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Environmental fate & pathways

Henry's Law constant

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Description of key information

Alkyl phosphate and stearyl amine salts (EC = 952-252-4) are mainly composed by primary alkylamines (CAS 90640-32-7, UVCB) and phosphoric acid, octadecyl ester (CAS 39471-52-8, Multi-Constituent). The registered substance has a low vapour pressure of << 10-6 Pa at 20°C (ASTM E 1782-03).

Moreover, Henry’s law constant calculated QSAR values based on the molecular structure of the alkylamines at pH 7 are available, considering the degree of protonation. For the model calculations, a mean value of 0.01 Pa.m3/mol is used. Considering the low values, volatilisation at environmental conditions is expected to be negligible.

Key value for chemical safety assessment

Henry's law constant (H) (in Pa m³/mol):
0.01
at the temperature of:
25 °C

Additional information

Alkyl phosphate and stearyl amine salts (EC = 952-252-4) are mainly composed by primary alkylamines (CAS 90640-32-7, UVCB) and phosphoric acid, octadecyl ester (CAS 39471-52-8, Multi-Constituent). The registered substance has a low vapour pressure of << 10-6 Pa at 20°C (ASTM E 1782-03).

Phosphoric acid, octadecyl ester are not expected to be volatile according their low vapour pressure value of 0.004 Pa at 25ºC according OECD Guideline 104 and GLP.

Then, calculated QSAR values based on the molecular structure of the amines at pH 7 are available, considering the degree of protonation. For the model calculations, a mean value of 0.01 Pa.m3/mol is used.

Within a weight of evidence approach, information regarding both elements is available showing that the registered substance is not expected to be volatised from water under environmental conditions.