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Abstract
A high sensitive, accurate and simple kinetic method has been developed for determination of trace of Co(II) ions, based on its strongly catalytic effect in the reaction oxidation of disodium-6-hydroxy-5-[(4-sulfophenyl)azo]-2-naphtalenesulfonic acid (artificial color, Sunset Yellow FCF, E110 in text selected as SY) by hydrogen peroxide in borate buffer at pH of 9.5, by monitoring the rate of disappearance of SY. Reaction rate was monitored spectrophotometrically, at λmax of the SY at 478.4 nm. The optimum operating conditions regarding reagents concentration and temperature were established. The tangent method was adopted for constructing the calibration curve, which was found to be linear over the concentration range 1.18–17.67 ng ml−1 and 17.67–58.90 ng ml−1 of Co(II). The limit of detection (3σ) is 0.15 ng ml−1, and limit of quantification (10σ) is 0.5 ng ml−1. The effects of the other ions on the reaction rate were determined for an assessment of the selectivity of the method. The developed kinetic procedure was successfully applied for the determination of Co(II) in pharmaceutical and urine samples. The unique features of this procedure are that the determination can be performed at room temperature, and the analysis time is short. The newly developed method is high sensitive, simple, inexpensive and efficient for use in the analysis of a large number of samples.
This research was supported by Grant Nos. 142015 and 142079 from the Ministry of Science, Republic of Serbia. The authors are grateful for the financial support provided by the Ministry.
Notes
a Mean value ± standard deviation (%) (n = 5).
b Relative standard deviation.
c Accuracy of the developed method.
a Mean value ± standard deviation (%) (n = 5).
b Relative standard deviation.
c Samples was obtained from Hospital City Center, Leskovac, Serbia.