1. 1,4Department of Pure and Industrial Chemistry, Faculty of Physical Sciences, Akwa Ibom State University Ikot Akpaden .Akwa Ibom State, Nigeria.
2. 2Department of Chemistry, Faculty of Science, University of Uyo, Uyo, Akwa Ibom State, Nigeria.
3. 3Department of Pure and Industrial Chemistry, Faculty of Physical Sciences, University of Nigeria,Nsukka, Enugu State, Nigeria.