Registration Dossier
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EC number: 203-916-0 | CAS number: 111-86-4
Water solubility
Administrative data
Link to relevant study record(s)
Description of key information
Water solubility (ISO 4311 - critical micelle concentration): 320 mg/L at 20°C
Key value for chemical safety assessment
- Water solubility:
- 320 mg/L
- at the temperature of:
- 20 °C
Additional information
In the key study, the surface tension of the test substance octylamin was determined according to ISO 4311 as a function of concentration. From the change in slope the solubility and apparent critical micelle concentration (cmc) were determined.
The critical micelle concentration of octylamine is 0.32 g/L at 20°C. For ecotoxicological purposes this value should be taken as the solubility in water. From the pKa of 10.6 and the concentration at the cmc in pure water (0.32 g/L), the approximation of pH by calculation yields pH of 10.9. This corrosponds with a protonated fraction of n-octylamine of 32.9% according to Henderson-Hasselbach equation.
There are several experimental data suggesting that the water solubility is in the range of 200-300 mg/L at 25°C (GUBDH 2009b; McBain 1946; Koelzer 1971). The calculated estimate of 2835 mg/L (GUBDH, 2009a) is therefore not regarded to be reliable.
In conclusion, the solubility in water using critical micelle concentration (0.32 g/L) is regarded as most reliable and used for environmental risk assessment.
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