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Environmental fate & pathways

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Pthalic acid is considered to be stable towards hydrolysis.

An estimated half-life of 12.7 days in air was calculated with the AOP Program v1.91 of EPI-Suite. The experimentally determined half-life in sea water was 0.93 hours at 50°C.


Phthalic acid is readily biodegradable with 74 % within 30 days. Biodegradation was confimed in a read across approach of phthalic anhydride which hydrolysed within seconds to phthalic acid. For phthalic anhydride the biodegradation was 85 % whithin 14 days.


The estimated BCF of 3.16 indicates no affinity of phthalic acid for bioaccumulation.


The experimentally determined Koc was in a range of 2 -31, and hence no tendency for adsorption on soil is expected. Since the determination of the Koc was performed at different pH-values it is concluded that predication is valid even for the ionised substance.

Distribution The calculated Henry´s Law Constant was 2.21E-7 Pa m³/mole, therefore no potential to leave the aqueous phase is given. The distribution of phthalic 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 phthalic acid is water of 99.9 %.