Characterization of the Interactions between Endocrine Disruptors and Aquatic Humic Substances from Tropical Rivers

• Autor(a) principal: Botero, Wander G.
• Data de Publicação: 2011
• Outros Autores: 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]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1590/S0103-50532011000600015; http://hdl.handle.net/11449/193
• topic: water; pollution; endocrine disruptors; aquatic humic substances; complexation capacity

Interactions 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.