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Environmental fate & pathways

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Three studies are available investigating the biodegradability of DMBPC in aquatic environments, all of which demonstrate that DMBPC is not readily biodegradable; however, all of these studies possess deficiencies preventing their selection as a key study. For this reason, the conclusion that DMBPC is not readily biodegradable is supported by the weight-of-evidence.

In a study performed according to OECD Test Guideline 301 F, the aerobic biodegradability of DMBPC was examined, testing two types of domestic activated sludge for a contact period of 800 h (approximately 33.3 d) (Lockwood SH, 2001b). In these tests, a maximum of 38 % degradation (measured by O₂ consumption) was observed after 800 h.

In a study performed according to OECD Test Guideline 301 C, the ready biodegradability of DMBPC was investigated (Institute of Ecotoxicology, Ltd., 2002). After a contact period of 28 d, 0 % degradation was observed (measured by O₂ consumption) in all three replicate samples.

In a third study, the biodegradability of DMBPC was investigated by High Performance Liquid Chromatography (HPLC) and Total Organic Carbon (TOC) analysis; no biodegradation was observed using either analytical method (Kurume Laboratory, 2001).

Based on this evidence, it is concluded that DMBPC is not readily biodegradable.