Investigating Factors Affecting the Efficacy of Polycyclic Aromatic Hydrocarbon Extraction by Tenax in Soil
With the increase in population and the continuous advancement of urban industrialization in China,the pollution of agricultural soil by polycyclic aromatic hydrocarbons(PAHs)is escalating.If not properly managed,the hazards caused by PAHs can accumulate over time,ultimately endangering human health.In order to optimize the extraction process of PAHs from polluted soil and enhance the accuracy of on-site risk assessment,this study conducted in vitro simulated experiments using poly(2,6-diphenyl-p-phenylene oxide)(Tenax)as an adsorbent to simulate intestinal absorption.The experimental results demonstrate that the in vitro digestion method with the addition of Tenax achieves an extraction rate of up to 80%for PAHs.Various influencing factors,including the solid-to-liquid ratio,Tenax dosage,and bile salt dosage,significantly affect the extraction results.Among them,the solid-to-liquid ratio has the greatest impact,followed by the Tenax dosage and then the bile salt dosage.Through orthogonal experiments,the optimal extraction conditions for four types of PAH pollutants are determined as follows:for fluorene(FLT):solid-to-liquid ratio of 250 mL,Tenax dosage of 0.75 g,and bile salt dosage of 6 g;for benzo(b)fluoranthene(BbF):solid-to-liquid ratio of 250 mL,Tenax dosage of 0.75 g,and bile salt dosage of 3.5 g;for benzo(k)fluoranthene(BkF):solid-to-liquid ratio of 250 mL,Tenax dosage of 0.75 g,and bile salt dosage of 1.75 g;for indeno(1,2,3-cd)pyrene(IPY):solid-to-liquid ratio of 250 mL,Tenax dosage of 0.75 g,and bile salt dosage of 3.5 g.
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