Effect Of Edta On Tomatoes Plants Seedlings Under Nickel Toxicity

CHAPTER ONE 1.0 INTRODUCTION  1.1     NICKEL 1.1.1  Occurrence          Nickel (Ni) is a metallic element,with atomic number 28; atomic weight 58.69. Is a metal, which belongs to group VIIIB of the periodic table. The most important oxidation state of nickel is +2, although the +3 and +4 oxidation states are also known (Tundermann et al., 2005). Nickel resembles iron, cobalt, and copper in its chemical properties. However, unlike cobalt and iron, it is normally only stable in aqueous solution in the + 2 oxidation state (Kerfoot, 2002).           Nickel is the earth's 22nd most abundant element…