[1] Univ Autonoma Estado Hidalgo, Area Acad Quim, Carretera Pachuca Tulancingo Km 4-5, Mineral De La Reforma 42076, Hidalgo, Mexico
[2] Univ Autonoma Metropolitan Azcapotzalco, Dept Mat, Av San Pablo Xalpa 180, Mexico City 02200, DF, Mexico
[3] Univ Autonoma Metropolitana Iztapalapa, Area Quim Analit, Av San Rafael Atlixco 186 Col Vicentina, Mexico City 09340, DF, Mexico