摘要
研究了土壤和沉积物原始样品bulk及其有机质组分(非水解性有机质NHC、碳黑BC和腐殖酸HA)对17α-乙炔基雌二醇(EE2)和双酚A(BPA)的吸附行为.所有的吸附等温线都很好地拟合了Freundlich模型,除HA和bulk外,所有的吸附等温线都为显著的非线性(n值为0.46—0.76).对于EE2和BPA的吸附非线性因子n值都存在这样的关系:HA>NHC>BC.EE2以有机碳归一化的Freundlich吸附能力(lgKOC)有BC>NHC>bulk>HA的关系,说明有机质成熟度越高,对EE2或者BPA的吸附能力越高.在土壤和沉积物有机质SOM(NHC、BC和HA)对吸附BPA和EE2的贡献上,NHC、BC和HA对沉积物和土壤对BPA总吸附贡献上要明显弱于它们对EE2的贡献.除了内分泌干扰物(EDCs)的疏水性影响EE2和BPA的吸附能力的差异外,分子大小和带电子苯环数也影响它们的吸附能力差异.
The sorption of 17α-ethinyl estradiol（EE2） and bisphenol A（BPA） by nonhydrolyzable carbon（NHC）,black carbon（BC）,humic acid（HA） and whole sediment and soil samples（bulk） was examined.All the sorption isotherms fitted Freundlich models,and except for HA and EE2 on bulk,other sorption isotherms were nonlinear.For both EE2 and BPA,n values decreased in the order of HANHCBC,suggesting that sorption isotherm of BC exhibited the highest nonlinearity.The OC-normalized Freundlich sorption distribution coefficient（lgKOC） of EE2 decreased in the order of BCNHCbulkHA,demonstrating that the more condensed soil/sediment organic matter（SOM） had the higher capacity for EE2.As for the contribution to the overall sorption of EE2 and BPA by soil and sediment,the NHC,BC and HA isolates obviously played more important roles in EE2 sorption than BPA,suggesting that SOM in soil and sediment dominated the overall sorption of EE2.However SOM had less contribution to the overall sorption of BPA.Besides hydrophobicity,molecule size and number of benzene-ring with donor charge had influence on sorption capacity（lgKOC） of EE2 and BPA.
出处
《环境化学》
CAS
CSCD
北大核心
2012年第5期625-630,共6页
Environmental Chemistry
基金
中国水利水电科学研究院开放研究基金资助(IWHRKF201007)
国家自然科学青年基金(NNSFC)(40803029)资助
