Centre of Applied Sciences and Technological Development, National Autonomous University of México, 3000 Avenida Universidad, Coyoacán, México City 04360, Mexico.
Geology Institute, National Autonomous University of México, 3000 Avenida Universidad, Coyoacán, México City 04360, Mexico.
Sci Total Environ. 2014 Mar 1;473-474:189-98. doi: 10.1016/j.scitotenv.2013.12.018. Epub 2013 Dec 23.
Sorption and leaching potential of ibuprofen, estrone and 17β estradiol were tested in two agricultural soils: one irrigated using municipal wastewater and the other used in rainfed agriculture. Batch sorption-desorption experiments and undisturbed soil column assays were carried out using both soils to which were added a mixture of the target compounds. The three compounds were sorbed to a different extent by both soils: estrone>17β estradiol>ibuprofen. Higher sorption was observed in the irrigated soil, which was attributed to the accumulation of organic matter caused by wastewater irrigation. Desorption of hormones was hysteretic in the irrigated soil, while ibuprofen showed low hysteresis in both soils. Retardation of the compounds' displacement was consistent with the sorption pattern observed in the batch tests. Retardation factor (RF) was similar for the three compounds in the two tested soils, indicating that the target compounds are much more mobile in the soil columns than would be predicted based on their equilibrium sorption parameters. The results obtained in the experiments clarify the role of wastewater irrigated soils as a filter and degradation media for the target micropollutants.
采用两种农业土壤（一种用城市污水灌溉，另一种用于雨养农业）进行了布洛芬、雌酮和 17β-雌二醇的吸附和解吸潜力测试。通过添加目标化合物的混合物，对这两种土壤进行了批吸附-解吸实验和原状土壤柱实验。三种化合物在两种土壤中的吸附程度不同：雌酮>17β-雌二醇>布洛芬。在灌溉土壤中观察到更高的吸附，这归因于废水灌溉引起的有机物积累。在灌溉土壤中，激素的解吸存在滞后现象，而布洛芬在两种土壤中均表现出较低的滞后性。化合物的迁移滞后与批量测试中观察到的吸附模式一致。在两种测试土壤中，三种化合物的迟滞因子（RF）相似，表明目标化合物在土壤柱中的迁移性比基于其平衡吸附参数预测的要高得多。实验结果阐明了污水灌溉土壤作为目标微量污染物的过滤和降解介质的作用。
