Registration Dossier
Registration Dossier
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EC number: 937-237-2 | CAS number: 1370006-50-0
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Partially unsaturated IQAC, DMS quaternised is not readily biodegradable, but inherently biodegradable.
Key value for chemical safety assessment
- Biodegradation in water:
- inherently biodegradable
Additional information
In a test according to the German Guideline DIN 38412, Part 25, which corresponds to the OECD 302 B test, partially unsaturated IQAC, DMS quaternised proved to be inherently biodegradable, > 90% COD elimination after 28 d. These findings are supported by further studies on ready biodegradability with ambiguous results.
A study according to OECD 301 E for partially unsaturated IQAC, DMS quaternised resulted in 63% Biodegradation after 28 days.
Similar results for the substance to register are reported in a study according to OECD Guideline 301 E (Ready biodegradability: Modified OECD Screening Test) which resulted in ready biodegradation based on DOC removal (75% degradation after 30 d), while based on TOC the read across substance was biodegraded by 59% after 30 days.
The ready biodegradation of the substance was investigated in a study conducted according to OECD Guideline 301F over a period of 28 days and using predominantly domestic activated sludge micro-organisms as inoculum. The test item was not readily biodegradable. The functional control reached the pass level >60% after 14 d. In the toxicity control containing both test and reference item >25% biodegradation ThCOD occurred within 14 d thus indicating that the test item was not inhibitory to the activated sludge organisms at the concentration tested. Biodegradation after 28 days was 0%.
In another study according to OECD Guideline 301 C (Ready Biodegradability: Modified MITI Test (I)) the test substance proved to be not readily biodegradable (4% after 36 d) under the test conditions employed. This study, however, is not used for the assessment, because the documentation is very scarce.
Based on these results, partially unsaturated IQAC, DMS quaternised, is regarded as inherently biodegradable.
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