Ohenhen O. N.
Department of Chemistry, Michael Okpara University of Agriculture, Umudike, Nigeria.
Njoku P. C.
Department of Chemistry, Alvan Ikoku Federal College of Education, Owerri, Nigeria.
Igara C. E.
Department of Science Laboratory Tech., Akanu Ibiam Federal Polytechnic, Unwana, Afikpo, Nigeria.
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