1. Departmental
Management of Strategic
Research on Refining, PDVSA-Intevep, Los
Teques AP 76343, Bolivarian Republic of Venezuela
2. Departmental Management of Analytical
Chemistry, PDVSA-Intevep, Los Teques AP
76343, Bolivarian Republic of Venezuela
3. Electron Microscopy Center “Mitsou
Ogura”, Science Faculty, University Central of Venezuela, Caracas AP 47140, Bolivarian Republic of
Venezuela