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The aim of this study was to investigate the total residual pesticide concentration in shallow groundwater of the Harran Plain in southeastern Turkey during the pre-irrigation (January 2021) and irrigation periods (July 2021). The current study is expected to reach results that may be an application opportunity for many lowland-type areas with characteristics similar to those of the region rather than only examining a local problem. Previous studies conducted in the region have addressed only one residual pesticide type in groundwater. In this study, total pesticide residues found in groundwater were identified, and their relationship with irrigation was tried to be explained. It is important to investigate the total number of pesticides in the groundwater of Harran Plain that threaten human health and to determine their contamination potential. In this context, measurements were made in 10 wells for two periods. In each sample, total concentrations of 150 residual pesticide species were analyzed. Analyses of pesticide species with different properties were performed in GC-MSMS (LOD value 0.0005 μg/L) and LC-MSMS (LOD value 0.0002 μg/L) devices for irrigation period, total pesticide amounts in 5 wells were detected between 0.217–0.903 μg/L and were found above the acceptable limits. The well GW4 has the highest total residual pesticide concentration before irrigation. From pre-irrigation to irrigation, total residual pesticide concentrations increased in all wells except GW9. Factors such as groundwater level being close to the ground, intensive agricultural production, excessive irrigation, and consequent intense vertical transport are among the most important causes of pesticide residues in wells. The reason for the decrease at the point of the dilution effect on pesticide concentrations explained GW9 as a result of the rising water level in the well. These wells stand out as sampling points where the polluting effects of excessive agricultural irrigation are seen as high residual pesticide concentrations. As a solution, irrigation alternatives that use less water should be selected. The realization of all these ways can be possible through farmer training.

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The Residual Pesticides in the Groundwater of the Harran Plain—The Irrigation Effect

  • 会议论文

  • 发表日期：

    2026年

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  • Benan Yazıcı Karabulut,
  • Ayşe Dilek Atasoy,
  • Mehmet İrfan Yeşilnacar

摘要

The aim of this study was to investigate the total residual pesticide concentration in shallow groundwater of the Harran Plain in southeastern Turkey during the pre-irrigation (January 2021) and irrigation periods (July 2021). The current study is expected to reach results that may be an application opportunity for many lowland-type areas with characteristics similar to those of the region rather than only examining a local problem. Previous studies conducted in the region have addressed only one residual pesticide type in groundwater. In this study, total pesticide residues found in groundwater were identified, and their relationship with irrigation was tried to be explained. It is important to investigate the total number of pesticides in the groundwater of Harran Plain that threaten human health and to determine their contamination potential. In this context, measurements were made in 10 wells for two periods. In each sample, total concentrations of 150 residual pesticide species were analyzed. Analyses of pesticide species with different properties were performed in GC-MSMS (LOD value 0.0005 μg/L) and LC-MSMS (LOD value 0.0002 μg/L) devices for irrigation period, total pesticide amounts in 5 wells were detected between 0.217–0.903 μg/L and were found above the acceptable limits. The well GW4 has the highest total residual pesticide concentration before irrigation. From pre-irrigation to irrigation, total residual pesticide concentrations increased in all wells except GW9. Factors such as groundwater level being close to the ground, intensive agricultural production, excessive irrigation, and consequent intense vertical transport are among the most important causes of pesticide residues in wells. The reason for the decrease at the point of the dilution effect on pesticide concentrations explained GW9 as a result of the rising water level in the well. These wells stand out as sampling points where the polluting effects of excessive agricultural irrigation are seen as high residual pesticide concentrations. As a solution, irrigation alternatives that use less water should be selected. The realization of all these ways can be possible through farmer training.