|Title:||Partitioning of hydrochlorinated pesticides to chitin in seawater: Use of a radial-diffusion model to describe apparent desorption hysteresis||Authors:||González-Dávila, M.
Santana-Casiano, J. M.
|UNESCO Clasification:||251002 Oceanografía química||Keywords:||Adsorption
Desorption, et al
|Issue Date:||1995||Journal:||Chemosphere||Abstract:||Desorption hysteresis has been reported frequently in the literature, with several theories advanced to explain the cause of this phenomenon. Batch experiments were performed to observe sorption-desorption behaviour of endrin and heptachlor epoxide onto chitin in seawater as a function of chitin concentration, temperature and salinity. For full range of solids concentrations, sorption was described by a single linear partition coefficient. Desorption hysteresis was found at low chitin concentrations for endrin, increasing both at low temperatures and high salinity values. Results of these experiments were interpreted with a radial-diffusion sorption rate model. Model predictions of the desorption experiments showed that slow desorption rates explained most of the apparent hysteresis. The “salting effect” in marine systems makes partition coefficients ∼ 0.2 log unit higher than comparable partition coefficents measured in freshwater.||URI:||http://hdl.handle.net/10553/53495||ISSN:||0045-6535||DOI:||10.1016/0045-6535(95)00042-7||Source:||Chemosphere [ISSN 0045-6535], v. 30 (8), p. 1477-1487, (Abril 1995)|
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