Rico-Rico Angeles, Temara Ali, Behrends Thilo, Hermens Joop L M
Institute for Risk Assessment Sciences, Utrecht University, Yalelaan 2, 3508 TD Utrecht, The Netherlands.
Environ Pollut. 2009 Feb;157(2):377-83. doi: 10.1016/j.envpol.2008.10.008. Epub 2008 Nov 20.
Linear alkylbenzene sulfonates (LAS) are anionic high production volume surfactants used in the manufacture of cleaning products. Here, we have studied the effect of the characteristics of marine and estuarine sediments on the sorption of LAS. Sorption experiments were performed with single sediment materials (pure clays and sea sand), with sediments treated to reduce their organic carbon content, and with field marine and estuarine sediments. C12-2-LAS was used as a model compound. Sorption to the clays montmorillonite and kaolinite resulted in non-linear isotherms very similar for both clays. When reducing the organic content, sorption coefficients decreased proportionally to the fraction removed in fine grain sediments but this was not the case for the sandy sediment. The correlation of the sediment characteristics with the sorption coefficients at different surfactant concentrations showed that at concentrations below 10 microg C12-2-LAS/L, the clay content correlated better with sorption, while the organic fraction became more significant at higher concentrations.
直链烷基苯磺酸盐（LAS）是用于制造清洁产品的高产量阴离子表面活性剂。在此，我们研究了海洋和河口沉积物特性对LAS吸附的影响。使用单一沉积物材料（纯粘土和海砂）、经过处理以降低其有机碳含量的沉积物以及现场海洋和河口沉积物进行吸附实验。以C12 - 2 - LAS作为模型化合物。蒙脱石和高岭土对LAS的吸附产生了非常相似的非线性等温线。在降低有机含量时，吸附系数与细颗粒沉积物中去除的部分成比例下降，但砂质沉积物并非如此。不同表面活性剂浓度下沉积物特性与吸附系数的相关性表明，在浓度低于10μg C12 - 2 - LAS/L时，粘土含量与吸附的相关性更好，而在较高浓度下有机部分变得更显著。
