Chemical and Physical Processes that Affect Atrazine and Distribution in Soil Systems

Swanson, Roger A.; Dutt, Gordon R.

doi:10.2136/sssaj1973.03615995003700060024x

Cited by 84 publications

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“…Noncoincidence of ad sorp tion and desorption iso therms is called hys ter esis 21 and it in di cates that a dif fer ent range or spec trum of forces are in volved in ad sorp tion than in desorption. Hys ter esis has been ob served in other her bicide ad sorp tion stud ies [22][23][24] . The re vers ibil ity of ad sorp tion plays an im por tant role in her bi cide con trol in ag ri cul ture.…”

Section: Ad Sorp Tion Iso Thermsmentioning

confidence: 99%

HRGC study of sorption and desorption of atrazine, ametryn and metolachlor on Brazilian soils

Queiroz¹,

Lanças²

1997

J. Braz. Chem. Soc.

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Os processos de adsorção e dessorção dos herbicidas ametrina, atrazina e metolaclor foram estudados em cinco so los brasileiros com diferentes conteúdos de matéria orgânica, utilizando-se cromatografia gasosa de alta resolução (HRGC). As linhas de regressão geradas apresentaram coeficiente de determinação > 0,964, indicando um bom ajuste dos da dos à equação de Freundlich. O equilíbrio de adsorção foi atingido em aproximadamente 6 h. Histerese foi observada nas isotermas de adsorção e dessorção. Correlações significativas foram encontradas en tre o coeficiente de adsorção, matéria orgânica e capacidade de troca de cátions. Não foram observadas correlações en tre o coeficiente de adsorção dos herbicidas (ametrina, atrazina e metolaclor) e solubilidade em água, pKa e massa mo lec u lar destes compostos, pois estes herbicidas não pertencem à mesma família química. Por este fato, as correlações en tre adsorção e propriedades dos herbicidas citadas acima foram estabelecidas somente en tre as triazinas. O coeficiente de adsorção das triazinas mostrou-se diretamente correlacionado com a solubilidade em água, pKa e massa mo lec u lar destes compostos nos solos avaliados.The sorp tion and desorption of her bi cides ametryn, atrazine and metolachlor were stud ied in five Bra zil ian soils with var i ous or ganic mat ter con tents us ing high res o lu tion gas chro matog ra phy (HRGC). The re gres sion lines gen er ated pre sented a co ef fi cient of de ter mi nation > 0.964, which in di cates a good fit of the data by the Freundlich equa tion. Sorp tion reached an ap par ent equi lib rium in the soils within ap prox i mately 6 h. Hys ter esis was ob served in both sorp tion and desorption iso therms. Sig nif i cant cor re la tions were found among sorp tion of herbi cides, or ganic mat ter, and cat ion-exchange ca pac ity. No re la tion ship was found be tween adsorp tion of the her bi cides (ametryn, atrazine, and metolachlor) and their wa ter sol u bil ity, pKa, and mo lec u lar mass, since these her bi cides do not be long to the same chem i cal fam ily. On account of this, the re la tion ship be tween sorp tion and her bi cide prop er ties cited above was es tablished only for s-triazines. The s-triazine ad sorp tion showed a di rect re la tion ship with wa ter sol u bil ity, pKa and mo lec u lar mass of these com pounds on the stud ied soils. Key words: ad sorp tion, desorption, her bi cides, soils In tro duc tionMetolachlor, atrazine and ametryn are widely used as selective pre-and post-emergence herbicides for weed con trol in sugar cane, cit rus fruit, soy beans and other eco nom i cally im por tant crops in Brazil. Res i dues of these her bi cides are fre quently found in en vi ron mental samples of soil and water due to their persistence and rel a tively high wa ter sol u bil ity 1,2 .In for ma tion on the ad sorp tion and desorption po ten tial of her bi cides is needed un der cer tain cir cum stances to assess move ment and per sis tence in a soil en vi ron ment. Better un der stand ing of these pro cesses wil...

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Section: Ad Sorp Tion Iso Thermsmentioning

confidence: 99%

HRGC study of sorption and desorption of atrazine, ametryn and metolachlor on Brazilian soils

Queiroz¹,

Lanças²

1997

J. Braz. Chem. Soc.

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“…For the study of desorption, rather than use the method of Swanson and Dutt (1973) which consists of successively diluting the solution in contact with a solid covered with a given adsorption layer and measuring the remaining adsorption after 2 hr of agitation, a method was adopted closer to the method of study of the adsorption evolution with time. Six or seven samples of silica covered with a known quantity of carbofuran, freshly centifugated from their equilibrium solution, are each mixed with 10 ml water.…”

Section: Kinetics Of Adsorption and Desorptionmentioning

confidence: 99%

Adsorption Mechanisms of Carbofuran on Silica: Structure, Kinetics, and Solubility Influence

Méar

Saint

Privat

1996

Ecotoxicology and Environmental Safety

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“…This can be attributed to irreversibility or hysteresis during desorption. This is a common trend and has been reported for the desorption of a number of pesticides like atrazine (Swanson and Dutt, 1973;Raman et al, 1988), prometryn (Murray et al, 1975 andLaFleur, 1976), thiabendazole (Aharonson and Kafkafi, 1976), napropamide (Wu et al, 1975), 2,4,5-T (Koskinen et al, 1979;Koskinen and Cheng, 1983), fluormetryn (Savage and Wauchope, 1974) and parathion (Saltzman et al, 1972).…”

Section: Resultsmentioning

confidence: 61%

Desorption of soil‐applied metoxuron from four soils of hyderabad

Raman

Patnaik

1994

Toxicological & Environmental Chemistry

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Adsorption and desorption of metoxuron (3-(3-chloro, 4-methoxyphenyl)-1, 1-dimethyl urea) was studied on two black and two red soils from Hyderabad, India, at 27 ± 1°C. Desorption was carried out by successive withdrawal of 5 mL of the supernatant and replacement by 0.01 M CaCl 2 solution. Desorption was accompanied by hysteresis in all the soils although the degree of irreversibility was lower in the red soils with lower clay and organic matter content. Desorption isotherms were closer to adsorption isotherms when the initial concentration of adsorbed metoxuron was low. Thus at the concentration used in weed control, large accumulation of metoxuron in "bound" or unavailable form does not appear to be serious.

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Chemical and Physical Processes that Affect Atrazine and Distribution in Soil Systems

Cited by 84 publications

References 0 publications

HRGC study of sorption and desorption of atrazine, ametryn and metolachlor on Brazilian soils

HRGC study of sorption and desorption of atrazine, ametryn and metolachlor on Brazilian soils

Adsorption Mechanisms of Carbofuran on Silica: Structure, Kinetics, and Solubility Influence

Desorption of soil‐applied metoxuron from four soils of hyderabad

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