Biodegradability of the antioxidant diaryl-p-phenylene diamine using a modified inherent biodegradation method at an environmentally relevant concentration

摘要: The chemical product diaryl-p-phenylene diamine (DAPD), produced by Goodyear Tire & Rubber Company as POLYSTAY 100 (CAS 68953-84-4), is employed an antidegradant in polymers used tires and industrial rubber products. Previous evaluations pertaining to the ecological fate of DAPD indicated a lack biodegradative activity aquatic media. In order further pursue biodegradation potential DAPD, it was deemed necessary enhance sensitivity assay through (a) employment radiotracer test substance, (b) optimisation conditions for achieving maximal solubilisation material media incubation vessels. Test vessels were prepared according OECD ready biodegradability guidelines, with added on silica gel at concentrations 10 or μg L(-1), together surfactant aid solubilisation. After 63 d up 37% mineralisation measured 29% applied radioactivity incorporated into cell biomass. Also, after 28 no could be solution radio-TLC HPLC-MS. These three results demonstrate that antioxidant undergoes microbiologically mediated highly unlikely persist environment.