Pseudopolarography of trace metals. Part II. The comparison of the reversible, quasireversible and irreversible electrode reactions

Omanović, Dario; Branica, Marko

doi:10.1016/j.jelechem.2003.09.026

Cited by 22 publications

(20 citation statements)

References 29 publications

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“…The treatment of the experimental polarographic curve produced a normalized polarogram presented in the inset in Figure 5, along with the simulated [32] polarogram. A method known as a logarithmic analysis of the polarogram is suitable for testing system reversibility [25, 28 -32].…”

Section: Sampled DC Polarographymentioning

confidence: 99%

“…However, as previosly shown [32], the logarithmic analysis is unsuitable method for determining the transfer coefficient (a) for the quasireversible reactions. Therefore, a was determined by constructing a simulated polarogram.…”

Section: Sampled DC Polarographymentioning

confidence: 99%

“…Therefore, a was determined by constructing a simulated polarogram. The simulated polarogram (constructed in an ECDSOFT program) [31,32] was constructed with the following electrochemical parameters: a transfer coefficient a ¼ 0.46 AE 0.05, a rate constant k s ¼ 1.0 AE 0.3 Â 10 À3 cm s…”

Section: Sampled DC Polarographymentioning

confidence: 99%

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Voltammetry of Dissolved Iron(III)–Nitrilotriacetate–Hydroxide System in Water Solution

2005

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The investigation of the dissolved iron(III) -nitrilotriacetate -hydroxide system in the water solution (I ¼ 0.1 mol L À1 in NaClO 4 ; pH 8.0 AE 0.1) using differential pulse cathodic voltammetry, cyclic voltammetry, and sampled direct current (DC) polarography, was carried out on a static mercury drop electrode (SMDE , and À 0.154 AE 0.010 V, respectively. Although known previously in the literature, these four species have now for the first time been recorded simultaneously, i.e. proved to exist simultaneously under the given conditions.

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Section: Sampled DC Polarographymentioning

confidence: 99%

Section: Sampled DC Polarographymentioning

confidence: 99%

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Voltammetry of Dissolved Iron(III)–Nitrilotriacetate–Hydroxide System in Water Solution

2005

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“…The well-known pseudopolarographic approach in trace metal speciation [7][8][9][10][11][12][13][14][15][16][17][18][19][20] has recently attracted new attention due to the possibility to automate the process of recording of pseudopolarograms. The benefit of using pseudopolarography and a recently developed analogous technique, scanned (deposition potential) stripping chronopotentiometry (SSCP), is that obtained information about metal complexation are similar to classical polarography, but achieved at significantly lower metal concentrations [11,[22][23][24].…”

Section: Introductionmentioning

confidence: 99%

“…The benefit of using pseudopolarography and a recently developed analogous technique, scanned (deposition potential) stripping chronopotentiometry (SSCP), is that obtained information about metal complexation are similar to classical polarography, but achieved at significantly lower metal concentrations [11,[22][23][24]. As it is theoretically described and experimentally verified, the complexation of a metal by a ligand will cause a (slight) shift of reduction wave of labile complexes towards more negative potentials, while the inert complexes are separately reduced at more negative potentials comparing to labile complexes [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. The magnitude of these shifts (for both labile and inert complexes) is related to the stability constant of the formed complex and to the concentration of the free complexing ligand in the case of labile complexes.…”

Section: Introductionmentioning

confidence: 99%

Speciation of trace metals in natural waters: The influence of an adsorbed layer of natural organic matter (NOM) on voltammetric behaviour of copper

Louis

Cmuk

Omanović

et al. 2008

Analytica Chimica Acta

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The influence of an adsorbed layer of the natural organic matter (NOM) on voltammetric behaviour of copper on a mercury drop electrode in natural water samples was studied. The adsorption of NOM strongly affects the differential pulse anodic stripping voltammogram (DPASV) of copper, leading to its distortion. Phase sensitive ac voltammetry confirmed that desorption of adsorbed NOM occurs in general at accumulation potentials more negative than -1.4V. Accordingly, an application of negative potential (-1.6V) for a very short time at the end of the accumulation time (1% of total accumulation time) to remove the adsorbed NOM was introduced in the measuring procedure. Using this protocol, a well-resolved peak without interferences was obtained. It was shown that stripping chronopotentiogram of copper (SCP) in the depletive mode is influenced by the adsorbed layer in the same manner as DPASV. The influence of the adsorbed NOM on pseudopolarographic measurements of copper and on determination of copper complexing capacity (CuCC) was demonstrated. A shift of the peak potential and the change of the half-peak width on the accumulation potential (for pseudopolarography) and on copper concentration in solution (for CuCC) were observed. By applying a desorption step these effects vanished, yielding different final results.

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Iron(III)‐mediated Electrochemical Detection of Levofloxacin in Complex Biological Samples

Zhad

Lai

2017

Electroanalysis

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We report the design of an electrochemical sensor capable of detecting levofloxacin (LEVX) in complex biological samples. This detection strategy is simple, fast, and does not require sample pretreatment or electrode modification. Unlike previously developed electrochemical LEVX sensors that require direct oxidation of LEVX, the sensing mechanism is based on the complexation reactions between LEVX and iron(III), resulting in a concentration‐dependent decrease in the iron(III) reduction peak current and a shift in the peak potential. These changes are presumably attributed to the decrease in the concentration of uncomplexed Fe(III) in the solution. The concentration‐dependent change in both the current and potential can be used for quantification of LEVX in various samples, including 50 % synthetic urine and 25 % synthetic human saliva. The limit of detection was estimated to be in the range of 1.5 to 2.3 μM, concentrations that are much lower than the concentration of LEVX found in urine and saliva samples of patients administered this drug for conditions such as urinary tract infection. With further optimization, this sensing strategy could find applications in clinical pharmacokinetic studies.

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Pseudopolarography of trace metals. Part II. The comparison of the reversible, quasireversible and irreversible electrode reactions

Cited by 22 publications

References 29 publications

Voltammetry of Dissolved Iron(III)–Nitrilotriacetate–Hydroxide System in Water Solution

Voltammetry of Dissolved Iron(III)–Nitrilotriacetate–Hydroxide System in Water Solution

Speciation of trace metals in natural waters: The influence of an adsorbed layer of natural organic matter (NOM) on voltammetric behaviour of copper

Iron(III)‐mediated Electrochemical Detection of Levofloxacin in Complex Biological Samples

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