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Description of key information

Tetrachlorophthalic anhydride hydrolysed rapidly in contact with water with a half-life of less than 5 minutes forming the hydrolysis product tetrachlorophthalic acid (CAS 632-58-6).

Key value for chemical safety assessment

Half-life for hydrolysis:
5 min
at the temperature of:
20 °C

Additional information

As the test substance tetrachlorophthalic anhydride was expected to undergo rapid hydrolysis to tetrachlorophthalic acid (CAS 632-58-6), the hydrolysis behaviour of the test susbtance in aqueous solutions was investigated with preliminary tests at room temperature at pH 4, pH 7 and pH 9, in deviation to the OECD TG 111. Degradation of tetrachlorophthalic anhydride and the formation of its hydrolysis product tetrachlorophthalic acid were monitored by HPLC analysis using UV-detection. The concentrations of formed tetrachlorophthalic acid in the hydrolysis test solutions were determined by external calibration method and correspond to the theoretical values assuming a complete degradation of the tetrachlorophthalic anhydride. An immediate degradation of the test substance was observed, and an exact determination of the half-life time or the hydrolysis rate was not possible. Therefore, the half-life time (t ½) is set to be lower than 5 minutes.