Abstract:
Above all, I thanks to ALMIGHTY GOD for helping, giving me this opportunity and for being with me from the beginning to the end of this work by encouraging and keeping me safe in realizing my study to the completion.
I would never have been able to finish my thesis without the guidance of my advisors, and wonderful support that I acknowledged from my family and friends. I would like to express my genuine thankfulness to my principal advisor, Dr. Belete Yilma and Co-advisor Dr. Bambuskin for their encouragement, guidance, valuable and concrete professional suggestions in every step during my thesis. I would like to acknowledge to the staffs of chemistry department in Arba Minch University.
I would like to express my deepest appreciation to my beloved wife Genet Tadele for her invaluable continuous support, carrying our babies, suggestion and encouragement in each step from early beginning up to the end of my study. It also my pleasure to thank and words are not enough to express my gratitude to whole lovely family, my mother Mama, my beloved brother Mr. Ayele Lare and Mrs. Ayelech Lare for their support, love, kindness and everything that they sacrificed in my entire life, career development, constructive suggestion and informative guidance for which I have been winning to complete my study successfully.
I am also very happy and appreciated Arba Minch University chemistry laboratory technicians specially, Mr. Ambaye Alemayehu, Mr. Enesermo Daba, Mr. Habtamu Birhanu, Mr. Fitum H/Micael, Mr. Gemechu Leta (from Biology laboratory) for their technical support, collaboration and willingness until the completion of experimental works and provide me with guide and keep me on the correct path during laboratory works.
Finally, I would like to apologize to all those I did not mention their name here and they have helped me fruitfully in various ways to undergo a successful study.
