Department of Analytical Chemistry;
Faculty of Sciences;
Campus Miguel Delibes;
University of Valladolid;
Paseo de Belen 7;
47012 Valladolid;
Spain;
I.U.CINQUIMA;
Campus Miguel Delibes;
University of Valladolid;
Paseo de Belen 5;
47011 Valladolid;
Spain;
Department of Analytical Chemistry;
School of Industrial Engineers;
University of Valladolicl;
Francisco Mendizdbal 1;
47014 Valladolid;
Spain;