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.
Analytical application of the reaction system alizarine-hydrogen peroxide in borate buffer media for the spectrophotometric kinetic determination of Ni(II)
