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Browsing by Subject "Desethylatrazine (DEA)"

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  • Lawal, Abib (2024)
    This study investigated the dynamics of pesticide dissipation in groundwater under different flow conditions. The research mainly focused on the dissipation processes and the mobility of some commonly used pesticides, which include atrazine, simazine, deisopropylatrazine (DIA), desethylatrazine (DEA), hexazinone and 2,6-dichlorobenzamide (BAM). Groundwater, as one of the most important sources of fresh water, faces the risk of contamination from mainly agricultural, urban, and other human activities, particularly the use of pesticides. The transportation, dissipation, and persistence of these pesticides in subsoil significantly impact the quality of groundwater and, by extension, pose a danger to both humans and ecosystems [1] [2]. By applying a controlled experimental setup in the Laune groundwater zone, this study observed the pesticide concentrations over 223 days, using solid phase extraction followed by GC-MS analysis. The research hypothesized that changes in the groundwater flow rate significantly affected pesticide dissipation rates. The results of the findings showed distinct dissipation patterns for the observed pesticides with a marked concentration peaking on day 53 and 64, depending on the pesticides, which are then followed by different temporal dynamics after pump adjustments. Remarkably, atrazine, simazine, DIA, DEA, and hexazinone exhibited significant changes in concentration in response to pump adjustments, whereas BAM concentration persisted, suggesting minimal or no impact. These findings highlighted the complex relationship between groundwater flow rates and the pesticide dissipation process. This underscores the importance of environmental behavior in groundwater system. The study was able to contribute to the understanding of pesticides’ fate in groundwater, offering insight into future remediation strategies and regulatory considerations for the safety of groundwater.