Abstract:
0- aryl esters are known to be sensitive to fluoride ions in organic medium. Based on this
property, a kinetic method for the spetrophotometric determination of fluoride ion has been
investigated. This studies has been carried out using l-nitro-2-napthylacetate (l-N-2-NAc)
which liberates strongly coloured 1-nitro-2-napthalate anion upon reaction with fluoride
ions in dimethyl sulfoxide (DMSO). l-N-2-NAc which has absorption maximum at 300
nm and 450 nm for yellow coloured l-nitro2-napthalate ion indicated a large different
between absorption maxima.
The reaction of l-N-2-NAc with fluoride ions has been focused to kinetic study in DMSO
at 25 °C. The rate of removal of 1 -nitro-2-napthalate anion has been obtained in DMSO by
measuring enhances in absorbance with time at 450 nm. The reaction appears to follow a
pseudo-first-order kinetics using initial rate at low concentration of fluoride with excess of
1- N-2-NAc.
It has proved that the initial rate of the reaction varies with fluoride concentration. It has
facilitated to investigate the fluoride content in water sample. Several water samples were
analyzed to find out fluoride concentration of its.
