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Environmental fate & pathways

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Transport and distribution tendency of NExBTL renewable diesel was studied in two different ways. Adsorption coefficient was determined according to the EU Method C.19 in a GLP compliant laboratory. Distribution modeling was performed with EQC Equilibrium Criterion Model 2.02 (Canadian Environmental Modelling Centre, 2003). Distribution modeling supported the test study, which indicated that NExBTL renewable diesel components have a tendency to sorb to sedimentary or soil organic carbon. The adsorption coefficient (Koc) was found to be 4.27x105 and logKoc was > 5.63. Over 99 % of NExBTL renewable diesel migrates to sediments when released in water whereas emissions to soil and air lead to its appearance in soil.

Although NExBTL renewable diesel is an UVCB compound, the range and type of alkanes present is relatively constant with C15-C18 isoalkanes tending to predominate. Regarding NExBTL renewable diesel as a single complex substance is justified based on the fact that the main components present are from a single chemical group (alkanes). It is well known that hydrocarbons of similar structure will have similar physicochemical properties and environmental-degradation potentials, and they will also have similar distributions and fates within a given environment.