Adsorption and Desorption of Atrazine, Deethylatrazine, Deisopropylatrazine, Hydroxyatrazine, and Metolachlor in Two Soils from Virginia

Aspect of the degradation and adsorption kinetics of atrazine and metolachlor in andisol soil

“…8); for this andisol soil, the K oc varied between 59.7 and 64.0 L kg -1 for atrazine and between 43.1 and 45.7 L kg -1 for metolachlor, respectively. K oc was reported to be negatively correlated with the aqueous solubility of chemicals (Seybold and Mersie, 1996). This trend was confi rmed by this experiment as the solubility of atrazine is lower than that of metolachlor and the average K oc of atrazine was higher than that of metolachlor.…”

“…C-type (n=1) isotherms have been also described for the sorption of atra- zine on soils (Celis et al, 1997). The exponent 1/n of metolachlor was less than 1 for temperature of 5 and 35°C which indicating that metolachlor adsorbed to the andisol soil decreased slightly as the initial concentration increased (Flores et al, 2009;Seybold and Mersie, 1996). Adsorption of atrazine and metolachlor can be considered to be linear over the concentration range evaluated.…”

“…The K f values reported for atrazine include 0.2-4.2 L kg -1 (Brouwer et al, 1990), 3.8-6.5 L kg -1 (Sharon and Koskinen, 1990), 0.4-3.1 L kg -1 (Moreau and Mouvet, 1997), and 1.5-2.0 L kg -1 (Seybold and Mersie, 1996). For metolachlor, K f ranging from 3.72 to 6.61 and n ranging from 0.97 to 1.17 were reported by Krutz et al (2004).…”

Sorção e dessorção do imazaquin em solos com diferentes características granulométricas, químicas e mineralógicas

“…Esta não-singularidade ou histerese no processo de sorção-dessorção foi avaliada por meio do índice de histerese (N sor /N des ), que estabelece uma relação entre o grau de linearidade da sorção e o da dessorção. Quanto maior este índice, maior a histerese e maior será a irreversibilidade do processo de sorção (Seybold & Mersie, 1996). No quadro 3, constata-se que ocorreu histerese em todos os solos, com maior intensidade no RQ.…”

Predicting Freundlich adsorption isotherm of atrazine on Japanese soils

“…Many studies have been reported on the adsorption of s-triazine herbicides on soils and soil constituents (Seybold and Mersie 1996;Celis et al 1997Celis et al , 1998Sawhney and Singh 1997). These compounds, including atrazine (2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine) ( Fig.…”