Adsorption of triazine herbicides on soil organic matter, including a short review on soil organic matter chemistry

Hayes, M.H.B.

doi:10.1007/978-1-4615-8464-3_6

Cited by 62 publications

(57 citation statements)

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“…Many works show that adsorption of organic chemicals in soils and sediments is often mainly due to organic matter. Several reviews have been published on the subject (2,105,106).…”

Section: Properties Of Adsorbentsmentioning

confidence: 99%

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Adsorption of Organic Chemicals in Soils

Calvet¹

1989

Environmental Health Perspectives

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This paper presents a review on adsorption of organic chemicals on soils sediments and their constituents. The first part of this review deals with adsorption from gas and liquid phases and gives a discussion on the physical meaning of the shape of adsorption isotherms. Results show that no general rules can be proposed to describe univocally the relation between the shape of isotherms and the nature of adsorbateadsorbent system. Kinetics of adsorption is discussed through the description of various models.Theoretical developments exist both for the thermodynamics and the kinetics of adsorption, but there is a strong need for experimental results. Possible adsorption mechanisms are ion exchange, interaction with metallic cations, hydrogen bonds, charge transfers, and London-van der Waals dispersion forces/ hydrophobic effect. However, direct proofs of a given mechanism are rare. Several factors influence adsorption behavior. Electronic structure of adsorbed molecules, properties of adsorbents, and characteristics of the liquid phase are discussed in relation to adsorption. Such properties as water solubility, organic carbon content of adsorbing materials, and the composition of the liquid phase are particularly important. Evaluation of adsorption can be obtained through either laboratory measurements or use of several correlations. Adsorption measurements must be interpreted, taking into account treatment of adsorbent materials, experimental conditions, and secondary phenomena such as degradations. Correlations between adsorption coefficients and water-octanol partition coefficient or water solubility are numerous. They may be useful tools for prediction purposes. Relations with transport, bioavailability, and degradation are described.

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“…Many works show that adsorption of organic chemicals in soils and sediments is often mainly due to organic matter. Several reviews have been published on the subject (2,105,106).…”

Section: Properties Of Adsorbentsmentioning

confidence: 99%

“…Degradation of organic chemicals may be due to chemical decomposition or to biological transformations. It is known, for instance, that clays and humic substances favor the hydrolysis of atrazine (105). Modifications due to adsorption can influence adsorption and desorption.…”

Section: Measuring Adsorptionmentioning

confidence: 99%

Adsorption of Organic Chemicals in Soils

Calvet¹

1989

Environmental Health Perspectives

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“…cides by humic substances (Hayes 1970; The importance of humic substances in in- Khan 1972;Stevenson 1972)' These include fluencing the activity, behavior, bio-avail-ion exchange' hydrogen bonding, protonaability ind OegraOaUitity of herbicides in tion, charge transfer, ligand exchange, cosoils has been documented in recent reviews ordination through a metal ion, van der by Hayes (1970), Khan ( 1972), and Steven-Waals forces, and hydrophobic bonding' son (1972). Numerous reports have ap-Despite the considerable amount of repeared in the literature during the past dei-search undertaken, very little attention has ade indicating that humic substances, which been paid to the-equilibrium and kinetic represent the most active fraction of organic aspect of the problem.…”

Section: Introductionmentioning

confidence: 99%