Publicación: Thermoluminescence and ATR-FTIR study of UVC-irradiated low-density polyethylene (LDPE) food packaging
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2024-12
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info:eu-repo/semantics/openAccess
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Elsevier
Resumen
This research aims to study the effects of ultraviolet C (UVC) radiation on low-density polyethylene (LDPE) food packaging. Main objectives include evaluating LDPE degradation and detecting UVC radiation using thermoluminescent dosimeters (TLDs) placed under LDPE samples. Results confirm accurate UVC detection after one hour of exposure, providing a useful tool for optimize food treatment procedures.
ATR-FTIR spectroscopy analysis revealed subtle alterations (<8 % transmittance relative) in UVC-irradiated LDPE samples, including possible Csingle bondH breakage (2910 and 2848 cm−1) and potential single bondCdouble bondCsingle bond bond vibrations (1470 cm−1), among others. However, observed variations may stem from LDPE properties rather than entirely from UVC radiation. A comparative study of UVC-induced thermoluminescence (TL) emissions provided insights into various TLDs materials. TL kinetic analysis, using computerised glow curve deconvolution (CGCD) method, unveiled trap charge activation due to UVC exposure, including partial ionization, bleaching effect and photo-transfer (PTTL) processes. LDPE samples amplified UVC-TL responses, revealing intensity differences between the TLDs attributed to the PTTL process, accentuated by the lack of an annealing treatment. Additionally, chemical composition of the TL detectors such as, type, concentration, number, oxidation states and ionic radii of their dopants may influence UVC-TL response. Consequently, TL intensity ratios follow as: GR-200 (LiF: Mg, Cu, P) > TLD-100 (LiF: Ti, Mg) > TLD-400 (CaF2: Mn) > TLD-200 (CaF2: Dy). Thus, GR-200 detects ionizing radiation but cannot distinguish between ionizing and non-ionizing UVC radiation, while TLD-100 has limited effectiveness as a UVC radiation detector. In contrast, TLD-400 is suitable for detecting UVC radiation and TLD-200 emerges as the most favorable UVC detector, showing consistent response levels and minimal PTTL effect placed under the LDPE samples without the need of a thermal annealing treatment that makes the TLD-200 to be reusable in a low-cost measurement protocol.
Descripción
The registered version of this article, first published in “Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy, Vol. 323, 124882", is available online at the publisher's website: Elsevier, https://doi.org/10.1016/j.saa.2024.124882
La versión registrada de este artículo, publicado por primera vez en “Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy, Vol. 323, 124882", disponible en línea en el sitio web del editor: Elsevier, https://doi.org/10.1016/j.saa.2024.124882
La versión registrada de este artículo, publicado por primera vez en “Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy, Vol. 323, 124882", disponible en línea en el sitio web del editor: Elsevier, https://doi.org/10.1016/j.saa.2024.124882
Categorías UNESCO
Palabras clave
Low-density polyethylene, Ultraviolet C radiation, ATR-FTIR, Thermoluminescence, Kinetics analysis, Food packaging
Citación
Boronat, Correcher, Benavente, & Bravo-Yagüe. (2024). Thermoluminescence and ATR-FTIR study of UVC-irradiated low-density polyethylene (LDPE) food packaging. Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy, 323. https://doi.org/10.1016/J.SAA.2024.124882
Centro
Facultades y escuelas::Facultad de Ciencias
Departamento
Química Inorgánica y Química Técnica