NACc was the best sorbent (additive amount was 0.2%) with the removal rates of 99.1, 78.9%, 99.1%, 98.5%, and 81.5 for BaP, LPAHs, HPAHs, [PAH.sub.4], and [PAH.sub.16], respectively.
The optimum conditions for elimination of BaP, HPAHs, LPAHs, and [PAH.sub.16] were achieved at WYACc amount of 1.0%, temperature of 100[degrees]C, and time of 35 min.
The residue amounts of BaP, LPAHs, HPAHs, [PAH.sub.4], and [PAH.sub.16] in the deodorized oil decrease with temperature and time increase.
Concentrations of individual PAHs as well as LPAHs, HPAHs, [PAH.sub.4], and [PAH.sub.16] in crude oil and each step of the oil refining process are presented in Table 4.
Meanwhile, LPAHs and HPAHs were 667.44 [+ or -] 15.96 and 96.50 [+ or -] 7.34 [micro]g/kg, respectively.
A decrease of PAHs amounts is clearly observed from both of the LPAHs and HPAHs, in higher or lower percentage, independent of the treatments adopted.