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Environmental fate & pathways

Bioaccumulation: aquatic / sediment

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Determining a single log Kow for a UVCB substance like reaction mass of 2,2'-oxybisbutane (DSBE), DIPE, SBA and 2-methylpropan-2-ol (TBA) was not possible. Based on an HPLC method, the log Kow was determined to be in the range 0.59 - 3.79. As an intermediate value, the log Kow measured for DIPE (2.37), which is one of the main constituents with ca. 30% of the substance is proposed.

Literature log Kow values of the main components of the reaction mass lie within the same range as the QSAR estimated or experimentally determined values discussed above: DSBE: 2.87 - 3.21 (1, 3); DIPE: 1.52 (2); SBA: 0.61 (3); TBA: 0.35 (3), thus confirming the validity of the measured data.

References:

(1) Estimation Program Interface (EPI) Suite, 2000-2009, U.S. Environmental Protection Agency (see HPV-report)

(2) Noriaki Funasaki, Sakae Hada, Saburo Neya, J. Phys. Chem., 1985, 89 (14), pp 3046–3049: Partition coefficients of aliphatic ethers - molecular surface area approach

(3) Hansch, C., and Leo, A. (1995).Exploring QSAR. Fundamentals and Applications in Chemistry and Biology.ACS Professional Reference Book, American Chemical Society, Washington, DC.

Furthermore, the substance is collected in chemical manufacturing plants as a distillation residue through closed piping into a central storage tank. From there, the substance is transported via railroad and/or truck tankers to refineries, producing gasoline fuels. Tankers are unloaded in refineries to storage tanks and from there, via closed piping, fed into distillation and blending facilities (oxygenated solvent streams such as "2-propanol and 2-butanol production, distn. residues" do improve motor fuel performance), to finally become part of engine fuels. During the whole production path from collecting the residues, via storage, transport, unloading and blending into fuel/gasoline, no exposure to the aquatic environment occurs and therefore a further investigation of bioaccumulation in aquatic / sediment environment is not required.

In conclusion, based on lack of exposure to the aquatic environment and supported by the low potential for bioaccumulation (log Pow values on average ~2.4), testing for bioaccumuation in the aquatic environment is not proposed.

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