Abstract
During this study, a groundwater screening tool was developed to assess the temporal risk of groundwater contamination from the use of pesticides. It is based on a source, vector, target approach. The method utilised in this study uses a semi-quantitative probabilistic risk assessment where the input parameters were classified and assigned a relative score from 1 to 5 (i.e. 1 = no risk and 5 = high risk). The model was parameterised by using national data and calibrated with 2 years of national pesticide groundwater monitoring data. After calibration, two specific sites were selected for model validation. Based on the presence of the source, vector and target, the evaluation indicated that the temporal risk is site specific (i.e. May to December for the country model, June to September for the Oak Park site and September for the Castledockrell site). A sensitivity analysis performed on the national scale revealed that the groundwater vulnerability category (gv), the clay content (cc%), the persistence of pesticides in soil (DT50) and the rainfall represented by wet day (wd) were the most important parameters that affected model predictions (correlation coefficients of 0.54, −0.39, 0.35 and 0.31, respectively), highlighting the importance of soil hydrogeological conditions, soil type and rainfall in influencing water model predictions. The model developed can help to identify the temporal risk from pesticides to groundwater and guide regulators in highlighting at-risk periods, therefore allowing more focused monitoring programmes.
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Abbreviations
- A :
-
Application rate
- AC:
-
Soil air content
- AF:
-
Attenuation factor
- BD:
-
Bulk density
- BW:
-
Body weight
- C :
-
Water consumption
- cc%:
-
Score for texture
- CF1, CF2 and CF3 :
-
Weighting factor for the source, vector and target, respectively
- CEC:
-
Commission of the European Communities
- DAFF:
-
Department of Agriculture, Fisheries and Food
- DAFM:
-
Department of Agriculture, Food and the Marine
- dgw:
-
Depth to groundwater
- DT50 :
-
Pesticide half-life in soil
- E :
-
Evapotranspiration
- EC:
-
Effective concentration
- ED50 :
-
Effective dose
- EF:
-
Model efficiency
- EPA:
-
Environmental Protection Agency
- ER:
-
Effective precipitation
- EU:
-
European Union
- FC:
-
Soil field capacity
- g :
-
GUS score
- Gr:
-
Groundwater recharge
- gv:
-
Score for groundwater vulnerability category
- GUS:
-
Groundwater ubiquity score
- H :
-
Thickness of water table
- I :
-
Chemical intake
- K H :
-
Henry’s law constant
- k oc :
-
Soil sorption coefficient
- LD50 :
-
Lethal dose
- LC50 :
-
Lethal concentration
- LQ:
-
Leached quantity
- LOAEL:
-
Lowest observed adverse effect level
- m :
-
Pesticide application month
- NOAEL:
-
No observed adverse effect level
- NOEC:
-
No observed effect concentration
- NOEL:
-
No observed effect level
- P :
-
Porosity
- PCS:
-
Pesticide Control Service
- PD:
-
Particle density
- PEC:
-
Predicted Environmental Concentration
- PPP:
-
Plant Protection Products
- Pr:
-
Precipitation
- R :
-
Risk ratio value
- RC:
-
Recharge coefficient
- RF:
-
Retardation factor
- R s :
-
Overall month risk score
- S :
-
Score for source
- s oc :
-
Soil organic carbon content of soil
- T :
-
Score for target
- t :
-
Number of days following the application month
- TER:
-
Toxicity exposure ratio
- tp:
-
Score for temperature
- wd:
-
Score for wet day
- V :
-
Score for vector
- WHO:
-
World Health Organization
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Acknowledgments
The authors would like to thank the Irish Department of Agriculture, Food and the Marine (DAFM) under the Research Stimulus Fund. The authors are also grateful to Mannix A from the EPA and McManus SL from Trinity College who provided monitoring data at national and site scales, respectively.
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This article has been retracted by the Editor-in-Chief because the authors did not have permission (implicit or explicit) to publish the data used to validate the model, which was unpublished and was not contained in the cited unpublished PhD thesis by Sarah McManus (Trinity Centre for the Environment, Dublin, Ireland). Given the copyright and authorship issues involved, the Environmental Monitoring and Assessment article in question is being retracted. The authors apologize for their negligence.
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Labite, H.E., Cummins, E. RETRACTED ARTICLE: Development of a screening tool to assess the temporal risk of pesticides leaching to groundwater using the source, target, vector approach. An Irish case study for shallow groundwater. Environ Monit Assess 187, 91 (2015). https://doi.org/10.1007/s10661-015-4325-9
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DOI: https://doi.org/10.1007/s10661-015-4325-9