Botero, Wander G.de Oliveira, Luciana C.Cunha, Bruno B. [UNESP]de Oliveira, Lilian K. [UNESP]Goveia, Danielle [UNESP]Rocha, Julio Cesar [UNESP]Fraceto, Leonardo F. [UNESP]Rosa, André Henrique [UNESP]2014-05-202014-05-202011-01-01Journal of The Brazilian Chemical Society. São Paulo: Soc Brasileira Quimica, v. 22, n. 6, p. 1103-1110, 2011.0103-5053http://hdl.handle.net/11449/193Interactions between two endocrine disruptors (ED) and aquatic humic substances (AHS) from tropical rivers were studied using an ultrafiltration system equipped with a 1 kDa cut-off cellulose membrane to separate free ED from the fraction bound in the AHS. Quantification of 17 alpha-ethynylestradiol and bisphenol A was performed using gas chromatography-mass spectrometry (GC-MS). The times required for establishment of equilibrium between the AHS and the ED were ca. 30 min, and complexation capacities for 17 alpha-ethynylestradiol and bisphenol A were 18.53 and 2.07 mg g(-1) TOC, respectively. The greater interaction of AHS with 17 alpha-ethynylestradiol, compared to bisphenol A, was due to the presence of hydrogen in the structure of 17 alpha-ethynylestradiol, which could interact with ionized oxygenated groups of the AHS. The results indicate that AHS can strongly influence the transport and reactivity of endocrine disruptors in aquatic systems.1103-1110engwaterpollutionendocrine disruptorsaquatic humic substancescomplexation capacityArtigo10.1590/S0103-50532011000600015S0103-50532011000600015WOS:000291823500015Acesso aberto41488374036182070000-0002-2042-018X