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Environmental fate & pathways

Henry's Law constant

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Description of key information

The QSAR determination of the Henry's Law Constant for the hydrolysis product tetrachlorophthalic acid using the model HENRYWIN included in the Estimation Program Interface (EPI) Suite v 4.1 revealed a value of 6.67E-08 Pa*m³/moL at 25°C.

Key value for chemical safety assessment

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

Additional information

As tetrachlorophthalic anhydride hydrolysed rapidly in water, the calculated value for the Henry's law constant of 0.194 Pa*m³/mole is only of theroretical interest. The Henry's law constant was therefore calculated for the hydrolysis product tetrachlorophthalic acid (CAS 632-58-6) to be 6.67E-08 Pa*m³/mole, indicating that tetrachlorophthalic acid is of very low volatility from water surfaces.