Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming 650093, China.
Environ Pollut. 2010 Sep;158(9):2826-32. doi: 10.1016/j.envpol.2010.06.023. Epub 2010 Jul 7.
The environmental behavior of antibiotics has attracted great research attention. However, their sorption mechanisms in soils/sediments are still unknown. Comparison of the sorption properties between the widely-studied hydrophobic organic contaminants (HOCs) and antibiotics may provide valuable insight to antibiotic sorption mechanisms. Thus, in this study batch experiments for pyrene (PYR), bisphenol A (BPA), and sulfamethoxazole (SMX) sorption were conducted on a sediment sample and its separated fractions. Our results showed the high sorption of PYR on black carbon and organic matter. Although high sorption of SMX was observed for both separated organic fractions (humic acids) and inorganic mineral particles, the original sediment particles showed relatively low sorption. Competitive sorption between SMX and dissolved humic acid on mineral particles was observed in this study. This competitive interaction is a unique process for antibiotic sorption in soils/sediments compared with apolar HOCs and may be one of the important factors controlling the antibiotic sorption.
抗生素的环境行为引起了广泛的研究关注。然而，它们在土壤/沉积物中的吸附机制仍不清楚。比较广泛研究的疏水性有机污染物（HOCs）和抗生素之间的吸附特性，可以为抗生素的吸附机制提供有价值的见解。因此，本研究通过批量实验，研究了芘（PYR）、双酚 A（BPA）和磺胺甲恶唑（SMX）在沉积物及其分离组分上的吸附行为。结果表明，PYR 高度吸附于黑碳和有机质。尽管 SMX 在两种分离的有机组分（腐殖酸）和无机矿物颗粒上都表现出高吸附性，但原始沉积物颗粒的吸附性相对较低。本研究中观察到 SMX 和溶解腐殖酸在矿物颗粒上的竞争吸附。与非极性 HOCs 相比，这种竞争相互作用是抗生素在土壤/沉积物中吸附的一个独特过程，可能是控制抗生素吸附的重要因素之一。
