Abstract
The present paper describes two new, simple, rapid, selective and sensitive kinetic spectrophotometric methods for Co(II) and Sn(II) determination in solution at room temperature, based on their effect on phenyl fluorone (PF) oxidation by hydrogen peroxide in ammonia buffer. The new method was elaborated for nano amounts of Co(II) determination, based on its catalytic effect on the oxidation of PF by H2O2 in the presence of citric acid (CA) as an activator. Also, the new method for micro amounts of Sn(II) determination was developed based on its inhibitory effect upon the same reaction. Comparison of the results showed that the activated catalytic reaction has better sensitivity than the inhibitory one. Methods were validated by the analyze of chemical substances and results were improved by examining the same samples by AAS method.
Highlights
The present paper describes two new, simple, rapid, selective and sensitive kinetic spectrophotometric methods for Co(II) and Sn(II) determination in solution at room temperature, based on their effect on phenyl fluorone (PF) oxidation by hydrogen peroxide in ammonia buffer
All spectrophotometric measurements were performed at the wavelength of absorption maximum of phenyl fluorone in ammonia buffer (493.6 nm, Figure 1)
According to the our preliminary investigations, the kinetic catalytic reaction of Co(II) is faster in the the presence of citric acid, so citric acid was added in the reaction mixture as an activator, during cobalt method investigations
Summary
The present paper describes two new, simple, rapid, selective and sensitive kinetic spectrophotometric methods for Co(II) and Sn(II) determination in solution at room temperature, based on their effect on phenyl fluorone (PF) oxidation by hydrogen peroxide in ammonia buffer. Some kinetic as well as spectrophotometric methods were published for simultaneous determination of cobalt, nickel, copper, zinc and iron in natural waters and laboratory mixtures, without prior separation [3,4,5,6,7,8,9,10,11]. Tin was determined in powdered coffee and milk [31], fruit juices [32], biological materials (kidney, liver hearth and muscles) [33], human hair [34], sea water [35], marine sediments [36], river sediments, soils and sludges [37], fly ashes, industrial effluents and alloys [38], etc
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