1. Faculty of Chemical Engineering and Agro-Industry; Ladrón de Guevara E11-253, Escuela Politécnica Nacional Quito 170525 Ecuador
2. Department of Chemistry; Michigan State University; East Lansing, MI 48824 USA
3. High School Honors Science Program (HSHSP); Michigan State University; East Lansing, MI 48824 USA
4. Charles University; Department of Analytical Chemistry; Prague 128 3 Czech Republic