Comparison of adsorption behaviors of selected endocrine?disrupting compounds in soil

Bisphenol-A (BPA), 17?-ethinylestradiol (EE2), and 4-nonylphenol (4NP) are endocrine-disrupting chemicals (EDCs) that useful models for studying the potential fate transport of EDCs in soil water environments. Two alluvial soils with contrasting physicochemical properties were used as adsorbents this study. The Zook material had more organic matter clay than sandy loam Hanlon material. Batch equilibrium experiments performed to generate adsorption isotherms, determine parameters, assess desorption hysteresis. Adsorption BPA both followed an L-type isotherm, 4NP adsorbed exhibited S-shape isotherms. EE2 also S-shaped but showed H-type isotherm. Overall, Sips model fit data well, standard errors prediction generally ?6%. affinity (KLF) values highest 4NP, lowest hysteresis indices. suggest was most likely by via hydrogen bonding involving its two phenolic groups. In contrast, isotherm shape, indices, lack desorption, molecular-scale characteristics led us infer largely retention molecular clusters, perhaps nanopores. Finally, different shapes well intermediate suggesting molecules could be retained clay.