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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

poorly biodegradable 

Key value for chemical safety assessment

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Due to the structure of the molecule and the extremely low water solubility of Phthalocyanines, biodegradation of the substance is not expected. However several tests on the biodegradability of single Phtalocyanines are available. All test results support the assumption that Phthalocyanines are only poorly biodegradable.

The biodegradability of CAS 147-14-8 was tested in a study following OECD guideline 301 F using domestic activated sludge as inoculum. After 28 days of inoculation a degradation rate of less than 1 % was determined. This result is supported by a second test accomplished according to OECD guideline 301 C. The study was performed with a mixture of sewage, soil and natural water as inoculum. The substance was degraded by 0 % after 14 days of incubation. Comparable results were obtained by a study determining the biodegradability of CAS 12239-87-1 in a test according to OECD guideline 301 C. No biodegradation of the test substance was observed after 28 days.