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

Química Nova

Flues, Marlene¹  Instituto de Pesquisas Energéticas e Nucleares, São Paulo, Brasil¹  D'Agostinho, Adriana¹ 

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

【 授权许可】

Unknown