دراسة طيف امتصاص معقد الموركسيد مع أيون الكوبلت الثنائي في مذيب مختلط من الماء و 2- بروبانول

Salima Al-Seddik Al-Ddarwish; Khaled M. Elsherif; Ahmed Zubi; Zainab Y. Alzalouk; Rafallah M. Atiya

doi:10.54172/mjsc.v38i2.974

Authors

Salima Al-Seddik Al-Ddarwish Departmenof Chemistry t, Faculty of Science, Misurata University, Libya
Khaled M. Elsherif Libyan Authority for Scientific Research, Tripoli, Libya https://orcid.org/0000-0002-3884-1804
Ahmed Zubi Departmenof Chemistry t, Faculty of Science, Misurata University, Libya
Zainab Y. Alzalouk Departmenof Chemistry t, Faculty of Science, Misurata University, Libya
Rafallah M. Atiya Departmenof Chemistry t, Faculty of Science, Misurata University, Libya

DOI:

https://doi.org/10.54172/mjsc.v38i2.974

Keywords:

Cobalt Ion, Murexide, VIS Absorption Spectrum, Stability Constant

Abstract

This study shows the use of a murexide indicator as a ligand for spectral estimation of Co (II). Murexide is a metallochromic indicator that has a 520nm wavelength absorption peak, and with its bond to cobalt binary ion, this peak shifts to a wavelength of 475 nm. Murexide complexes are poorly stable in aqueous solutions. The effect of using different ratios of (2-propanol: water) mixtures on the absorption spectrum of murexide as well as its complexes with the studied metal ion was investigated. The effect of some factors on the stability of the formed complex, such as time and pH, were studied at different solvent ratios and gradients in polarity of 2-propanol and water, which were: (2:8), (4:6), and (7:3). The stoichiometry, stability constant, and molar absorptivity were estimated using the continuous variations method for the murexide complex with Co (II) at the previous ratios and the results were as follows: 2:1, 1X10¹³, 7664 L.mol^-1.cm^-1, 1:1, 1X10⁶, 1938 L.mol^-1.cm^-1, 2:1, 1X10¹³, 2422 L.mol^-1.cm^-1 for the ratios (2:8), (4:6), and (7:3), respectively. The spectral method for estimating the cobalt ion was evaluated at the ratio (7:3), by estimating the sensitivity, detection limits, quantification limits, and the linear range of the Pierre-Lambert law, where the obtained results were: 0.0948 ppm^-1, 0.0831 ppm, 0.277 ppm, 0.2-4 ppm, respectively. The effect of various concentrations of some interfering ions on the accuracy of the proposed spectroscopic method was also studied, and it was found that it decreases at high concentrations of these ions.

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