Risk analysis of pesticides applied to rice paddies using RICEWQ 1.6.2v and RIVWQ 2.02 |
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Authors: | Dimitrios G Karpouzas Ettore Capri |
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Institution: | (1) Universita Cattolica del Sacro Cuore, Istituto di Chimica Agraria ed Ambientale, Sezione Chimica Vegetale, Via E. Parmense 84, Piacenza, 29100, Italy |
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Abstract: | Rice is commonly cultivated in Southern Europe in large river basins where the extensive use of herbicides may impact water
quality at basin scale level. Consequently, pesticide risk assessment would be more relevant when considering a rice cultivation
area as a whole. Accordingly, two watershed-scale scenarios were developed to represent the specific agronomic, water and
pesticide management practices of rice cultivation in Greece. These scenarios were utilized for the parameterization of the
rice water quality model (RICEWQ) 1.6.2v and the surface water model river water quality (RIVWQ) 2.02. in order to predict
the environmental concentrations of pesticides in groundwater (GW) and surface water (SW) systems within a rice area. The
annual average pesticide concentrations at 1 m depth, predicted by RICEWQ were used to assess the risk for GW contamination.
The predicted exposure concentrations derived through modelling and eco-toxicological endpoints obtained from the literature,
were used to calculate acute and long-term toxicity exposure ratios (TERs) for aquatic organisms. Application of these scenarios
with RICEWQ and RIVWQ models enabled us to perform a risk assessment exercise for several herbicides registered in Greece
for use in rice. Such a risk assessment approach could be further scaled up to represent a whole rice cultivated basin in
order to be used for regulatory purposes. |
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Keywords: | Pesticide risk assessment Predicted environmental concentrations Rice herbicides RICEWQ model RIVWQ model |
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