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Environmental fate & pathways

Bioaccumulation: aquatic / sediment

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Description of key information

Determined BCF values for bis(2-ethylhexyl) hydrogen phosphate were in the range between 1.1 and 6. Determinations were performed at concentrations of 0.1 and 1 mg/L. Bis(2-ethylhexyl) hydrogen phosphate is considered as not bioaccumulative.

Key value for chemical safety assessment

BCF (aquatic species):
6 dimensionless

Additional information

In a bioaccumulation study BCF values in the range between 1.1 and 6 for bis(2-ethylhexyl) hydrogen phosphate were determined with Cyprinus carpio as test organism within 6 weeks.

The study was carried out at the National Institute of Technology and Evaluation, Japan following the national standard procedure "Bioaccumulation test of chemical substance in fish and shellfish", order of the prime minister, the minister of health and welfare, the minister of international trade and industry No 1, Japan, 1974; which corresponds to the OECD Guideline 305 C.

Fish was exposed to bis(2-ethylhexyl) hydrogen phosphate at concentrations of 0.1 mg/l and 1 mg/l under flow-through conditions. The method of the analytical monitoring is not reported. After reaching a steady state of uptake and elimination, the remaining fish were transferred to a flow-through system containing clean water. At the concentration of 1 mg/l BCF values between 1.1 and 2.4 were determined. BCF values between 2.7 and 6 were determined at a concentration of 0.1 mg/l.

These results are in accordance with the calculated log Kow of 2.88 for the dissociated form of bis(2-ethylhexyl) hydrogen phosphate. The results show no indication of a bioaccumulation potential due to the exposure of the organisms via water.