The Migration Pattern of Atrazine during the Processes of Water Freezing and Thawing

Atrazine, one of the most commonly used herbicides in the world, is of concern because of its frequent occurrence in various water bodies and the potential threat it constitutes to ecosystems. The transport of contaminants in seasonally ice-covered lakes is an important factor affecting the under-ic...

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Bibliographic Details
Published in:Toxics (Basel) 2022-10, Vol.10 (10), p.603
Main Authors: Zhang, Yan, Zhao, Chen, Yu, Aixin, Zhao, Wanli, Ren, Fangyun, Liu, Yucan
Format: Article
Language:English
Subjects:
Analysis
aquatic pollution
Atrazine
Contaminants
distribution characteristics
Experiments
Freeze-thaw
Freeze-thawing
Freezing
Freezing points
herbicide
Herbicides
Ice
Ice cover
Ice environments
Ice thickness
Lakes
Melting
Meltwater
Methods
Nitrogen
Pesticides
Photodegradation
Pollutants
Pollution control
Pollution transport
Thawing
Thickness
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Summary:Atrazine, one of the most commonly used herbicides in the world, is of concern because of its frequent occurrence in various water bodies and the potential threat it constitutes to ecosystems. The transport of contaminants in seasonally ice-covered lakes is an important factor affecting the under-ice water environment, and changes in phase during ice growth and melting cause redistribution of atrazine between ice and water phases. To explore the migration pattern of atrazine during freezing and thawing, laboratory simulation experiments involving freezing and thawing were carried out. The effects of ice thickness, freezing temperature, and initial concentration on the migration ability of atrazine during freezing were investigated. The results showed that the relationship between the concentration of atrazine in ice and water during freezing was ice layer < water before freezing < water layer under the ice. Atrazine tended to migrate to under-ice water during the freezing process, and the intensity of migration was positively correlated with the ice thickness, freezing temperature, and initial concentration. During the thawing phase, atrazine trapped in the ice was released into the water in large quantities in the early stages. The first 20% of meltwater concentration was significantly higher than the average concentration in ice, with the highest case being 2.75 times the average concentration in ice. The results reported in this study are a useful reference for planning possible pollution control measures on such lakes during their freeze-thaw process.
ISSN:2305-6304
2305-6304
DOI:10.3390/toxics10100603