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Environmental fate & pathways

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The test item is a UVCB that contains reaction products of 1-octanol and phosphorus pentoxide. The reaction products are mono‐, di‐ and trioctanyl phosphate esters and a mixture thereof. As a consequence, this mixture contains already compounds that can be obtained also during the hydrolysis study. Some of the esters produced during the hydrolysis study will be the same as the initially present esters. Since, it is not possible to differentiate the hydrolysis products from the initially present reaction products, the hydrolysis study cannot be performed.

 

The adsorption/desorption properties of the UVCB test item were assessed following the OECD 117 HPLC method. The log Koc was determined to be 1.15 (di ester) and 1.19 (mono ester). The biodegradation of the UVCB test item was assessed following the OECD 301 B (CO2 Evolution Test). The relative biodegrading values calculated from the measurements performed during the test period revealed 51% and 45% biodegradation of test Item (based on ThCO2), for the duplicate vessels tested. These results indicate that the test item is not readily biodegradable. However, since the results of the present test indicate that the pass level criterion was almost fulfilled the results can be used to indicate inherent biodegradability.

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