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In the defined HPLC assay of OECD Guideline 121, no chromatographic peak for the test material was observed under the specified elution conditions. Additional analyses were performed using an eluent containing a higher organic solvent (methanol) concentration and showed that ACCUTRACE™ S10 Fuel Marker has a log Koc value of >5.63 (i.e., the highest log Koc value from among the reference materials). The ACCUTRACE™ S10 Fuel Marker is therefore concluded to have very high affinity for organic matter associated with soil, sediment, and activated sludge biosolids.