Binding of a herbicide to water-soluble soil humic substances

doi:10.1016/0048-9697(92)90105-2

Science of The Total Environment

Volumes 117–118, 30 May 1992, Pages 393-401

https://doi.org/10.1016/0048-9697(92)90105-2 Get rights and content

Abstract

Dissolved organic matter (DOM) can act as a sorbent for organic chemicals in soils and natural waters. Therefore, distribution of an environmental chemical in soil is determined by a three compartment system of bulk soil matrix, water, and colloidal or dissolved organic matter. In the present study we demonstrate the binding of a new herbicide to DOM. Ultrafiltration techniques allowed the separation of two dissolved fractions of the free herbicide and the herbicide bound to DOM. Ion composition and pH exert a decisive influence on the sorption processes. An effective sorption isotherm is calculated, which takes into account the sorption onto DOM. Implications of the results on the movement of the herbicide in soils are discussed.

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The β isomer of 1,2,3,4,5,6-hexachlorocyclohexane (β-HCH) which is formed during synthesis of the pesticide lindane shows high mobility in polluted soils despite its low water solubility. Therefore, we studied the correlation between the quantity and quality of dissolved organic matter (DOM) and the mobilization and transport of β-HCH in two soil profiles used as grassland and in incubation experiments. From our results we conclude that β-HCH was mobilized and transported to deeper soil horizons probably by coupling between β-HCH and DOM. The interaction of β-HCH with DOM as indicated by the measured high partition coefficient between β-HCH and DOM (logK_DOC = 4.39) was much higher than would be expected from the physicochemical properties of β-HCH. As suggested from synchronous fluorescence spectroscopy data, the capacity of DOM to bind β-HCH increases as the more extended aromatic regions of DOM are accessible in the aqueous extracts. The addition of lime and fresh organic matter to the grassland soils did not affect the measured coupling between β-HCH and DOM. Long drying periods increased the coupling up to 9.9 μg β-HCH per mg DOC. Water-logging destroyed the binding between DOM and β-HCH despite increasing DOC contents. Our main conclusion is that qualitative differences in DOM due to changed environmental conditions can drastically change the coupling of hydrophobic organic pollutants to DOM and greatly affect polltant mobilization and translocation.
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Science of The Total Environment

Binding of a herbicide to water-soluble soil humic substances

Abstract

Evaluation of ultrafiltration for determining molecular weight of fulvic acid

Environ. Sci. Technol.

Characterization of soluble organic matter in leachate

Environ. Sci. Technol.

Untersuchungen zur Sorption eines neuen Herbizids an die ApHorizonte verschiedener Ackerböden und deren wasserlösliche organische Bodensubstanz

Bayreuther Bodenk. Ber

Sorption behavior of a new acidic herbicide in soils

Chemosphere

Solution phase complexing of Atrazine by fulvic acid: a theoretical comparison of ultrafiltration methods

Anal. Chem.

Continuous flow method for studying adsorption of organic chemicals by humic acid preparation

Chem. Ind.

Chromatographische (GPC, RP-HPLC) und spektroskopische (IR, 13C-NMR) Kennzeichnung wasserlöslicher organischer Bodensubstanzen aus Waldhumus

Bayreuther Bodenk. Ber.

̄-HCH mobilization in polluted wetland soils as influenced by dissolved organic matter

Assessing interactions between the soil foodweb and a strain of Pseudomonas putida genetically engineered to degrade 2,4-D

Abiotic and biotic factors that influence the bioavailability of gold nanoparticles to aquatic macrophytes

Fate and stability of nonextractable residues of [<sup>14</sup>C]PAH in contaminated soils under environmental stress conditions

The role of dissolved organic matter, particularly free amino acids and humic substances, in freshwater ecosystems

Chromatographische (GPC, RP-HPLC) und spektroskopische (IR, ¹³C-NMR) Kennzeichnung wasserlöslicher organischer Bodensubstanzen aus Waldhumus