Determination of the distribution coefficient (kd) of benzo(a)pyrene in soil using sorption isotherms

Quimica nova

Flues, Marlene¹  D'Agostinho, Adriana¹ 

[1] Instituto de Pesquisas Energéticas e Nucleares, São Paulo, Brasil

关键词: benzo(a)pyrene;    sorption isotherm;    soil.;   

DOI  :  10.1590/S0100-40422006000400006

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

Leaking of dieseloil from gas stations is frequent in Brazil. The presence of polycyclic aromatichydrocarbons (PAHs), which are highly toxic is an indication of contaminationby heavy hydrocarbons from diesel oil. Here were present the determination ofthe distribution coefficient (Kd) of benzo(a)pyrene (the most carcinogenic ofthe PAHs) in tropical soils using the sorption isotherm model. The sorptioncurves acquired for benzo(a)pyrene were of the S-type, probably due to the water/methanolexperimental conditions. The sorption curves allowed calculation of the distributioncoefficient (Kd). The experimental Kd values were lower than those calculatedfrom literature Koc values (partition coefficient normalized by organic carbon),due mainly to the cosolvency effect and the percentage of organic matter andclay in soil.

【 授权许可】

CC BY