Atrazine interactions with clay minerals: Kinetics and equilibria of sorption

Gilchrist, Glen; Gamble, Donald S.; Kodama, Hideomi; Khan, Shahamat U.

doi:10.1021/jf00034a043

Cited by 72 publications

(73 citation statements)

References 21 publications

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“…Complete reversibility of atrazine sorption by a number of Ca-saturated smectites at pH ranging from 4.75 to 6.45 (Laird et al 1992) support the above inference. Reversible sorption of atrazine by Na-and Ca-saturated montmorillonite, kaolinite and illite clay slurries at pH 5.1 has also been observed by Gilchrist et al (1993). The absence of any dealkylated or hydrolyzed atrazine species even after the 127-d reaction period (Gilchrist et al 1993) further corroborates the conclusion that atrazine is sorbed as neutral molecules by the homoionic smectite samples used here.…”

Section: Methodssupporting

confidence: 81%

Sorption of Atrazine by Al- and Ca-Saturated Smectite

Sawhney

1997

Clays and clay miner.

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Abstract--Because of the large surface area and common occurrence of smectites in the clay fractions, they are important in sorption/desorption reactions of organic pollutants entering soils and sediments. Results of sorption and desorption of atrazine by A1-and Ca-saturated smectite reported here showed that Al-saturated smectite sorbed much higher amounts of atrazine than Ca-saturated smectite. Al-saturated smectite sorbed 3820 mg kg -1 as compared to 1902 mg kg ~ by the Ca-saturated smectite during 5 consecutive sorptions from 10 ppm atrazine solution. Sorption isotherms over 2-10 ppm atrazine concentration range were nonlinear in all cases. Freundich coefficients, Kf, obtained from the sorption isotherms were much higher for A1-than Ca-saturated smectite; Kf varied from 405 to 3035 for Al-saturated and 100 to 306 for Ca-saturated. The pH values of A1-and Ca-saturated smectites were 3-4 units higher than the pK a (1.68) of atrazine, which suggests that atrazine was sorbed as neutral molecules. Stronger H-bonding between the more polarized H20 associated with the trivalent A1 ion than the divalent Ca ion is likely responsible for the greater sorption by Al-smectite.

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Section: Methodssupporting

confidence: 81%

Sorption of Atrazine by Al- and Ca-Saturated Smectite

Sawhney

1997

Clays and clay miner.

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“…The role of minerals on atrazine adsorption in soil is not well documented. Gilchrist et al (1993) found that the adsorption capacity of clays for atrazine followed the order of montmorillonite > illite > kaolinite.…”

Section: Introductionmentioning

confidence: 99%

The interaction between atrazine and the mineral horizon of soil: a spectroscopic study

et al. 2017

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Purpose In this paper, an attempt was made to explain the long-lasting occurrence of atrazine in soil. Despite the fact that this herbicide has been banned in European Union 10 years ago, it is still detected in the environment. Materials and methods Soil samples (organic and mineral horizon), SiO 2 and Al 2 O 3 sorbents were spiked with atrazine. The ultrasound-assisted extraction coupled with gas chromatography-electron capture detector was performed to establish the atrazine recovery depending on the type of soil horizon and sorbent. Fourier transform infrared spectroscopy (FTIR) analysis was conducted to determine the type of interactions between atrazine and sorbents. Results and discussion The atrazine recovery was lower for the mineral horizon (15%) compared to the organic horizon (63%). This finding suggests an interaction between atrazine and the mineral components of soil. Therefore, attempts have been made to explain atrazine's interaction with the main mineral components of soil, SiO 2 and Al 2 O 3 , and to investigate the influence of pH on atrazine's behaviour in soil. The atrazine recoveries were 86.5 and 10.7% for Al 2 O 3 and SiO 2 , respectively. The obtained results demonstrated that the protonated atrazine exhibits stronger interactions with the soil mineral layer (recovery below 0.1%) in comparison to molecular form of atrazine (recovery 86%). FTIR results suggested interactions between atrazine and SiO 2 . FTIR analysis revealed that 1,3,5-azidine ring interacts with SiO 2 molecule. Conclusions In acidic soil, atrazine remediation is limited, especially if the soil contains minerals with high SiO 2 contents. This situation may cause the long-lasting persistence of atrazine in soil.

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“…The contribution of clay minerals to the adsorption of organic molecules in soil has been the object of several studies (e.g., Mortland 1970, 1976, Pusino et al 1991, Laird et al 1992, Gilchrist et al 1993, Weber 1993. Of the various soil clay constituents, smectites have the greatest potential for adsorption of pesticides due to their large surface area and abundance in agricultural soils (Laird et al 1992).…”

Section: Introductionmentioning

confidence: 99%

Adsorption Mechanisms of Imazamethabenz-Methyl on Homoionic Montmorillonite

Pusino

Gelsomino

Gessa

1995

Clays and clay miner.

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Almtraet --The adsorption of the herbicide imazamethabenz-methyl, a mixture of the two isomers methyl (_+)-2-[4,5-dihydro-4-methyl-4-(1 -methylethyl)-5-oxo-1H-imidazol-2-yl]-4-methylbenzoate (para isomer) and methyl (+_)-2-[4,5-dihydro-4-methyl-4-(1 -methylethyl)-5-oxo-1H-imidazol-2-yl]-5-methylbenzoate (meta isomer), from water onto AP +-, Fe 3+-, Ca 2+ -, K +-and Na+-montmorillonite was studied by analytical (HPLC) methods. The adsorption from an organic solvent was also investigated by spectroscopic (IR) and X-ray diffraction measurements. It was observed that, depending on the acidic properties of the exchangeable cations, two different mechanisms may take #ace. The first one, acting on Fe a+-and AI a+-clays, involves the protonation of the more basic nitrogen atom ofimidazolinone ring of the herbicide because of a proton transfer from the acidic metal-bound water, followed by adsorption on the clay surfaces. In this case, the clay surfaces have greater affinity for the meta than the para isomer, due to the extra-stabilization of the meta protonated form by resonance. The second mechanism, taking place on Ca 2 § -, K +-and Na +-clays, is hydrogen-bond formation between the ester carbonyl group of the herbicide and hydration water metal ions and is not affected by the structure of the isomers.

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Atrazine interactions with clay minerals: Kinetics and equilibria of sorption

Cited by 72 publications

References 21 publications

Sorption of Atrazine by Al- and Ca-Saturated Smectite

Sorption of Atrazine by Al- and Ca-Saturated Smectite

The interaction between atrazine and the mineral horizon of soil: a spectroscopic study

Adsorption Mechanisms of Imazamethabenz-Methyl on Homoionic Montmorillonite

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