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Environmental fate and effects of dimethicone and cyclotetrasiloxane from personal care applications / C. Stevens in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 20, N° 5 (10/1998)
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Titre : Environmental fate and effects of dimethicone and cyclotetrasiloxane from personal care applications Type de document : texte imprimé Auteurs : C. Stevens, Auteur Année de publication : 1998 Article en page(s) : p. 297-305 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Dimethicone Cyclotetrasiloxane Environmental degradation effects Monitoring data Index. décimale : 668.5 Parfums et cosmétiques Résumé : This paper summarizes the environmental fate and effects of dimethicone and cyclotetrasiloxane, which are used extensively in personal care applications. Dimethicone and cyclotetrasiloxane differ fundamentally in their physicochemical properties, and as a consequence display different environmental fate paths. Cyclotetrasiloxane partitions into the atmosphere, whereas sediments and soils are the most important environmental compartments for dimethicone. Information is presented to show the environmental degradation of these two materials in their respective environmental compartments. In both cases, after a non-biological step to initiate the process, the degradation occurs biologically. Ultimately, both dimethicone and cyclotetrasiloxane are degraded to inorganic constituents, carbon dioxide, silicic acid and water. No adverse effects have been detected in experimental organisms representative of the environmental compartments in which dimethicone and cyclotetrasiloxane may be found. Monitoring of key environmental compartments, namely sediments and soil, reveals that average concentrations are well below the no-observed adverse effect level. This work therefore continues to support the environmental acceptability of dimethicone and cyclotetrasiloxane for personal care applications. DOI : 10.1046/j.1467-2494.1998.181595.x En ligne : https://onlinelibrary.wiley.com/doi/10.1046/j.1467-2494.1998.181595.x Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5008
in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 20, N° 5 (10/1998) . - p. 297-305[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 003975 - Périodique Bibliothèque principale Documentaires Disponible Anaerobic Biodegradation of Surfactants – Scientific Review / J. L. Berna in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 44, N° 6/2007 (12/2007)
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Titre : Anaerobic Biodegradation of Surfactants – Scientific Review Type de document : texte imprimé Auteurs : J. L. Berna, Auteur ; G. Cassani, Auteur ; C.-D. Hager, Auteur ; N. Rehman, Auteur ; I. Lopez, Auteur ; D. Schowanek, Auteur ; J. Steber, Auteur ; K. Taeger, Auteur ; T. Wind, Auteur Année de publication : 2008 Article en page(s) : p. 312-347 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Surfactants -- Biodégradation Tags : Anaerobic biodegradation biodegradability Wastewater treatment Screening tests Simulation sediment Monitoring data Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : The anaerobic biodegradation of surfactants is used as an acceptability criterion in some environmental pieces of legislation (eco-label, risk assessment, etc.), without a proper evaluation of the relevance of such a characteristic. Available screening test methods to assess the anaerobic biodegradation do not simulate the real conditions prevailing in these anaerobic compartments but rather reflect more stringent conditions, due to the high test substance/biomass ratio, possibility of inhibitory effects and limited possibility for adaptation. Therefore positive results are indicative of a similar behaviour under environmental conditions, while a negative result cannot be necessarily interpreted as inherent anaerobic recalcitrance. The majority of surfactants entering the environment will be exposed to and degraded under aerobic conditions, and only less than 20% will potentially reach temporarily anaerobic environmental compartments. In contrast to the well documented adverse effects observed in the absence of aerobic biodegradation, the lack of anaerobic biodegradation does not seem to be correlated with any apparent environmental problem for most compartments after more than 40 years of widely use of such products. The scientific review concluded that anaerobic biodegradability does not have the same environmental relevance as the aerobic one. Anaerobic biodegradability should not, therefore, be used as a pass/fail property for the environmental acceptability of surfactants which are readily biodegradable under aerobic conditions. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3195
in TENSIDE, SURFACTANTS, DETERGENTS > Vol. 44, N° 6/2007 (12/2007) . - p. 312-347[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 009017 - Périodique Bibliothèque principale Documentaires Disponible