CHAPTER ONE

INTRODUCTION AND LITERATURE REVIEW

1.1        Introduction

Crude oil contains mainly hydrocarbons especially alkanes, naphthenes, and aromatics (Odebunmi and Adeniyi,2004),It contains also some nitrogen, oxygen and sulphur containing compounds along with trace amounts of elements especially nickel, vanadium, titanium, iron, cadmium etc(Odebunmi and Adeniyi,2004; Olajire and Oderinde,1996). The presence of trace metals and non-metals in the crude oil and petroleum products is destructive, especially in the refining process(Oderinde, 1989).Indigenous petroleum refineries, petroleum depots and filling stations as well as environment in general require enough information on the concentration of trace and heavy metals in Nigerian petroleum products because of its detrimental effects on both equipment and environment.

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