**Interactions Between Ionic Pesticides and Model Systems for Soil Fractions**

Florencio Arce1, Ana C. Iglesias2, Rocío López1, Dora Gondar1, Juan Antelo3 and Sarah Fiol1 *1Department of Physical Chemistry, University of Santiago de Compostela, 2Eurofins Analtico BV, 3Department of Soil Science and Agricultural Chemistry, University of Santiago de Compostela, Spain* 
