Atrazine Adsorption by Some Soil Samples in Relation to Their Constituents

Abstract

Atrazine adsorption by some soil samples in relation to their constituents. Received June 1. 1988. Acta Agric. Scand. 38:293-301, 1988.Atrazine adsorption from 0.01 hi CaC12 solutions bas investigated using eleven soil samples from Denmark and Tanzania, and four "pure" soil constituents, i.e. EDTAextracted humic acid, montmorillonite. so-called amorphous iron oxides, and goethite. Considerable amounts of atrazine were adsorbed by the humic acid, whereas only negligible amounts were adsorbed by the srnectite and the iron oxides. AtrdZine adsorption by the humic acid, in the pH range 4-8, w s closely related to undissociated carboxyl and phenol groups, suggesting a rather specific adsorption mechanism, such as hydrogen bonding. For the soil samples, atrazine adsorption bas only significantly ( p~0 . 0 0 1 ) correlated with the organic matter (0.hl.) content, but much more atrazine w a s adsorbed by soil O.hf. than by the humic acid. Therefore, O.hl. seems to be the only atrazine-adsorbing constituent in the soil samples investigated and possibly also in many natural soils.

Chlorsulfuron Adsorption by Selected Soil Samples

“…Soil samples and pretreatnients All the soils as well as some of their adsorption properties have been described previously (Borggaard, 1981(Borggaard, , 1982(Borggaard, , 1983a(Borggaard, , b, 1984(Borggaard, , 1985(Borggaard, , 1986(Borggaard, , 1987Borggaard & Streibig, 19880). According to the FAO/Unesco classification system the soils include Acrisols (A6 and G 1 A), Cambisols (Asnres and HolmegHrd), Ferralsols (BuII 2B and FZ), Fluvisols (Dannemare), Gleysols (Farris 2), and Podzols (Norrliden).…”

Adsorption of Pesticides onto Quartz, Calcite, Kaolinite, and α‐Alumina

“…Earlier investigations have been carried out on the adsorption of atrazine to clays (Terce and Calvet, 1978; Borggaard and Streibig, 1988; Laird et al, 1992; Moreau‐Kervévan and Mouvet, 1998) and on the adsorption of atrazine to iron oxides (Borggaard and Streibig, 1988; Moreau‐Kervévan and Mouvet, 1998). The sorption of isoproturon to clays has been investigated by Terce and Calvet (1978) and Worrall et al (1996), and to chalk aquifers by Johnson et al (1998) Also, adsorption investigations of the ionic pesticide 2,4‐D have been carried out on clays (Frissel and Bolt, 1962; Aly and Faust, 1964; Weber et al, 1965; Hermosin and Cornejo, 1993; Sannino et al, 1997; Celis et al, 1999) and oxide minerals (Whatson et al, 1973; Kavanagh et al, 1980; Celis et al, 1999).…”

Atrazine, Isoproturon, Mecoprop, 2,4‐D, and Bentazone Adsorption onto Iron Oxides

“…Of the various inorganic aquifer components, clay minerals and oxides have the greatest potential for adsorption of pesticides due to the large surface area and the functional groups of these constituents (Bailey and White, 1970). Many studies have been done on the adsorption of pesticides to clays (Frissel and Bolt, 1962; Aly and Faust, 1964; Terce and Calvet, 1978; Borggaard and Streibig, 1988; Laird et al, 1992; Worrall et al, 1996; Sannino et al, 1997; Moreau‐Kervévan and Mouvet, 1998; Celis et al, 1999; Clausen et al, 2001), whereas less information is available on the adsorption of pesticides to iron oxides. The objective of this study is therefore to investigate the relative importance of sorption of pesticides to common iron oxides in aquifer sediments.…”