Kinetic Determinations and Some Kinetic Aspects of Analytical Chemistry

Mottola, Horacio A.; Pérez‐Bendito, Dolores

doi:10.1021/a1960002k

Cited by 50 publications

(22 citation statements)

References 238 publications

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“…32 The decomposition of hydrogen peroxide (H 2 O 2 ) catalyzed by transition metal ions or their complexes in homogeneous and heterogeneous systems have been extensively studied and different mechanisms have been suggested for these reactions. [33][34][35][36][37] From above description, possible mechanism can be suggested as …”

Section: Effect Of the Type And Concentration Of Buffer In Luminolmentioning

confidence: 99%

A Metal Enhanced Flow-Injection Chemiluminescence Method for the Rapid Determination of Norfloxacin in Pharmaceutical Formulations and Serum Sample

Kamruzzaman¹,

Ferdous²,

Alam³

et al. 2011

Bulletin of the Korean Chemical Society

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A simple and highly sensitive chemiluminescence method to determine norfloxacin (NFLX) has been proposed by measuring the chemiluminescence (CL) intensities using a flow injection (FI) system. The CL intensity of the luminol-H2O2 system is strongly enhanced by the addition of Cu (II) in alkaline condition. The CL intensity is substantially increased after the injection of NFLX into the luminol-H2O2-Cu (II) system. The enhancement effect is attributed to a catalytic effect of Cu (II) due to the interaction with NFLX which forms a complex with the catalyst. Under the optimal conditions, the sensitizing effect of the CL intensity is proportional to the concentration of NFLX in the range of 1.5 × 10 -9 -5.9 × 10 -7 mol L -1 (r = 0.9994) with a detection limit (3σ) of 2.98 × 10 -10 mol L -1 . The proposed method had good reproducibility with the relative standard deviation (RSD, n = 5) of 1.6% for 1 × 10 -7 mol L −1 of NFLX. The possible reaction mechanism of the CL reaction is also discussed. This method has been successfully applied for the determination of trace amount of NFLX in pharmaceutical preparations and serum samples.

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Section: Effect Of the Type And Concentration Of Buffer In Luminolmentioning

confidence: 99%

A Metal Enhanced Flow-Injection Chemiluminescence Method for the Rapid Determination of Norfloxacin in Pharmaceutical Formulations and Serum Sample

Kamruzzaman¹,

Ferdous²,

Alam³

et al. 2011

Bulletin of the Korean Chemical Society

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“…The kinetic determination of ultra trace quantities of inorganic ions have been the subject of interest of several investigators [5][6][7][8][9][10][11][12][13][14] including our group [15][16][17][18]. A complexing agent added to a metal ion-catalyzed reaction may alter the catalytic activity of the catalyst through the formation of strong complexes with metal catalysts, resulting either in ligand inhibition or rate promotion [5].…”

Section: Introductionmentioning

confidence: 99%

Kinetic determination of trace amounts of thiosulfate based on its inhibitory effect

Tiwari

Naik

Singh

et al. 2009

JICS

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The sulfur containing ligand viz., thiosulfate is found to inhibit the Ag(I) catalyzed substitution of cyanide in hexacyanoferrate(II) by phenylhydrazine. The inhibitory effect of thiosulfate is attributed due to its tendency to form complexes with Ag(I), leading to the production of inhibitor-catalyst complexes. The reactions, followed spectrophotometrically in aqueous medium at 488 nm, was possible by the increase in absorbance of the cherry-red product, [Fe(CN) 5 PhNHNH 2 ] 3-at pH 2.8 (±0.02), at 30 (±0.1) °C, and an ionic strength (μ) of 0.02 M (KNO 3 ). The linear calibration curves were obtained using the absorbance measured at different times (A t ) and thiosulfate concentrations under specified conditions. The calculated detection limit was 4.9 × 10 -7 M. The Michaelis-Menten constant (K m ) and equilibrium constants for the formation of complexes between catalyst and inhibitor (K CI ), and the catalyst and substrate (K S ) were computed from the kinetic data. A general mechanistic scheme is proposed for this reaction.

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“…17,18 Various kinetic methods based on the catalytic action of iron on the oxidation of organic compounds have been reported in several reviews [19][20][21] and original papers. 13,[22][23][24][25] Among the many sensitive techniques for iron determination, kinetic catalytic methods are worth special mention on account of their high sensitivity and simple and low-cost equipment.…”

Section: Introductionmentioning

confidence: 99%

Spectrophotometric Determination of Trace Iron by Using Its Catalytic Effect on the N-Phenylanthranilic Acid-Potassium Periodate Reaction

Stoyanova

2008

ANAL. SCI.

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The analytical features of the reaction between N-phenylanthranilic acid (PAA) and potassium periodate in acidic medium are explored with the aim of improving the catalytic kinetic determination of iron in water samples. In the presence of Fe(II, III), PAA is oxidized by potassium periodate in a formic acid medium to form a violet-colored compound. The reaction is followed spectrophotometrically by measuring the increase in the absorbance of the oxidation product at 525 nm. The variables that affected the reaction rate were investigated and the reaction conditions were established. Calibration graphs are linear in the range of concentrations 2 -500 ng mL -1 . As low as 10 -8 mol L -1 Fe(II, III) can be easily determined by the fixed time method. The established catalytic method was successfully applied to the determination of iron in tap water and in pharmaceutical samples.

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Kinetic Determinations and Some Kinetic Aspects of Analytical Chemistry

Cited by 50 publications

References 238 publications

A Metal Enhanced Flow-Injection Chemiluminescence Method for the Rapid Determination of Norfloxacin in Pharmaceutical Formulations and Serum Sample

A Metal Enhanced Flow-Injection Chemiluminescence Method for the Rapid Determination of Norfloxacin in Pharmaceutical Formulations and Serum Sample

Kinetic determination of trace amounts of thiosulfate based on its inhibitory effect

Spectrophotometric Determination of Trace Iron by Using Its Catalytic Effect on the N-Phenylanthranilic Acid-Potassium Periodate Reaction

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