Application of Compound-Specific Isotope Analysis (Csia) In Identifying Sources and Transformation Mechanisms of the Main Synthetic Musk Compound (Galaxolide) - Université de Pau et des Pays de l'Adour Accéder directement au contenu
Communication Dans Un Congrès Année : 2023

Application of Compound-Specific Isotope Analysis (Csia) In Identifying Sources and Transformation Mechanisms of the Main Synthetic Musk Compound (Galaxolide)

Résumé

The knowledge of isotopic fingerprints of the environmental organic compounds is of paramount importance in evaluating the fate of organic compounds allowing to trace the source and address transformation processes. Galaxolide (HHCB) is the most frequently used synthetic musk compound, which is attributed to the chemicals of the highest concern. However, despite being life-threatening, its environmental fate not yet fully known. In this study, we investigated the degradation potential of HHCB and its isotopic fractionation using compound-specific isotope analysis (CSIA) during photodegradation and biodegradation in the aquatic ecosystem. Photodegradation experiments were carried out to investigate direct and indirect photolysis under natural (solar irradiation) and treatment process (UVC irradiation) in synthetic and riverine water including nitrate (NO3 -), carbonate (CO3 2-), humic substances associated with different experimental conditions, and hydrogen peroxide (H2O2) in relation to the treatment process. Pure bacterial strain that has been previously isolated from marine canyon sediment was cultivated to test HHCB microbial degradation. Concentrations and carbon isotopic signatures were determined by GC-MS and GC-C-IRMS, respectively. The results have demonstrated that HHCB was quickly photodegraded by direct and indirect photolysis in a range from 40±4 to 202±29 minutes half-life time. Enhanced degradation was observed in the presence of H2O2 under UVC irradiation due to hydroxyl radicals. Up to 90% of the HHCB depletion driven by a bacterial strain which belongs to genus Bacillus sp. was recorded with 368±95 min half-life time. Although a high degradation of HHCB was obtained, no significant isotopic fractionation was determined neither due to photodegradation nor biodegradation. These results reveal that carbon isotopic composition in HHCB is stable against different degradation processes. Isotopic fingerprinting of HHCB can thus be used as novel approach to distinguish the source of HHCB directly from the commercial products and environmental samples.
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Dates et versions

hal-04238431 , version 1 (12-10-2023)

Identifiants

  • HAL Id : hal-04238431 , version 1

Citer

Hatice Turan, Mathieu Sebilo, Thierry Pigot, B.K. Hassani, Remy Guyoneaud, et al.. Application of Compound-Specific Isotope Analysis (Csia) In Identifying Sources and Transformation Mechanisms of the Main Synthetic Musk Compound (Galaxolide). SETAC Europe 33rd Annual Meeting, Apr 2023, Dublin, Ireland. ⟨hal-04238431⟩
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