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EC number: 435-790-1 | CAS number: 297730-93-9
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No biodegradation of CAS# 297730-93-9 was observed under test conditions in an OECD TG301D assay. No further tests are scientifically justified. In view of its extreme volatility from aquatic systems, biodegradation is not an important fate for CAS# 297730-93-9. The products of abiotic degradation (see discussion of abiotic degradation / stability) are HF (CAS# 7764-39-3), TFA (CAS# 76-05-1), PFBA (CAS# 375-22-4), and CO2. HF is an inorganic, mineral acid and is not subject to biodegradation. A review of available published information indicates that TFA under aerobic conditions is not readily or inherently biodegradable. A review of available information indicates that perfluorocarboxylic acids under aerobic conditions are not readily or inherently biodegradable. In addition, it has been shown from studies with many other longer chain perfluorinated moieties that perfluorinated acids are oxidatively recalcitrant and resistant to most conventional waste treatment technologies (1). By a weight of evidence argument, PFBA is not expected to be biodegraded. Therefore, the degradation products of CAS# 297730-93-9 are expected to be very persistent in aquatic systems.
1) C. D. Vecitis, H. Park, J. Cheng, B. T. Mader, M. R. Hoffman. 2009. Treatment technologies for aqueous perfluorooctanesulfonate (PFOS) and perfluorooctanoate (PFOA). Front. Environ. Sci. Engin. China. Vol. 3, No. 2, pp. 129-151.
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