Journal of the Chilean Chemical Society
versión On-line ISSN 0717-9707
KAUR, ANUPREET y GUPTA, USHA. PRECONCENTRATION OF Cd2+ IN DIFFERENT SAMPLES BY CHEMICALLY MODIFIED SIO2-DHAQ NANOPARTICLES. J. Chil. Chem. Soc. [online]. 2011, vol.56, n.2, pp. 649-652. ISSN 0717-9707. http://dx.doi.org/10.4067/S0717-97072011000200005.
A new analytical method using 1,8-dihydroxyanthraquinone modified SiO2 nanoparticles as solid-phase extractant has been developed for the preconcentration of trace amounts of Cd2+ in different samples. Conditions of the analysis such as preconcentration factor, effect of pH, sample volume, shaking time, elution conditions and effects of interfering ions for the recovery of analyte were investigated. The adsorption capacity of nanometer SiO2-DHAQ was found to be 85.83 μmol/g at optimum pH and the detection limit (3σ) was 0.60ng/mL. The extractant showed rapid kinetic sorption. The adsorption equilibrium of Cd2+ on nanometer SiO2-DHAQ was achieved within 20 min. Adsorbed Cd2+ was easily eluted with 6mL of 1M hydrochloric acid. The maximum preconcentration factor has been found to be 66.70. The method was applied for the determination of trace amounts of Cd2+ in different samples.
Palabras llave : Chemically modified SiO-nanoparticles; 1,8-dihydroxyanthraquinone; Preconcentration; Separation.