Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Stability

In contact with water tetrachlorophthalic anhydride hydrolysed rapidly, the half-life was less than 5 minutes, and tetrachlorophthalic acid was identified as hydrolysis product..

An atmospheric half-life of 508 days was calculated for tetrachlorophthalic anhydride due to indirect phototransformation in air. The calculated half-life for the hydrolysis product tetrachlorophthalic acid was 15 days.

Biodegradation

Tetrachlorophthalic anhydride is not readily biodegradable and its hydrolysis product tetrachlorophthalic acid is considered to be not readily biodegradable.

Bioaccumulation

As tetrachlorophthalic ahydride decomposes rapidly in water, the hydrolysis product tetrachlorophthalic acid is taken into account for assessment on bioaccumulative properties. A BCF of 3.16 has been calculated with the EPI Suite Estimation Program (BCFWIN) taking the measured log Kow in account, indicating no significant potential for bioaccumulation.

Adsorption

The calculated Koc of 0.1243 for the hydrolysis product tetrachlorophthalic acid in its deprotonated form suggest that the substance has a negligible sorption potential to soil and sediment, and a rapid migration potential to groundwater.

Distribution

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 intrest. The Henry's law constant was therefore calculated for the hydrolysis product tetrachlorophthalic acid to be 6.67E-08 Pa*m³/mole, indicating that tetrachlorophthalic acid is of very low volatility from water surfaces.

The distribution of hydrolysis product tetrachlorophthalic acid in a "unit world" was calculated according to the Mackay fugacity model level I based on the physico-chemical properties. The main target compartment for tetrachlorophthalic acid is water with 79.81 %, followed by sediment with 10.11 %, soil with 10.0 %.