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Título del libro: Water-Rock Interaction - Proceedings Of The 13th International Conference On Water-Rock Interaction, Wri-13
Título del capítulo: A zero-point system dynamics model of the fate of xenobiotics applied to ethylenethiourea in soil systems

Autores UNAM:
ANNE MARGRETHE HANSEN HANSEN;
Autores externos:

Idioma:
Inglés
Año de publicación:
2010
Palabras clave:

Abiotic oxidations; Biotic degradation; Bulk mass; Chemical degradation process; Decomposition kinetics; Degradation dynamics; Determination coefficients; Ethylenethiourea; Input parameter; Mass fraction; Overall-model; Soil systems; Submodels; System dynamics model; System models; Water volumes; Zero-point; Biochemistry; Degradation; Geologic models; Photodegradation; Soils; Sorption; Soil pollution


Resumen:

A zero-point system model was developed to simulate existing data on the fate of ethylenethiourea (ETU), a main metabolite of a group of fungicides with wide distribution, in soils. Submodels for sorption, photodegradation and abiotic oxidation were validated with data from literature, and incorporated in the overall model for biotic degradation in soil. The sorption submodel developed depends on temperature, pH, mass fractions of clay and organic matter, water volume, soil bulk mass and initial ETU concentration as input parameters. It was able to predict the apparent distribition coefficients for eight different soils from two publications with a R 2 of 0.992. The models for chemical degradation processes were able to simulate decomposition kinetics from various studies with a general R 2 > 0.99. The overall model was able to represent data on ETU degradation dynamics in bioactive soil with a determination coefficient of 0.9985. © 2010 Taylor & Francis Group, London.


Entidades citadas de la UNAM: