2004
DOI: 10.1021/jf030833j
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Use of Activated Bentonites in Controlled-Release Formulations of Atrazine

Abstract: The herbicide atrazine (6-chloro-N2-ethyl-N4-isopropyl-1,3,5-triazine-2,4-diamine) was incorporated in alginate-based granules to obtain controlled-release (CR) properties. The basic formulation [sodium alginate (1.40%)-atrazine (0.60%)-water] was modified by the addition of sorbents. The effect on atrazine release rate caused by the incorporation of acid-treated bentonite (0.5 and 2.5 M H2SO4) in alginate formulation was studied by immersion of the granules in water under static conditions. The water uptake, … Show more

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Cited by 60 publications
(45 citation statements)
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“…The adsorption isotherms of the fungicide thiram on the two soil were classified as L-type as the sorption kinetics corresponded to that of the L-type in the classification by Giles et al (1960). The L-types isotherms represent a system where the solid surface has average affinity for the pesticide and the solvent is relatively inert, i.e., there is no strong competition from the solvent for adsorption sites (Fernandez-Perez et al, 2004;Sharma et al, 2011). This isotherm shape was also reported by ValverdeGarcia et al (1988) to fit the adsorption of thiram onto eight Mediterranean soil types typical of Almería (Spain).…”
Section: Adsorption Kinetics Studymentioning
confidence: 99%
“…The adsorption isotherms of the fungicide thiram on the two soil were classified as L-type as the sorption kinetics corresponded to that of the L-type in the classification by Giles et al (1960). The L-types isotherms represent a system where the solid surface has average affinity for the pesticide and the solvent is relatively inert, i.e., there is no strong competition from the solvent for adsorption sites (Fernandez-Perez et al, 2004;Sharma et al, 2011). This isotherm shape was also reported by ValverdeGarcia et al (1988) to fit the adsorption of thiram onto eight Mediterranean soil types typical of Almería (Spain).…”
Section: Adsorption Kinetics Studymentioning
confidence: 99%
“…These include materials composed of silica [12], clays such as bentonites [13] and sepiolite [14], polymers such as alginate [15] and 0304-3894/$ -see front matter © 2010 Elsevier B.V. All rights reserved. doi:10.1016/j.jhazmat.2010.12.044 lignin [16], and synthetic polymers such as polyhydroxyalkanoates (PHAs) [17], including polyhydroxybutyrate (PHB) and its copolymer hydroxyvalerate (PHBV), which are the most widely used PHA polymers [18].…”
Section: Introductionmentioning
confidence: 99%
“…These adsorption isotherms have been classified as L type of Gile's classification (Somasundaran and Wang 2006;Calvet 1989) which represents a system where the solid surface has average affinity for the pesticide and the solvent is relatively inert. In other words, there is no strong competition from solvent for adsorption sites (Fernandez-Perez et al 2004). The Freundlich's adsorption coefficients K f and n f were calculated from the plot of log C s vs log C e (Figure 3), and results are summarized in Table 3.…”
Section: Resultsmentioning
confidence: 99%