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Henry's Law constant

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Description of key information

EU risk assessment report, p. 19, Volatilisation:
The Henry’s law constant calculated to be 0.216 Pa/(m3*mol) refers to the undissociated form of PTBBA. For pH 7, the constant can be normalised with the same equation as used for normalising the Koc (logKoc = 0.60 logKow + 0.32). For pH 7, a Henry’s law constant of 5 * 10-4 Pa m-3 mol-1 results indicating very low volatility. Consequently, the air-water partitioning coefficient Kair-water is 2.11 * 10-7 (equation 22 of the Technical Guidance Document). For pH 5, a Henry’s law constant of 0.011 Pa m-3 mol-1 and airwater partitioning coefficient Kair-water of 4.6 10-6 were calculated.

Key value for chemical safety assessment

Henry's law constant (H) (in Pa m³/mol):
at the temperature of:
20 °C

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