Spectrophotometric Determination of Micro Amount of mercury (II) Using an New of (Azo) Derivative, Study of Thermodynamic Functions and Their Analytical Application

Abstract

In This study is preparation and diagnosis of new Ligand is 4,5-bis(4-methoxyphenyl)-2-(m-tolyldiazenyl)-1H-imidazole) (BMTI), one of the azo compounds. And that of the traditional method of azoth. The study also considered the use of this reagent to express spectroscopy for mercury (II) ion in the binary solution of water, where it was noted that the reagent be complicated the light red with the ion and shows the greatest absorption at λ_max= (538) nm (pH = 10). Was found to be a complex mercury duo Reagent with a stable of more than (48hours) when the pH best with compliance to Beer's law in the range of concentrations ranging between (0.2 – 9.0 µg/mL) . The effect of several factors including the value of the absorption effect of reagent concentration, reaction time, masking agent , sequences of addition and the effect of different parameters such as effect cations and anions ,and the effect of ionic strength and temperature effect . the stoichiometry of complex was investigated by ratio of the reagent - metal molar ratios, Jobs (the constant changes) mollard methods showed that the proportion of the metal regent is (1:2), with molar absorptivity (1.31x10⁴ L mol^-1 cm^-1). Limit of detection (LOD) and Limit of quantification were (0.0288 μg/mL) and (0.0952μg/mL), respectively. . As has been the preparation of complex solid was studying some of his physical characteristics such as solubility and molar conductivity and the melting point of the complex. All compound has been characterized by spectroscopic methods [HNM].[mass spctrum] [FT.IR.,UV-Vis].(UV-Vis) absorption spectra show bathochromic shift( compared with that of free reagent ) the results of the accuracy and precision of the method used to estimate the value of the element mercury percentile relative deviation (RSD%) ranged between(0.71% -1.42%) while the values of the relative error( E%) between (1.24 - 4.47 ) . The thermodynamic functions were also calculated by studying the effect of temperature. The method was applied to some environmental and industrial models, and the results were of high accuracy and precision.