National Institute of Environmental Research, Incheon, Korea.
Arch Environ Contam Toxicol. 2010 Jul;59(1):147-56. doi: 10.1007/s00244-009-9429-1. Epub 2009 Dec 5.
This study investigated the sorption capacity of estrogenic compounds-such as estrone (E1), 17beta-estradiol (E2), and 17alpha-ethynylestradiol (EE2)-of different sediment particle fractions. Two-sized fractions of sediment were used in the experiments, with a particle size <1 microm (mostly from 450 to 800 nm) and >1 microm up to 50 microm. Sorption kinetics were followed using a two-step reaction in which the major amount of chemicals was sorbed rapidly within minutes and then gradually increased until equilibrium was reached after 48 h. The sorption capacity of the fine particle fraction (particle size <1 microm) was shown to be significantly higher than that of the large fraction (1 microm < particle size < 50 microm). The sorption kinetics and isotherm were adequately predicted by using a pseudo second-order model and the Freundlich equation, respectively. Total organic carbon (TOC) content and surface area of particle fractions were also measured. Although the effects of TOC on the sorption of estrogens could not be verified, a higher surface area of fine particle fractions may significantly increase sorption capacity to target compounds. Sorption of estrogens onto sediment particles could be used to explain the differences of estrogenic activity of E2 spiked into different size fractions of particle suspensions.
本研究考察了不同沉积物颗粒组分对雌激素类化合物（如雌酮（E1）、17β-雌二醇（E2）和 17α-乙炔基雌二醇（EE2））的吸附能力。实验中使用了两种粒径的沉积物，粒径<1 微米（主要为 450 至 800nm）和>1 微米至 50 微米。采用两步反应法跟踪吸附动力学，其中大部分化学物质在几分钟内迅速吸附，然后逐渐增加，48 小时后达到平衡。细颗粒组分（粒径<1 微米）的吸附能力明显高于大颗粒组分（1 微米<粒径<50 微米）。吸附动力学和等温线分别通过准二级模型和 Freundlich 方程得到了较好的预测。还测量了颗粒组分的总有机碳（TOC）含量和表面积。尽管 TOC 对雌激素吸附的影响无法得到验证，但细颗粒组分的较高表面积可能会显著增加对目标化合物的吸附能力。雌激素在沉积物颗粒上的吸附可以用来解释 E2 被加入到不同粒径颗粒悬浮液中后雌激素活性的差异。
