Ultrasonic aided synthesis of a novel mesoporous cobalt-based metal-organic framework and its application in Cr(III) ion determination in centrum multivitamin and real water samples

Modified carbon paste ion selective electrode for determining Cr(iii) ions in aqueous solutions and some real samples using tetragonal zirconia nanoparticles

“…It would be acceptable to state that this sensor displayed increased selectivity and sensitivity for the selective detection of Cr(III) ions in comparison to the latterly described potentiometric sensors 2,50,59-64 (Table (4)). This could be explained by the exceptional characteristics of the used nano t-ZrO 2 ionophore, such as its surface area, porous structure, mechanical, and conductivity capabilities.…”

“…The average crystallite size of prepared nanoparticles is 20.2 nm (derived from the Debye-Scherrer equation). 4,45 3.2. SEM in conjunction with EDAX of t-ZrO 2…”

“…According to prior studies, 4,12 the sensitivity and selectivity of ion-selective electrodes are known to be greatly inuenced by the nature of the solvent mediator and any additives employed. Both the membrane's dielectric constant and the ionophore's mobility are inuenced by the type of plasticizer.…”

“…Compared to Cr(VI) compounds, Cr(III) is thought to be less hazardous. [2][3][4] But when taken in excess, about 1 mg daily, it is harmful. 5,6 Alternative techniques, particularly spectrophotometry, 7 isotope dilution mass spectrometry, 8 cloud point extraction and ame atomic absorption spectrometry, 9 HPLC, 10 chromatography 10 inductively coupled plasma mass spectrometry, 11 have been considered for the monitoring of Cr(III) ions.…”

“…However, electrochemical techniques, which are safe for the environment, have the benets of high sensitivity, simplicity of use, and mobility. 4,12 Ion concentrations in various substances can now be directly determined potentiometrically using ion-selective electrodes (ISEs). 4,[13][14][15][16] One of the extremely important ISE is modied carbon pastebased sensors (MCPEs) which formed from blending of pasting liquid (plasticizer), conductive graphite powder and ion carrier and offer a lot of merits include being simple to apply to colored and turbid liquids, affordable, providing satisfactory selectivity, having a minimal detection limit, possessing outstanding accuracy, and offering a wide concentration range.…”