Identificador persistente para citar o vincular este elemento: http://hdl.handle.net/10553/969
Título: Lindane adsorption-desorption on chitin in seawater
Autores/as: González-Dávila, Melchor 
Pérez Peña, Jesús 
Santana-Casiano, J. Magdalena 
Clasificación UNESCO: 251002 Oceanografía química
Palabras clave: Agua de mar
Lindano
Adsorción
Quitina
Adsorption, et al.
Fecha de publicación: 1992
Publicación seriada: International Journal of Environmental Analytical Chemistry 
Resumen: The adsorption and desorption processes by solid materials are important in determining the movement and fate of pesticide compounds in aquatic systems. Chitin is one of the constituents of natural organic matter and may serve as a model organic phase for studying the pesticide adsorption-desorption in marine systems. The lindane adsorption-desorption to chitin has been studied as a function of chitin concentration (2.5 gl−1 to 12.5 gl−1), temperature (5 to 45°C), pH (1.5 to 8) and salinity (15‰ to 36‰). Both, Freundlich and linear isotherms for the adsorption and desorption processes were used to represent the experimental data. Two-site Langmuir isotherm can describe well the measured sorption isotherm. The adsorbent-concentration effect and the adsorption-desorption hysteresis show the existence of different classes of site with different accessibility. Thus, the adsorption-desorption reaction of lindane is the result of more than a single mechanism. An increase in temperature (ΔH = −4.0 ± 0.7 Kcal mol−1) and a decrease in salinity resulted in both lower lindane adsorption and in a more reversible process. An increase of pH resulted in lower adsorption partition coefficients.
URI: http://hdl.handle.net/10553/969
ISSN: 0306-7319
DOI: 10.1080/03067319208027008
Fuente: International Journal of Environmental Analytical Chemistry [ISSN 0306-7319], v. 46 (1-3), p. 175-186
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