Determination of Ni(II) in Alloy by Spectrophotometric Method with a new Chromogenic Reagent (IDPBS)

Abstract

A new chromogenic reagent 4-((imidazole-2-yl)diazenyl)-N-(pyrimidin-2-yl)benzenesulfonamide was synthesized by the reaction between imidazole and Sulphadiazine as azo reagent and used as new spectrophotometric method with highly sensitive to determined Nickel (II). The reagent reacts with nickel(II) in aqueous solution at pH= 7 to form dark- brown colored complex. The reagent and its complex were identified by Fourier transform infrared (FT-IR), Uv-visible,1HNMR, and 13CNMR spectroscopies and investigate the formula and charge of the prepared complex by molar ratio and molar conductivity measurements. The complex shows λmax at 486 nm with a molar absorptivity 0.3299 x 104 L.mo1-1.cm-1 and Sandell’s sensitivity 0.0177μg.cm-2.Beer’s law is obeyed in the concentration range (0.5–7.6μg.mL-1) of Ni (II) with excellent linearity depicted by correlation coefficient value of 0.9995 with a detection limit of 0.1927μg.ml-1. Recovery and relative error values of precision and accuracy of method were found to be R.S.D.% = 0.39221, Re=98.7% and Erel = -1.3% . The nature of the complex showed that (M:L) ratio was 1:2. This method was applied for the determination of Ni(II) in alloy due to Sensitive, accurate, and rapid spectrophotometric method. The results obtained were compared with the flame atomic absorption spectrometry method, and results are in conformity.