Sorption Mechanisms of Chemicals in Soils

Strawn, Daniel G.

doi:10.3390/soilsystems5010013

Cited by 95 publications

(38 citation statements)

References 129 publications

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“…Conclusions from several previous studies were derived from sorption behavior of the organic compounds in low concentration ranges (19,26,39). Although organic compounds in lower solution concentrations might exhibit linear sorption behavior, non-linear behavior is often observed in higher concentrations, which could alter the measured sorption capacity (33). Data from this study is consistent with studies showing a positive relationship between OC and ciprofloxacin sorption with pH-independent charges playing a critical role.…”

Section: Discussionsupporting

confidence: 83%

“…Sorption of organic molecules to soil particles is driven by hydrophobic effect, coulombic attraction resulting in van der Waals forces, or cation bridging. Mechanisms include cation exchange, outer-& inner-sphere adsorption, and precipitation on mineral surfaces (33,34). Sorption in soil is affected by the chemical nature of the compound and the soil, including functional groups, charge and pH of the reaction mixture, soil CEC, and quantity and types of clay minerals, organic compounds, and metal ions in the soil.…”

Section: Discussionmentioning

confidence: 99%

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Clay Content Played a Key Role Governing Sorption of Ciprofloxacin in Soil

et al. 2022

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Ciprofloxacin is a broad-spectrum antibiotic of the fluoroquinolone class that is used to treat bacterial infections in both humans and animals. Antibiotics released into the environment can select for antibiotic-resistant microorganisms, which negatively affects human and animal healthcare. Understanding soil factors that govern the mobility of ciprofloxacin can facilitate the development of targeted efforts to mitigate potential negative impacts. The objectives were (1) to determine the sorption capacity of ciprofloxacin in soils under acidic conditions; and (2) to reveal relative importance of key soil factors that influence sorption of ciprofloxacin. Evaluations were conducted using 20 soil samples with diverse properties and different cultivation/vegetation history. Sorption capacity ranged from 8 to 141 g kg−1; distribution coefficient (Kd) ranged from 23 to 200 mL kg−1 soil; and soil organic carbon-water partitioning coefficient (Koc) values ranged from 54 to 2,146 mL g−1 organic carbon. Clay content and cation exchange capacity were the most significant factors that influenced sorption capacity and Kd of ciprofloxacin with r values of 0.92*** and 0.64***, respectively. Soil pH had little effect on ciprofloxacin sorption parameters with r < 0.25. pH-independent charges played a predominant role dictating sorption parameters of ciprofloxacin in soil. Cation exchange via interlayer adsorption was a primary sorption mechanism under acidic conditions. Sorption parameters were significantly correlated with organic carbon content in cultivated soils only, resulting in r values of 0.97*** (with sorption capacity) and 0.72*** (with Kd). Cultivation led to changes in the quality of soil organic matter, resulting in changes in the sorption behavior and altered mechanisms of ciprofloxacin sorption in soil. Soils are effective in restraining the mobility of ciprofloxacin through adsorption and the effectiveness increases with clay content.

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Section: Discussionsupporting

confidence: 83%

Section: Discussionmentioning

confidence: 99%

Clay Content Played a Key Role Governing Sorption of Ciprofloxacin in Soil

et al. 2022

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“…Owing to their high surface area and ubiquitous presence throughout sediments, oils, aquifers and oil reservoirs, clay minerals exert a strong control on transport of dissolved ions and fluids in the sub-surface [1]. Although much research has highlighted the importance of layer charge and type of interlayer cation on the hydration and adsorption properties of clay minerals [2], less effort has focused on understanding how these properties might be affected under the anaerobic conditions typical for saturated soils and hydrocarbon reservoirs. In these reducing environments, structural Fe in clay minerals becomes reduced, increasing the clay mineral's layer charge, which is balanced by uptake of cations [3].…”

Section: Introductionmentioning

confidence: 99%

Effect of Structural Fe Reduction on Water Sorption by Swelling and Non-Swelling Clay Minerals

et al. 2022

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Ferruginous clay minerals in saturated soils and within hydrocarbon deposits often exist in a reduced state. Upon introduction of dissolved oxygen, or other oxidants, the clay minerals oxidise and changes in mineral surface charge and sorption capacity occur, resulting in changes in hydration as well as flux of intercalated species. Here we examine the sorption of water to the Fe-containing clay minerals nontronite NAu-2 (23 wt% Fe) and illite IMt-2 (7 wt% Fe) as a function of Fe oxidation state and exchangeable cations by means of water vapour volumetry and N2 surface area analysis. The clay minerals were chemically reduced using sodium dithionite. Sorption isotherms of water vapour and nitrogen, controlled relative humidity diffractograms, and chemical analyses were recorded. The results show that, after reduction using sodium dithionite, increased amounts of water vapour and nitrogen were adsorbed to the high Fe content nontronite, despite decreased interlayer separation. Little change was observed for the non-swelling and low Fe content illite. Sodium from the reducing agent was found to exchange with calcium present in the starting clay minerals, and sodium balanced the additional mineral charge generated during reduction. The findings presented in this study deliver improved understanding of sorption at the surface of the reduced clay minerals, which aid constrain the role of clay mineral interfaces in subsurface environments.

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“…The concept of sorption covers two phenomena: absorption, which is the ability of a substance to be absorbed by the entire volume of another substance (the absorbent); and desorption, which results in compaction of the sorbed substance only on the surface of the adsorbent [ 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

Sorption of Heavy Metals by Sewage Sludge and Its Mixtures with Soil from Wastewater Treatment Plants Operating in MBR and INR Technology

Kowalik

Widłak

Widłak³

2021

Membranes

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Sewage sludge is a very complex system, with solids and water. It is generated as waste from wastewater treatment. Sewage sludge is used to fertilize agricultural and forest areas and to rehabilitate devastated areas. It is a good organic fertilizer because it contains significant amounts of nutrients beneficial for plant development and humus-forming substances. The composition of sludge from municipal wastewater treatment plants is similar to soil organic matter, therefore it can be used to improve the physicochemical properties of soil, increasing its sorption capacity. Research material was collected in the Swietokrzyskie and Mazowieckie Voivodships. Sewage sludge was collected from the wastewater treatment plants in Sitkowka Nowiny (Sitkowka) and Kunow, as well as high-quality agricultural soil from Opatowiec and sandy-clay soil from Jastrzebie. Research was carried out on the sorption of heavy metals (Cd, Cr, Cu, Pb, Ni, Zn) by mixtures of sewage sludge with soil. The calculations were made for the concentrations of heavy metals in sewage sludge, soil, and sewage sludge–soil mixtures. The geoaccumulation index (Igeo) and the risk assessment code (RAC) were calculated. Increased sorption capacity was demonstrated in samples with a predominance of sewage sludge. It was shown that heavy metals from sewage sludge, after mixing with soil, changed their form from immobile to mobile.

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Sorption Mechanisms of Chemicals in Soils

Cited by 95 publications

References 129 publications

Clay Content Played a Key Role Governing Sorption of Ciprofloxacin in Soil

Clay Content Played a Key Role Governing Sorption of Ciprofloxacin in Soil

Effect of Structural Fe Reduction on Water Sorption by Swelling and Non-Swelling Clay Minerals

Sorption of Heavy Metals by Sewage Sludge and Its Mixtures with Soil from Wastewater Treatment Plants Operating in MBR and INR Technology

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