where XO (g) is the total mass of wet sorbent after oil adsorption
and XS (g) is the mass of the sorbent before adsorption. All
experiments were conducted at room temperature (25 C 2 C)
and were performed in triplicate with the average value and
standard deviation (SD) calculated. Sample data with SD greater
than 10% were rejected with a re-run of the test carried out. A
dosage of 4 g was used for all subsequent experiments.