Kinetic Analysis of Cobalt in Veterinary Products

Khan, M. Nasiruddin; Bhutto, Sadaf

doi:10.1002/jccs.200500010

Jnl Chinese Chemical Soc

2005

DOI: 10.1002/jccs.200500010

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Kinetic Analysis of Cobalt in Veterinary Products

M. Nasiruddin Khan

Sadaf Bhutto

Abstract: A novel kinetic method for the determination of trace amounts of Co(II) has been developed. The proposed method based on the catalytic effect of Co(II) on the oxidation of xylenol orange tetra sodium salt by H2O2 in the presence of cationic surfactant (N-dodecylpyridinium chloride). Co(II) at mg.mL -1 was determined spectrophotometrically by measuring the decrease in the absorbance of xylenol orange at 577 nm by the differential method. The method is precise, selective, and sensitive. The detection limit of th… Show more

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2007

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Cited by 2 publications

References 12 publications

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Electrode Kinetics and Complex Formation of [Zn‐Antibiotics‐Cephalothin] System vis a vis Kinetics of Electrode Reactions

Khan

2007

J Chinese Chemical Soc

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Charge transfer reactions between a dropping mercury electrode and a [Mn-antibiotics-cephalothin] system were studied at pH = 7.30 ± 0.01, m = 1.0 M NaClO 4 at 298 K. The antibiotics were doxycycline, chlortetracycline, oxytetracycline, tetracycline, minocycline, amoxicillin and chloramphenicol used as primary ligands and cephalothin as secondary ligand formed 1:1:1, 1:1:2 and 1:2:1 complexes with Zn 2 . Electrode kinetics was discussed on the basis of kinetic parameters viz. transfer coefficient (a), degree of irreversibility (l), diffusion coefficient (D) and rate constant (k). The values of a varied from 0.40 to 0.57 (0.50) confirm that 'transition state' behaves between reactant and product response to applied potential and it lies always between d.m.e. and solution interface. A small variation in potential affects the rate and rate constant greatly.

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Electrode Kinetics and Complex Formation of [Zn‐Antibiotics‐Cephalothin] System vis a vis Kinetics of Electrode Reactions

Khan

2007

J Chinese Chemical Soc

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Surfactant‐Mediated Catalytic Determination of Fe(II) in Herbal and Pharmaceutical Products

Khan

Siddiqui

Uddin

2007

J Surfact & Detergents

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In the present work, the catalyzed oxidation of neutral red (NR) by bromate was used to work out a kinetic-based analytical method as an alternative technique for the determination of Fe(II) in real and synthetic samples. A use of a surfactant, N-dodecylpyridinium chloride enhanced the sensitivity of the reaction by becoming involved in the reaction mechanism and providing a more suitable reaction environment. The iron-catalyzed oxidation of NR with potassium bromate was studied kinetically by using a fixed time method. The reaction was followed by measuring the decrease in absorbance at 535 nm. The use of a surfactant in the analytical run showed a five times increase in the sensitivity of the method. It served as a ready reservoir of NR by increasing its solubilization. The salt effect, pH, and reagent concentration were also investigated to achieve a more selective and sensitive analytical procedure. Under optimized conditions (4.2 · 10 -5 mol L -1 NR, 1.4 · 10 -3 mol L -1 KBrO 3 , 1.5 · 10 -2 mol L -1 cationic surfactant, 0.5 mol L -1 LiCl and pH 2.60 at 30°C), iron(II) was determined in the range 0.1-0.5 lg mL -1 with a detection limit of 0.019 lg mL -1 and a relative standard deviation (n = 6) 1.02% for 0.2 lg mL -1 Fe(II). The influence of foreign ions on the accuracy of the results was investigated. The developed method is extremely sensitive, selective and simple. The method was applied successfully to the determination of iron in the herbal pharmaceutical and synthetic samples. The results showed good agreement with those obtained by atomic absorption spectrophotometry.

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Kinetic Analysis of Cobalt in Veterinary Products

Cited by 2 publications

References 12 publications

Electrode Kinetics and Complex Formation of [Zn‐Antibiotics‐Cephalothin] System vis a vis Kinetics of Electrode Reactions

Electrode Kinetics and Complex Formation of [Zn‐Antibiotics‐Cephalothin] System vis a vis Kinetics of Electrode Reactions

Surfactant‐Mediated Catalytic Determination of Fe(II) in Herbal and Pharmaceutical Products

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