Leticia Ballesteros-Almonacid

Universitat Politècnica de València

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María-Elena Rodrigo-Clavero

Universitat Politècnica de València

Eduardo Cassiraga

Universitat Politècnica de València

Javier Rodrigo-Ilarri

Universitat Politècnica de València

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Universitat Politècnica de València

Universidad Nacional de La Plata

Universidad Dr. José Gregorio Hernández

M.Auezov South Kazakhstan State University

Abai Kazakh National Pedagogical University

Ministry of Education and Science of the Republic of Kazakhstan

Institute of Catalysis and Petrochemistry

Al-Farabi Kazakh National University

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Assessment of Groundwater Contamination by Terbuthylazine Using Vadose Zone Numerical Models. Case Study of Valencia Province (Spain)

International Journal of Environmental Research and Public Health (2020)

Javier Rodrigo-Ilarri María-Elena Rodrigo-Clavero Eduardo Cassiraga Leticia Ballesteros-Almonacid

Terbuthylazine is commonly used as an herbicide to control weeds and prevent non-desirable grow of algae, fungi and bacteria in many agricultural applications. Despite its highly negative effects on human health, environmental modeling of this kind of pesticide in the vadose zone till reaching groundwater is still not being done on a regular basis. This work shows results obtained by two mathematical models (PESTAN and PRZM-GW) to explain terbuthylazine behavior in the non-saturated zone of a vertical soil column. One of the models use a one-dimensional analytical formulation to simulate the movement of terbuthylazine through the non-saturated soil to the phreatic surface. The second and more complex model uses a whole set of parameters to solve a modified version of the mass transport equation considering the combined effect of advection, dispersion and reactive transport processes. Both models have been applied as a case-study on a particular location in South Valencia Aquifer (Spain). A whole set of simulation scenarios have been designed to perform a parameter sensitivity analysis. Despite both models leading to terbuthylazine's concentration values, numerical simulations show that PRZM-GW is able to reproduce concentration observations leading to much more accurately results than those obtained using PESTAN.

Terbuthylazine

10.3390/ijerph17093280

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