznik, H. Ozgunay, K. Tang, N.N. Thanh, S. Yefremova, K. Aifantis, Z. Bakenov, C. Capiglia, V. Kumar, A. U. H. Qurashi, A. Tressaud, R. Yazami |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2024 |
| Pages: | 243 pages |
| ISBN: | 978-1-998384-34-1 (CD) |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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THE TWO FACES OF CHROME
Karel Kolomaznik1; Juan Carlos Beltran-Prieto2; Michaela Barinova1;1TOMAS BATA UNIVERSITY IN ZLIN, Zlin, Czech Republic; 2TOMAS BATA UNIVERSITY IN ZLIN, FACULTY OF APPLIED INFORMATICS, ZLIN, Czech Republic;
Type of Paper: Regular
Id Paper: 469
Topic: 7
Abstract:
The leather industry produces footwear, leather textiles, technical leather, and leather for haberdashery. The main auxiliary chemicals are compounds of trivalent and hexavalent chromium. Stabilization of appropriately treated natural hide, as a by-product of slaughterhouses, is carried out with 80% complex compounds of trivalent chromium, which creates strong coordination bonds with peptide groups of the skin protein - collagen, and thus achieves the desired useful properties of stabilized raw hide - leather. However, the use of chromium also carries risks. In relation to the shoes that we wear, it is important that the shoe material contains only trivalent chromium. According to standards, the maximum content of Cr VI in footwear is 3 ppm and 50 ppm Cr III of leachable chromium. Our contribution looks at both valences of chromium, the conditions under which trivalent chromium is oxidized to its toxic hexavalent form, and its relationship to the footwear and to our health.