Year: 2025
Type: article
Abstract: The scientific understanding and demonstration of the immobilization of heavy metals (notably lead and chromium) in food contact materials is crucial for the safety of environment and humans. To tackle this issue lead crystal glasses doped between 50 and 2000 ppm of chromium oxide were carried out under severe aqueous alteration conditions (acetic acid 4% (v/v), pH 2.4, 70°C, 330 days). The increase in Cr leads to a decrease in the Pb release into the solution. The leached Cr content was lower than Pb, itself much lower than alkali ones. Structural characterization before and after alteration points out the presence of Cr(III) exclusively, with no redox changes in the course of alteration. Cr and Pb are partially retained during alteration near cationic domains, less accessible to protonated species. Cr favors the Si recondensation in the rich non-bridging oxygen (NBO) mixing sites, leading in an increase of glass polymerization within the altered layer.
Source: npj Materials Degradation
Institutions: Université de Montpellier, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, CEA Marcoule, Institut des Sciences et technologies pour une Economie Circulaire des énergies bas carbone, Centre National de la Recherche Scientifique, Université Paris-Saclay, CEA Paris-Saclay - Etablissement de Saclay, CEA Paris-Saclay, Sorbonne Université, Institut de minéralogie, de physique des matériaux et de cosmochimie, Institut de Recherche pour le Développement, Institut de physique du globe de Paris, Université Paris Cité, European Synchrotron Radiation Facility, Laboratoire d’Archéologie Moléculaire et Structurale
Language: English
Subfield: Ceramics and Composites
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,590
OpenAlex ID: W4410030449