Registration Dossier
Registration Dossier
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EC number: 201-607-5 | CAS number: 85-44-9
Endpoint summary
Administrative data
Description of key information
Additional information
The ready biodegradability of phthalic anhydride was determined in a modified MITI test comparable to OECD TG 301 C (Ready biodegradability: MITI (I) (Ministry of International Trade and Industry, Japan). 85 % degradation was observed after 14 days (MITI, 1992). Based on this result the substance is classified as readily biodegradable.
Inherent biodegradability of phthalic anhydride was assessed in a test, performed in a "fill-and-draw" type apparatus with aeration cylinders using activated sludge obtained from a waste water treatment plant. After 24 hours, 33 % degradation was measured with COD and 88 % with TOC (Matsui, 1975, 1988). Based on these results, the substance can be considered as inherently biodegradable under aerobic conditions.
The hydrolysis product phthalic acid shows 74% degradation after 30 days in a closed bottle test, which is comparable to the OECD TG 301 D (Bayer, 1973), indicating that the substance is readily biodegradable.
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