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Environmental fate & pathways

Adsorption / desorption

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Description of key information

The adsorption coefficient (Koc) of BPA-TA is < 33.1, log Koc <1.52 at 25 °C.

Key value for chemical safety assessment

Additional information

Due to BPA-DA being hydrolytically unstable, the adsorption coefficient of the hydrolysis product BPA-TA (4,4-Bisphenol A Tetra-Acid, CAS # 38103-05-8) was determined in accordance with OECD 121 under GLP conditions (Springborn Smithers Laboratories, 2009).The study was awarded a reliability score of 1 in accordance with the criteria set forth by Klimisch et al. (1997).

The mathematical extrapolation of the Koc given the retention time of BPA-TA compared to the standards employed in the study was estimated to be < 0.000000740 (mean log Koc = -6.13). Since the retention time of BPA-TA was lower than the retention time for acetanilide (the earliest eluting calibration standard identified in the OECD 121 guideline), the Koc for 4BPA-TA was reported as less than 33.1, the Koc of acetanilide (log Koc <1.52).

The adsorption coefficient (Koc) of BPA-TA is < 33.1, log Koc <1.52 at 25 °C.

In accordance with section 9.3.3 of Column 2 of REACH Annex IX, the study does not need to be performed if based on the physicochemical properties the substance can be expected to have a low potential for adsorption. The result obtained for the adsorption screening study conducted to fulfil the Annex VIII data requirements indicates that the substance has a low adsorption potential. It is therefore considered justified to omit this study.