Adsorptive Stripping Voltammetric Determination of Nanomolar Concentration of Cerium(III) at a Carbon Paste Electrode Modified by N′‐[(2‐Hydroxyphenyl)Methylidene]‐2‐Furohydrazide

Abstract

The aim of this work was to obtain an adsorptive stripping voltammetric method for the Ce(III) determination at a carbon paste electrode, chemically modified with N-[(2-hydroxyphenyl)methylidene]-2-furohydrazide (NHMF). The electroanalytical procedure comprised two steps: the Ce(III) chemical accumulation at À 200 mV followed by the electrochemical detection of the Ce(III)/NHMF complex, using anodic stripping voltammetry. The factors, influencing the adsorptive stripping performance, were optimized including the modifier quantity in the paste, the electrolyte concentrations, the solution pH and the accumulation potential or time. The resulting electrode demonstrated a linear response over a wide range of Ce(III) concentration (5.0 -90 nmol dm À3 ). The detection limit was found to be 0.8 nmol dm À3 on the basis of a signal to noise ratio of 3. The precision for six determinations of 10 and 55 nmol dm À3Ce(III) was 5.6% and 2.1% (relative standard deviation), respectively. Application of the procedure to the determination of cerium in phosphate rock and wastewater samples gave good results.

Voltammetric and Spectroscopic Determination of Rare Earth Elements in Fresh and Surface Water Samples

“…The stripping peaks and detection limits for Ce(III) were very good, when compared with other voltammetric methods in existence. The detection limits compared well with studies obtained elsewhere [32,36,37]. Most researchers have found it difficult to produce discrete La(III) and Pr(III) analysis by voltammetric methods [38,39].…”

“…However, NO 3 interfered significantly with the REEs than PO 4 and SO 4. Separation techniques before voltammetric analysis may overcome this problem, as reported elsewhere [32]. Tables 3 and 4 show the results obtained from the voltammetry and ICP-OES techniques, respectively.…”

Voltammetric sensor based on Co3O4/SnO2 nanopowders for determination of diltiazem in tablets and biological fluids

“…Recently, we used modified CPEs for trace analysis of some drugs and heavy metals in various environments [20][21][22][23][24]. Newly we showed that the application of nanopowders of Fe 2 TiO 5 in CPEs catalyses the oxidation of salbutamol and enhances the peak current values in the differential pulse anodic stripping voltammetric (DPASV) determination of it at sub-nanomolar levels [25].…”

Cathodic Stripping Voltammetric Determination of Cerium Using Indium Tin Oxide (ITO)

“…For cerium determination, the deposition potential re-quired is too negative to be detected by ASV, as the standard reduction potential for the Ce 3 + /Ce 0 redox couple is À2.48 V. This can be a challenge for most electrode materials, including ITO, because of inadequate hydrogen overpotential resulting in significant interference from hydrogen gas bubbles reducing the effective electrode surface area. Mehran et al used AdSV on a carbon paste electrode modified with N'-[(2-hydroxyphenyl)methylidene]-2-furohydrazide (NHMF), and achieved a detection limit of 0.8 nM [32]. While this novel sensor only required a response time of ca.…”

“…Abbas et al used a novel potentiometric sensor composed of a new nano-composite carbon paste electrode fabricated from (Z)-2-((1H-1,2,4-triazol-3ylimion)methyl)phenol, as an ionophore, a multiwalled carbon nanotube (MWCNT), nanosilica, and air and water-stable ionic liquid [BMP]Tf 2 N for the quantification of cerium(III) ions and achieved a detection limit of 6.45 nM [31]. A disadvantage of AdSV is the need to use an organic ligand for complexing the analyte, the use of a mercury electrode, which is a requirement of many adsorptive stripping procedures [23], or the use of more complicated modified carbon paste electrodes like the ones already mentioned [32]. 5 s and gave good selectivity, the requirement of a combination of reagents for modification of a carbon paste electrode makes it less attractive because of the lengthy electrode preparation.…”