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Environmental fate & pathways

Bioaccumulation: aquatic / sediment

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Description of key information

Bioaccumulation: BCF - 3-6.6 L/kg

Key value for chemical safety assessment

BCF (aquatic species):
6.6 L/kg ww

Additional information

The BCF of the substance, 3 -MTHPA D4, has been estimated using the software VegaNIC v0.16b - BCF model (CAESAR) v2.1.8 module, to give a value of 3 L/Kg whole body weight. Using another Q(S)AR software, BCFBAF v.3.01, to estimate BCF and BAF of the substance gave values of 6.63 L/kg ww and 6.56 L/kg ww, respectively.

 

As the substance is rapidly hydrolysed to the corresponding dicarboxylic acids, a Q(S)AR calculation of the BCF of the hydrolysis product of the different isomeric forms of MTHPA was conducted and gave a value of 3.162.

 

The BCF of 4-cyclohexene-1,2-dicarboxylic acid (CAS No. 88 -98 -2), the hydrolysis product of a similar substance within the cyclic anhydride category (category approach) was experimentally determined to be: <0.2 (conc. 2 mg/L) and <2 (0.2 mg/L). Similarly, the BCF of 4-methylcyclohexane-1,2-dicarboxylic acid. CAS No.57567-84-7, the hydrolysis product of a similar substance within the cyclic anhydrides category (category approach) was experimentally determined to be: <0.2 (conc 0.5 mg/L and <2.4 (conc 0.05 mg/L).

 

It is therefore concluded that the potential for bioaccumulation of 1,2,3,6-tetrahydro-3-methylphthalic anhydride (3-MTHPA D4) is low.