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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 29, Number 10
BKCSDE 29(10)
October 20, 2008 

Chemically Modified Submicron Silica Particulate Extractants for Preconcentration of Mercury(II)
Anupreet Kaur, Usha Gupta*
Chemically modified SiO2-nanoparticles, 1-(2-Pyridylazo)-2-naphthol, Preconcentration and separation
A new analytical method using 1-(2-pyridylazo)-2-naphthol modified SiO2 nanoparticles as solid-phase extractant has been developed for the preconcentration of trace amounts of mercury(II) in different water samples. Conditions of the analysis such as preconcentration time, effect of pH, sample volumes, shaking time, elution conditions and effects of interfering ions for the recovery of analyte were investigated. The adsorption capacity of nanometer SiO2-PAN was found to be 260 μmolg?1 at optimum pH and the detection limit (3σ) was 0.48 μgL?1. The extractant showed rapid kinetic sorption. The adsorption equilibrium of mercury(II) on nanometer SiO2-PAN was achieved just in 5 mins. Adsorbed mercury(II) was easily eluted with 5 mL of 6 M hydrochloric acid. The maximum preconcentration factor was 50. The method was applied for the determination of trace amounts of mercury(II) in various water samples and industrial effluents.
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