Affiliation: | (1) Institute of Marine and Limnology, National University of Mexico, Universitaria, D.F., Apartado Postal 70-305, C.P. 04510, Mexico, MX;(2) Department of Chemistry, Florida Institute of Technology, Melbourne, FL 32901, USA, US;(3) PEMEX, GSIPA, Cd. Del Carmen, Campeche, Mexico, MX |