Only analytical reagent grade reagents were utilized in the resultant study. All sample extraction and sample preparations were carried out via the use of distilled de-ionized water (18 MX cm1). The pH of the reaction mixture was maintained through the use of an ammonium chloride (NH4Cl) buffer. 21.25 g of NH4Cl (Asia Pacific Speciality Chemicals Ltd., Auburn,
NSW, Australia) and 1.0 g of disodium ethylenediaminetetraacetic acid dehydrate (EDTA) (Sigma–Aldrich, U.S.A) were dissolved and diluted to 1 L. The pH was adjusted to 8.5 using NaOH (10% w/v) solution