Sorption and Preconcentration of Zineb and Maneb using 1-(2-pyridylazo)- 2-naphthol Anchored on Silica Nanoscavengers

Abstract

A new analytical method in which 1-(2-pyridylazo)-2-naphthol anchored SiO2 nanoparticles have been
used as solid-phase extractant for the preconcentration of trace amounts of zineb and maneb in water
and food samples. Conditions of the analysis such as preconcentration time, effect of pH, sample
volumes, shaking time, elution conditions and effect of interfering ions for the recovery of analyte
have been optimized. The extractant showed rapid kinetic sorption. The adsorption equilibrium of
zineb and maneb on nanometer SiO2-PAN was achieved in 15 min. Adsorption capacity and detection
limit (3σ) of nanometer SiO2-PAN has been found to be 42.52 and 50.80 µmol g
-1
and 0.93 and
0.60µgL-1
for zineb and maneb respectively under optimized conditions. Adsorbed zineb and maneb
were easily eluted with 6 mL of 6 mol L-1
hydrochloric acid. The method was applied for the
determination of trace amounts of zineb and maneb in various food samples and spiked water samples.