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Research
Limin Ma
Tongji University College of Environmental Science and Engineering
Corresponding Author
ORCiD: https://orcid.org/0000-0002-3819-2111
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Background: Environmental behavior of pesticide in soils is a key current research focus. Studying the adsorption characteristics of pesticides in soils as a parameter for evaluating the risk of groundwater pollution by pesticides, is commonly applied in agriculture. Results: In order to provide a theoretical basis for environment risk assessment and pollution remediation, the thermodynamics and kinetics of the equilibrium of atrazine adsorption in the Three Gorges Reservoir area were assessed and analyzed via batch experiments. Results showed that the sorption of atrazine was an exothermic and spontaneous process at temperatures of 298–318K. Atrazine was more easily adsorbed by soils at concentrations of 0–30 mg·L-1, with low temperature adsorption being more effective than high temperature adsorption. The adsorption of atrazine to the two assessed soils were well fitted by the Freundlich and Langmuir models. The adsorption kinetics of atrazine in soils were consistent with the quasi-second order kinetic model and intraparticle diffusion was found not to be the only control step. The monolayer adsorption occurred with non-uniform energy distribution on the soil surface, indicating that the adsorption of atrazine by the two kinds of soil was controlled by internal diffusion surface adsorption and liquid film diffusion, leading to the complexity of its adsorption kinetics. The values of standard free energy <0, indicated that the adsorption of atrazine in soils was spontaneous and dominated by physical adsorption. Changes in standard enthalpy ( ) indicated that the adsorption was exothermic. Conclusion: Atrazine exhibited a weak adsorption capacity in both soils, indicating it is highly mobile in the soil-water environment and can easily cause groundwater pollution. Therefore, much attention should be paid to the environmental behavior of pesticide soil moisture fluctuations, potentially leading to the broad transfer and spread of pollution.
Keywords
Soil; Atrazine; Water fluctuation zone; Kinetics; Sorption; Thermodynamics
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View the published article at Environmental Sciences Europe.
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Posted 03 Feb, 2020
No community comments so far
Editorial decision: Accept
On 08 Feb, 2020
Editor assigned
On 03 Feb, 2020
Submission checks complete
On 02 Feb, 2020
Editor invited
On 02 Feb, 2020
No comments provided
Editorial decision: Minor Revision
On 08 Jan, 2020
Review #2 received
Received 06 Jan, 2020
Review #1 received
Received 03 Jan, 2020
Reviewer #2 agreed
On 15 Dec, 2019
Reviewer #1 agreed
On 14 Dec, 2019
Reviewers invited
Invitations sent on 09 Dec, 2019
First submitted
On 06 Dec, 2019
Editor assigned
On 06 Dec, 2019
Submission checks complete
On 05 Dec, 2019
Editor invited
On 05 Dec, 2019
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Environmental Policy
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A new preprint design is coming!
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See the published version of this preprint at Environmental Sciences Europe.
This is a preprint, a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Learn more about In Review
Research
Limin Ma
Tongji University College of Environmental Science and Engineering
Corresponding Author
ORCiD: https://orcid.org/0000-0002-3819-2111
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
Peer Review Timeline
CURRENT STATUS: Published
View the published article at Environmental Sciences Europe.
Version 2
Posted 03 Feb, 2020
No community comments so far
Editorial decision: Accept
On 08 Feb, 2020
Editor assigned
On 03 Feb, 2020
Submission checks complete
On 02 Feb, 2020
Editor invited
On 02 Feb, 2020
No comments provided
Editorial decision: Minor Revision
On 08 Jan, 2020
Review #2 received
Received 06 Jan, 2020
Review #1 received
Received 03 Jan, 2020
Reviewer #2 agreed
On 15 Dec, 2019
Reviewer #1 agreed
On 14 Dec, 2019
Reviewers invited
Invitations sent on 09 Dec, 2019
First submitted
On 06 Dec, 2019
Editor assigned
On 06 Dec, 2019
Submission checks complete
On 05 Dec, 2019
Editor invited
On 05 Dec, 2019
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
Subject Areas
Environmental Policy
License:
This work is licensed under a CC BY 4.0 License. Read Full License
View the published article at Environmental Sciences Europe.
Background: Environmental behavior of pesticide in soils is a key current research focus. Studying the adsorption characteristics of pesticides in soils as a parameter for evaluating the risk of groundwater pollution by pesticides, is commonly applied in agriculture. Results: In order to provide a theoretical basis for environment risk assessment and pollution remediation, the thermodynamics and kinetics of the equilibrium of atrazine adsorption in the Three Gorges Reservoir area were assessed and analyzed via batch experiments. Results showed that the sorption of atrazine was an exothermic and spontaneous process at temperatures of 298–318K. Atrazine was more easily adsorbed by soils at concentrations of 0–30 mg·L-1, with low temperature adsorption being more effective than high temperature adsorption. The adsorption of atrazine to the two assessed soils were well fitted by the Freundlich and Langmuir models. The adsorption kinetics of atrazine in soils were consistent with the quasi-second order kinetic model and intraparticle diffusion was found not to be the only control step. The monolayer adsorption occurred with non-uniform energy distribution on the soil surface, indicating that the adsorption of atrazine by the two kinds of soil was controlled by internal diffusion surface adsorption and liquid film diffusion, leading to the complexity of its adsorption kinetics. The values of standard free energy <0, indicated that the adsorption of atrazine in soils was spontaneous and dominated by physical adsorption. Changes in standard enthalpy ( ) indicated that the adsorption was exothermic. Conclusion: Atrazine exhibited a weak adsorption capacity in both soils, indicating it is highly mobile in the soil-water environment and can easily cause groundwater pollution. Therefore, much attention should be paid to the environmental behavior of pesticide soil moisture fluctuations, potentially leading to the broad transfer and spread of pollution.
Figure 1
Figure 2
Figure 3
Figure 4
This is a list of supplementary files associated with this preprint. Click to download.
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