Effects of dissolved organic matter on the desorption of Cd in freeze–thaw treated Cd-contaminated soils

Ming, Lian; Li, Linhui; Zhang, Yingxin; Lin, Weiyun; Wang, Guanzhu; Zhang, Sai

doi:10.1080/02757540.2013.817566

Cited by 12 publications

(6 citation statements)

References 28 publications

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“…One possible reason is due to the notable impact of FT on the soil pH35, which is highly related to the Cd mobility and most of the Cd fractions14. FT can alter the number of soil sorption sites of H + based on destroyed soil aggregates or gathered fine36.…”

Section: Discussionmentioning

confidence: 99%

“…The results of the FT-CP experiments showed that A-Cd , M-Cd and all six Cd fractions fluctuated with the FT frequency, increasing in soils both with and without CP. One possible reason is due to the notable impact of FT on the soil pH 35 , which is highly related to the Cd mobility and most of the Cd fractions 14 . FT can alter the number of soil sorption sites of H + based on destroyed soil aggregates or gathered fine 36 .…”

Section: Discussionmentioning

confidence: 99%

“…The increased OM can reduce the rate of reversibly sorbed Cd transfer into the irreversibly sorbed fractions, whereas the transfer rate increases with increasing temperature 34 . Cd desorption by DOM is easily promoted by FT due to the decreases in soil pH and the free iron oxides content 35 . Moreover, the impact of FT increases with the increasing FT frequency, i.e., acting time 20 .…”

Section: Discussionmentioning

confidence: 99%

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Role of freeze-thaw cycles and chlorpyrifos insecticide use on diffuse Cd loss and sediment accumulation

Wang

Ouyang

Hao

et al. 2016

Sci Rep

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Freeze-thaw cycles are predicted to increase in cold temperate regions. The potential influence of the interactions of freeze-thaw cycles and agrochemicals on the release of Cd into river water is unknown. In this study, the interactions of freeze-thaw cycles and chlorpyrifos (FC) on Cd mobility in soils were analysed. The spatial variability of soil Cd under long-term intensive tillage in a freeze-thaw agro-system was also identified. The temporal variation of sediment Cd was detected based on analysis of the sediment geochemistry. The results showed that FC increased soil Cd mobility, with an increase of approximately 10% in CaCl2-extractable Cd. The increased mobile fractions of water-soluble and exchangeable Cd originated from the decreased fraction of Fe-Mn-oxide-associated Cd and organic matter-bound Cd. The total Cd content in the surface soil followed the zonally decreasing trend of dry land > paddy land > natural land. The Cd concentrations and sedimentation rates of the sediment core generally increased from 1943 to 2013 due to agricultural exploration and farmland irrigation system construction, indicating an increase of the Cd input flux into water. The results provide valuable information about the soil Cd transport response to the influence of climatic and anthropogenic factors in cold intensive agro-systems.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Role of freeze-thaw cycles and chlorpyrifos insecticide use on diffuse Cd loss and sediment accumulation

Wang

Ouyang

Hao

et al. 2016

Sci Rep

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“…Moreover, FTCs are important functions for the transform of heavy metals from organic or Fe-Mn oxides fractions to exchangeable fractions [30,31]. However, most studies adopted extreme freeze-thaw conditions; for example, the researchers usually adopted −25 °C as freezing temperature and 20 °C as thawing temperature [25,32].…”

Section: Introductionmentioning

confidence: 99%

Lead and Chromium Immobilization Process Subjected to Different Freeze-Thaw Treatments in Soils of the Northeastern Qinghai-Tibet Plateau

2021

Journal of Chemistry

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The freeze-thaw cycle is one of the important processes that affected heavy metal behaviors in soil. However, information regarding the adsorption and desorption behavior of heavy metals in soils under different freeze-thaw conditions is relatively less. Therefore, different freeze-thaw conditions including unfrozen, 15 freeze-thaw cycles at 60% water content, and 15 freeze-thaw cycles at 100% water content were investigated. Then the adsorption and desorption behaviors of Pb and Cr in freeze-thaw soils were studied. Results showed the Pb and Cr adsorption amount mostly decreased with increasing water-soil ratio, and the soil performance of Pb and Cr adsorption at same water-soil ratios showed variation under different freeze-thaw conditions. The Pb isothermal adsorption was higher for most freeze-thaw treatments compared to the control. The soil performance of Cr isothermal adsorption showed variation under different freeze-thaw conditions. Most electrostatic binding of Pb and Cr were stronger under unfrozen and freeze-thaw conditions than unfrozen conditions. Most Pb and Cr adsorption kinetics patterns of freeze-thaw treated soils were rapid than unfrozen conditions. These results implied that freeze-thaw cycles could change the soil adsorption and desorption patterns of Pb and Cr. Therefore, further studies are urgently needed to investigate Pb and Cr immobilization mechanisms in soils during freeze-thaw cycles. Hence, these findings provided useful information on Pb and Cr immobilization process in soils that underwent freeze-thaw cycles to offer an additional insight into predicting Pb and Cr behaviors in cold and freezing environments.

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“…In this study, the soils used were thus spiked simultaneously with lead, zinc, and cadmium. These metals were chosen as lead, zinc, and cadmium are three of the most common pollutants in contaminated sites and can all do great harm to human health due to their high toxicity and enrichment ability [ 50 , 51 , 52 , 53 ]. Subsequently, the prepared samples were subjected to freezing and thawing of up to 90 cycles to examine the ongoing durability of S/S contaminated soil under long-term F-T conditions.…”

Section: Introductionmentioning

confidence: 99%

Effects of Long-Term Freeze–Thaw Cycles on the Properties of Stabilized/Solidified Lead-Zinc-Cadmium Composite-Contaminated Soil

Zhong

Chang

Wang

et al. 2021

IJERPH

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Lead, zinc, and cadmium were used to prepare a composite-contaminated soil to replicate common situations, in which soil is usually simultaneously contaminated by multiple metals. To examine the long-term durability of stabilized/solidified (S/S) contaminated soil, specimens were subjected to a series of freeze–thaw (F-T) cycles, up to ninety times (one day per cycle), prior to testing. Triaxial compression tests, soil column leaching tests, and X-ray diffraction analysis were then employed to study the mechanical properties, environmental influences, and micro-mechanisms of the S/S lead-zinc-cadmium composite-contaminated soils after long-term F-T. The results showed that triaxial compressive strength increases within three F-T cycles, then decreases before slightly increasing or stabilizing after thirty F-T cycles. The stage of decreased cohesion thus occurs between three and fourteen F-T cycles, with variation in other factors similar to that of the triaxial compressive strength. The cohesion mainly increases between three and seven cycles. The soil column leaching test showed that the permeability of soil is more than four times higher than that of soil not subject to freeze–thaw cycles after ninety F-T cycles. XRD tests further revealed that the chemical composition of S/S contaminated soil and the occurrence of each heavy metal (HM) remained unchanged under F-T treatment.

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Effects of dissolved organic matter on the desorption of Cd in freeze–thaw treated Cd-contaminated soils

Cited by 12 publications

References 28 publications

Role of freeze-thaw cycles and chlorpyrifos insecticide use on diffuse Cd loss and sediment accumulation

Role of freeze-thaw cycles and chlorpyrifos insecticide use on diffuse Cd loss and sediment accumulation

Lead and Chromium Immobilization Process Subjected to Different Freeze-Thaw Treatments in Soils of the Northeastern Qinghai-Tibet Plateau

Effects of Long-Term Freeze–Thaw Cycles on the Properties of Stabilized/Solidified Lead-Zinc-Cadmium Composite-Contaminated Soil

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