Registration Dossier
Registration Dossier
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EC number: 940-123-5 | CAS number: 866889-74-9
Water solubility
Administrative data
Link to relevant study record(s)
Description of key information
The water solubility of C16-18 DMAPA amido amine was determined to be 3.65 mg/L ± 0.8 mg/L at 23°C (pH 4-6) (OECD guideline 105/EU method A.6, slow stirring method/HPLC).
Key value for chemical safety assessment
- Water solubility:
- 3.65 mg/L
- at the temperature of:
- 23 °C
Additional information
The water solubility of C16-18 DMAPA amidoamine was analysed by slow stirring method and subsequent analysis with HPLC/CAD in accordance with OECD guideline 105 (27 July 1995) and EU method A.6 (30 May 2008). The analysis was focused on the two main alkyl constituents representing ≥85 % of C16-18 DMAPA amidoamine. The water solubility of the test item at 23°C (pH 4 -6) was determined to 3.65 mg/L ± 0.8 mg/L.
The following results from supporting substances are used for justification of read-across:
The water solubility of Stearic acid 3-(dimethylaminopropyl)amide was determined according to OECD guideline 105, 27 July 1995, using the flask method. The water solubility of Stearic acid 3-(dimethylaminopropyl)amide is 10 mg/L at 20°C (pH 6.8).
The critical micelle concentration (CMC) of Stearic acid 3-(dimethylaminopropyl)amide was determined according to ISO 4311, using the plate method.The CMC of Stearic acid 3-(dimethylaminopropyl)amide hydrochloride is 220 mg/L at 25°C.
The surface tension of the test substance C22-trimethylammonium chloride (Oh 05/233) was determined as a function of concentration. From the change in slope the critical micelle concentration (cmc) was determined. The critical micelle concentration of C22-alkyltrimethylammonium chloride is 0.01 g/L at 25°C.
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