فهرست نشریات علمی دسترسی آزاد ایران

2,6-dimercapto-4-methylphenol (DMMP) and 2,6-dimercapto-4-ethylphenol (DMEP), 2,6-dimer-capto-4-tert-buthylphenol (DMBP) as a pho‌to‌metric re‌agent for the extractive spectro‌pho‌to‌metric determination of copper(II) is offered in this paper. The component DMMP, DMEP and DMBP in the presence of hydrofobic amins resulted in an immediate and consistent blue colour with copper(II) in the pH range 5.2 to 8.5. The Beer’s law was relevant in the range of 0.3 - 20 μg/ml at 585-650 nm. The stint of detection is discovered to be 8.2-9.5 ng/mL. Compounds of several classes were proved as organic solvents. Analysis have shown that the best of those tested is chloroform. It was found that Cu(II) in the complexes was present in the form of Cu2+. Regardless of the nature of the amine during extraction, one hydrogen ion is replaced in the reagent molecule, and the ratio of copper and DP in the complex is always 1:1.The stoichiometry of the complex is determined as 1:1:1 (M: L: Am) by the method of equilibrium shift. The standard drift and the factor of variance are presented. The proposed methods is free from interferences from great number of foreign ions. The proposed methods was effectively for separation and determination of copper(II) from various pharmaceutical, food and plant samples.Thus the methods can be employed for the determination of trace amount of copper(II) in pharmaceutical, food and in plant samples are presented.