Research Group of Analytical Chemistry and Life Sciences, Department of Analytical Chemistry, University of Granada, Granada, Spain.
Environ Toxicol Chem. 2014 Mar;33(3):508-15. doi: 10.1002/etc.2476. Epub 2014 Jan 29.
Alcohol sulfates are one of the most important types of commercial anionic surfactants and may pose serious environmental problems. The present study examines the sorption behavior of alcohol sulfates in an agricultural soil using a batch reactor and column experiments. Kinetics and equilibrium isotherms of the sorption and desorption processes of the following alcohol sulfate homologues have been determined: AS-C12, AS-C14, AS-C16 , and AS-C18. Sorption and desorption occurred rapidly, and equilibrium was achieved in approximately 1 h. The sorbed mass percentages were 35.1% AS-C12 , 67.2% AS-C14 , and 100% for both AS-C16 and AS-C18. A pseudo-first-order kinetic model provided an adequate fit of data. Sorption and desorption equilibrium data were fitted into 1) a linear model, with r(2) values in the ranges 0.712 to 0.988 and 0.736 to 0.983, respectively, and 2) a Freundlich model, with r(2) values in the ranges 0.956 to 0.991 and 0.891 to 0.981, respectively. Continuous-flow experiments in soil columns were carried out to obtain the breakthrough curves for each compound. The present study provides basic theoretical concepts and key parameters for developing mathematical models that simulate the migration of alcohol sulfate into agricultural soils.
醇硫酸盐是最重要的商用阴离子表面活性剂之一，可能会对环境造成严重问题。本研究使用批量反应器和柱实验考察了醇硫酸盐在农业土壤中的吸附行为。确定了以下醇硫酸盐同系物的吸附和解吸过程的动力学和平衡等温线：AS-C12、AS-C14、AS-C16 和 AS-C18。吸附和解吸过程迅速，约 1 小时即可达到平衡。吸附的质量百分比分别为 35.1% AS-C12、67.2% AS-C14 和 100% AS-C16 和 AS-C18。拟一级动力学模型提供了对数据的良好拟合。吸附和解吸平衡数据分别拟合到 1) 线性模型，r(2)值范围分别为 0.712 到 0.988 和 0.736 到 0.983，以及 2) 弗伦德利希模型，r(2)值范围分别为 0.956 到 0.991 和 0.891 到 0.981。在土壤柱中进行连续流动实验，以获得每种化合物的穿透曲线。本研究为开发模拟醇硫酸盐向农业土壤迁移的数学模型提供了基本理论概念和关键参数。
