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EC number: 273-489-3 | CAS number: 68987-29-1
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
In a study conducted according to OECD guideline 301F the test substance Silastol H 200 was proven to be not readily biodegradable; 0% degradation was observed, determined by oxygen consumption.
Key value for chemical safety assessment
- Biodegradation in water:
- under test conditions no biodegradation observed
Additional information
In a study conducted according to OECD guideline 301F the test substance Silastol H 200 was proven to be not readily biodegradable; 0% degradation was observed, determined by oxygen consumption.
However, there are reasonable doubts that the used method is not suitable to evaluate the biodegradation potential of 1-Octadecanol, phosphate, potassium salt.
In a FDA Decision for food contact notification a mixture containing potassium alkyl phosphate salts, was considered to be easily biodegraded by non-adapted bacteria. In a Zahn-Wellens test, the bioelemination was shown to be 96 % after 3 days and 97 % after 6 days. In conclusion 95 % biodegradability as a conservative estimate was used for assessment by FDA.
M.C.Biotec Inc. reported Potassium Cetyl Phosphate to be not readily biodegradable in a Manometric Respirometry Test according to OECD guideline 301 F and to be inherently biodegradable in a MITI Test II according to OECD guideline 302 C.
Furthermore the following information on readily biodegradability is published on the ECHA website. Phosphoric acid, mono-and di-C6 -10 alky esters were proven to be readily biodegradable in a screening test according to OECD guideline 301 B (Determination of the ready Biodegradability – Carbon Dioxide Evolution Test). As well the substance Phosphoric acid, 2-ethylhexyl ester is reported to be readily biodegradable, using the same test method.
Taken together, the method according to OECD guideline 301F seems to be not suitable to evaluate the biodegradation potential of 1-Octadecanol, phosphate, potassium salt.
Even though biodegradation of the substance under investigation could not be proven up to now, due to the structural similarity of the substances mentioned above biodegradation for 1-Octadecanol, phosphate, potassium salt is considered to be biodegradable under environmental condition.
As the evaluation of biodegradability is of crucial importance, it is deemed appropriate to postpone the evaluation until the hypothesis is proven by new study data, using a more appropriate test method.
Literature:
FDA, Environmental Decision Memo for Food Contact Notification No. 000388, April 2004, Environmental Toxicologist, Environmental Review Group (ERG)
MSDS, Potassium Cetyl Phosphate, M.C.Biotec Inc. No.40 Ma Jia Street, Nanjing 210009, China
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