Registration Dossier
Registration Dossier
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EC number: 271-756-9 | CAS number: 68607-24-9
Water solubility
Administrative data
Link to relevant study record(s)
Description of key information
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.
Result:
The critical micelle concentration of C22-alkyltrimethylammonium chloride is 0.01 g/L at
25°C.
For ecotoxicological purposes, this value should be taken as the solubility.
Key value for chemical safety assessment
- Water solubility:
- 10 mg/L
- at the temperature of:
- 25 °C
Additional information
Summary
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.
Result:
The critical micelle concentration of C22-alkyltrimethylammonium chloride is 0.01 g/L at
25°C.
For ecotoxicological purposes, this value should be taken as the solubility.
Estimation of cmc from literature data
The following eqn. for the cmc of alkyl trimethyl ammonium chlorides is given in the literature [I.J.
Lin, Tenside Detergents 17, 119-123 (1980)]:
log(cmc) = 1.64 - 0.286n
where n is the length of the alkyl chain and cmc is in mol/L.
For n = 22 this gives a cmc of 2.2x10-5 M = 8.9 x 10-3 g/L. Within experimental error, this value
agrees with our surface tension experiments.
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