Interactions between Small Organic Chemicals and Soil Colloidal Constituents

Hayes, M.H.B.; Mingelgrin, U.

doi:10.1007/978-94-017-1909-4_11

Cited by 21 publications

(8 citation statements)

References 103 publications

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“…[15] In low-organic matter soils and sediments, clay minerals probably control sorption/desorption interactions. [16,17] Soil organic matter and clay minerals are often associated and, consequently, it is unclear how they individually affect the sorption capacity of soil for pesticides.…”

Section: Introductionmentioning

confidence: 99%

Atrazine sorption by hydroxy-interlayered clays and their organic complexes

Indraratne

Farenhorst

Goh

2007

Journal of Environmental Science and Health, Part B

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This study examined the sorption of atrazine by hydroxy-Fe interlayered montmorillonite (FeMt) and its hydroquinone (FeMtHQ), citrate (FeMtCt) and catechol (FeMtCC) complexes as well as by hydroxy-Al interlayered montmorillonite (AlMt) and its hydroquinone (AlMtHQ) and citrate (AlMtCt) complexes. Found among the clays were sorption distribution coefficients (K(d)) ranging from 24 to 123 mL g(-1) and maximum sorption (M) ranging from 2.2 to 16.8 microg g(-1). Both K(d) and M decreased in the order of FeMtCC > FeMtHQ > AlMtHQ > (AlMt = FeMt) > (AlMtCt = FeMtCt). The pH was negatively correlated with both K(d) (r = -0.90, p < 0.001) and M (r = -0.81, p < 0.001). When interlayered clays were associated with humified material (FeMtCC, FeMtHQ, AlMtHQ), both K(d) (r > 0.96, p < 0.01) and M (r > 0.94, p < 0.01) were highly positively correlated with total organic C and alkali-soluble C. However, clays with non-humified organic compounds (FeMtCt and AlMtCt) sorbed less atrazine than clays without any organic C (FeMt and AlMt). This suggests that functional groups of Fe-OH and Al-OH in FeMt and AlMt reduced the available sorption sites for atrazine by making complexes with citrate ions while forming FeMtCt and AlMtCt. The atrazine was sorbed through the hydrophobic interactions with organic compound surfaces as well as through H-bonding and ionic bonding with clay-mineral surfaces.

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Section: Introductionmentioning

confidence: 99%

Atrazine sorption by hydroxy-interlayered clays and their organic complexes

Indraratne

Farenhorst

Goh

2007

Journal of Environmental Science and Health, Part B

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“…However, little protonation of an adsorptive species can be expected at pH values 2 units above the pK a of the adsorbate (Hayes and Mingelgrin 1991). Atrazine with pKa of 1.68 should therefore be sorbed primarily as neutral molecules by homoionic A1-and Ca-smectite with much higher pH values than the atrazine pKa.…”

Section: Introductionmentioning

confidence: 99%

“…Because of the large surface area and common occurrence of smectites, they are important in controlling surface reactions of organic chemicals in these systems. Increasing concern with movement of these contaminants to groundwater has led to numerous investigations into their reactions and transport in soils, sediments and clay liners (Karickhoff 1980;Chiou et al 1983;Hayes and Mingelgrin 1991;Boyd and Jaynes 1994;Pignatello and Xing 1996;Sawhney 1996). Sorption of nonionic organic compounds by softs and sediments are generally considered to be related to the organic matter contents of these sorbents.…”

Section: Introductionmentioning

confidence: 99%

“…Sorption of nonionic organic compounds by softs and sediments are generally considered to be related to the organic matter contents of these sorbents. In low organic matter soils and sediments, however, clay minerals likely control the sorption/desorption interactions (Mingelgrin and Gerstl 1983;Hayes and Mingelgrin 1991). Investigations into sorption of organic contaminants of a wide range of hydrophobicities (Rebhun et al 1992) by clays and clay-humic complexes showed that adsorption constants for humic (organic) fraction was 8 to 20 times higher than the pure clay minerals.…”

Section: Introductionmentioning

confidence: 99%

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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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“…The aim of our preliminary study was on the one hand to identify which type of bonding can occur between the main families of contaminants and the constituents of soil matrix (see Table I) and on the other hand, to identify the main physico-chemical characteristics of soils which may influence these bindings. Table II shows the results of a comprehensive review (Hayes and Mingelgrin, 1991;Kishi and Hasimoto, 1990;Murphy et al, 1990;Calvet, 1989;Hassett and Banwart, 1989;Karickhoff et al, 1979). Quantification of the matrix effect in real cases of soil contamination In the analytical process (involving sampling, pre-treatment of the sample, extraction of the contaminant, quantification, validation and interpretation of the result as a global information), the pre-treatment step is often one of the weakest links of the analytical chain.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the pollutant‐matrix interaction in contaminated soils

Pépin

Baroudi

Nomine

2003

Management of Environmental Quality: An International Journal

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If you would like to write for this, or any other Emerald publication, then please use our Emerald for Authors service information about how to choose which publication to write for and submission guidelines are available for all. Please visit www.emeraldinsight.com/authors for more information. About Emerald www.emeraldinsight.comEmerald is a global publisher linking research and practice to the benefit of society. The company manages a portfolio of more than 290 journals and over 2,350 books and book series volumes, as well as providing an extensive range of online products and additional customer resources and services.Emerald is both COUNTER 4 and TRANSFER compliant. The organization is a partner of the Committee on Publication Ethics (COPE) and also works with Portico and the LOCKSS initiative for digital archive preservation.Abstract Supporting many policies of contaminated sites management, the risk assessment methodology needs a deep knowledge of the characteristics of the contamination of soils. Physicochemical analysis has to take in account the heterogeneity and the specificity of the soil. A better knowledge of the interactions between the chemical substances and the matrix should be developed and its influence on the measurement chain shall be determined. In particular, the influence on the final result of each of the analytical steps (pre-treatment, extraction, purification, analysis) has to be quantified. An experimental protocol has been designed to study the influence of the type of pre-treatment chosen in relation to the characteristics of the matrix of real contaminated soils by PCB and PAH. The results show and quantify how the texture, the granulometry, the water content and the total organic carbon (TOC) content may affect the analytical result depending on the analytical pre-treatment-step chosen. IntroductionThe management of contaminated land based on a risk assessment methodology for human and/or the environment is recognised as a realistic concept shared by many countries in Europe. This approach needs to have an extended knowledge of the contaminated soils characteristics, which is often the main source of pollution. Most of the time, the analytical result constitutes the essential information on which the quality and the relevance of the whole methodology rely.In 1997, the scientific council of the Network for Industrial Contaminated Land in Europe (NICOLE) has identified that one of the first priorities for environmental research was to sharpen the knowledge of the uncertainty of the analytical result, linked to the multiplicity of the contaminants and the heterogeneity of the soil matrix. In particular, the influence on the result of each step of the analytical process (pre-treatment, extraction, clean-up, measurement) has to be quantified with regard to the pollutant-matrix interaction.

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Interactions between Small Organic Chemicals and Soil Colloidal Constituents

Cited by 21 publications

References 103 publications

Atrazine sorption by hydroxy-interlayered clays and their organic complexes

Atrazine sorption by hydroxy-interlayered clays and their organic complexes

Sorption of Atrazine by Al- and Ca-Saturated Smectite

Characterization of the pollutant‐matrix interaction in contaminated soils

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