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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

A reliable Klimisch 1 (OECD Guideline, to GLP standards) study assessed hydrolysis of the read across substance, Imidazolium compounds, 2-C17-unsatd.-alkyl-1-(2-C18-unsatd. amidoethyl)-4,5-dihydro-N-methyl, Me sulfates (CAS number 931 -745 -8), based on the C18:1/C18:1 imidazolinium quat constituent.

Hydrolysis of the test item at 1 mg a.i./L was studied in the dark at 20 ºC, 50 ºC and 60 ºC in sterile aqueous buffered solutions at pH 4 (acetate buffer), pH 7 (phosphate buffer) and pH 9 (borate buffer) for 5 days.  Samples were analysed by HPLC-Tandem Mass spectrometry, using a validated analytical method. For this constituent the study reported a solubility limit of 2.2 mg/L and therefore the test was run below the limit of solubility.


The half-life (lives)/DT50 (50% decline times) of the test item were:


at pH 4: > 1 year at 25°C


at pH 7: 2.9 days at 20°C, 2.5 days at 25°C, 27 hours at 50°C and 16 hours at 60°C

A supporting study is also presented for the read across substance, Fatty acids, C16-18 (even numbered) and C18 unsatd., reaction products with diethylene triamine, di-Me sulfate quaternized (CAS number 937 -237 -2). The hydrolysis of this substance was not able to be assessed due to the substance being insoluble.

Additional information