Lead and cadmium are among the most abundant heavy metals on earth, and are particularly toxic. Excessive concentrations of these metals in food is associated with the etiology of a number of diseases, especially with cardiovascular, renal, neurological, and bone diseases [3,4]. In addition, they are also implicated in causing carcinogenesis, mutagenesis, and teratogenesis [5]. Copper, another important metal, is an essential trace element for the human body and contributes to important intracellular metabolic events [6]. A copper imbalance can result in a severe human ailment, from either an excess or deficiency of this key element [7]. A major reason to monitor levels of toxic metals in foods follows from the fact that contamination of the general environment has increased. The sources of this environmental pollution are quite varied, ranging from industrialand traffic emissions to the use of purification mud and agricultural expedients. In order to study the toxicity of heavy metals in food, a simple, sensitive and accurate detection method is required.