| Using peanut oil as raw material, the impacts of adsorbent type, adsorbent dosage, adsorption temperature and adsorption time on the removal effect of PAHs in oils and fats were investigated by single factor experiment, and the optimal removal conditions were optimized by orthogonal experiment. The results showed that the order of removal effect of different types of adsorbent on PAHs was from high to low: Norit-8015 activated carbon, WY2 activated carbon, WY1 activated carbon, Kermel activated carbon, activated clay, attapulgite. Considering the removal rate of B(a)P, HPAHs, PAH4, LPAHs and PAH16, the retention of peanut oil flavor and production cost overally, the optimal removal conditions were obtained as follows: dosage of WY2 activated carbon 1.0%, adsorption time 35 min and adsorption temperature 110 ℃. Under the optimal conditions, the residues of B(a)P, HPAHs, PAH4, LPAHs and PAH16 in peanut oil were 0.06, 0.69, 1.74, 95.11 μg/kg and 80.90 μg/kg respectively, and the removal rates were 99.74%, 99.28%, 98.65%,85.75% and 89.41%, respectively. In the case of only considering the residues of B(a)P and PAH4 to meet the EU standard(below 2 μg/kg and 10 μg/kg respectively), 0.5% of WY2 activated carbon was enough. Under this condition, the residues of B(a)P and PAH4 were 0.53 μg/kg and 6.64 μg/kg respectively, and the removal rates of B(a)P and PAH4 were 97.79% and 94.86%, respectively. |
