Abstract

Preparation modified SiO2 nanoparticles with diphenylcarbazone for extraction and preconcentration of trace amounts of chromium ions in food, herbal and natural water samples

The first study on the high efficiency of nanometer-sized SiO2 coated with sodium dodecyl sulfatediphenylcarbazone as a new sorbent solid phase extraction (SPE) has been reported. For SiO2 nanoparticles synthesis, two solutions were prepared: one containing TEOS and EtOH, and the other composed of ammonium hydroxide, deionized water, and EtOH. The properties of, prepared SiO2 nanoparticles were characterized by scanning electron microscope (SEM) and transmission electron microscopy (TEM). Sorbent with modified SiO2 nanoparticles was used to preconcentrate and separate Cr(III) in rael samples. Various influencing parameters on the extraction and preconcentration of trace metal, such as pH, amount of sorbent, and concentration of the chelating agent, were studied. Under the optimized operating conditions, the sorption capacities of the modified SiO2 nanoparticles for Cr were 14.0 mg.g−1. With 10.0 mL sample an enrichment factor of 20 was obtained. The detection limits of this method for Cr was 1.3 μg.L−1 and the R.S.D.s was 2.4% (n = 10). The proposed method has been applied to the determination of Cr ions at trace levels in real samples such as rice, tobacco, orange, green pepper, black tea, honey, potato, spinach, mangosteen, tomato, strawberry, carrot, apple, kiwi, mushroom, cucumber, lettuce, tab water, well water, river water and sea water with satisfactory results.


Author(s): Ali Mirabi, Atefeh Fasamanesh and Shila shirdel

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