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Environmental fate & pathways

Bioaccumulation: aquatic / sediment

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Description of key information

op-TSA does not have a potential to bioaccumulate.

Key value for chemical safety assessment

BCF (aquatic species):
2.6 dimensionless

Additional information

One study, valid without restrictions, is available with o-TSA. The study was performed according to OECD guideline 305C with Cyprinus carpio at 0.3 and 3 mg/L. After 42 days the BCF vaues were 0.4 to 0.9 at 3 mg/L and < 2.6 at 0.3 mg/L. This shows that o-TSA does not have a potential to bioaccumulate.

One study, valid with restrictions, is available with Oncorhynchus mykiss. The study was performed with Chloramine-T (CAS 127 -65 -1), but as p-TSA was detected and actually BCF values were calculated for p-TSA, this study can be used here as well.

The kinetic whole body BCF as calculated from the accumulation and depuration from fingerling half-lives using the p-TSA equivalent concentration (worst-case). The k1/k2 ratio as calculated according to OECD guideline 305 is 2.2 based on LSC. It should be noted that this ratio must be considered as a worst-case value because it is calculated using the p-TSA equivalent concentration for fingerlings, using the average depuration rate during the whole curve expressed in relation to the whole body. Lower ratios would be obtained if the data for juvenile rainbow trout would have been used.

As op-TSA is a mixture of o-TSA and p-TSA it can be concluded that op-TSA does not have a potential to bioaccumulate either.