为阐明底泥表面附着生物膜在内分泌干扰物迁移转化中的作用,对生物膜在底泥吸附乙炔雌二醇(EE2)、双酚 A(BPA)和壬基酚(4-NP)过程中的作用机制进行研究。结果表明,BPA、EE2和4-NP 的有机物标准分配系数(koc )为101.78~103.02 L/ kg,经 H2 O2处理所得底泥中 EE2的有机物标准分配系数(102.32 L/ kg)大于未经处理的底泥(102.19 L/ kg)。建立了两阶段吸附(快速吸附和慢速吸附)动力学模型(r2>0.95),模型拟合结果显示,在吸附过程中,快速吸附发挥了主要作用,而慢速吸附则决定了反应程度。底泥表面附着生物膜会阻碍污染物向底泥的传质行为,并且对底泥的吸附能力没有促进作用。
The role of biofilm covering on sediments in the adsorption of three endocrine-disrupting chemicals (EDCs), 17α-ethinyl estradiol (EE2), bisphenol A (BPA), and 4-nonylphenols (4-NP), was investigated. The results indicated that the organic carbon (OC)-normalized distribution coefficients (koc ) of BPA, EE2, and 4-NP ranged from 101. 78 to 103. 02 L/ kg. After the oxidation of sediments by H2 O2 , the koc of EE2 was higher (102. 32 L/ kg) than before the oxidation ( 102. 19 L/ kg ). A two-stage adsorption ( fast adsorption and slow adsorption) kinetic model was established (r2>0. 95). The simulation results showed that the fast adsorption section played the main role in the adsorption process, while the slow adsorption section determined the extent of the reaction. The biofilm on the surface of sediments may act as a barrier in mass transfer from water to sediment and seldom improve the adsorption capacity of sediments.