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The adsorption coefficient of hexyl acetate was determined in an OECD 121 HPLC screening test. Retention time in the column of a HPLC system was measured at 30oC. Dead time was determined by measuring the retention time of formamide. A calibration curve was created using retention time data from dead time and reference solutions. The adsorption coefficient (Koc) of the test substance was determined to be 293 (log Koc= 2.47).