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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. [Projekat Ministarstva nauke Republike Srbije,   br. 172051

hemijska industrija

Analytical application of the reaction system phenyl fluorone-hydrogen peroxide for the kinetic determination of cobalt and tin traces by spectrophotometry in ammonia buffer media