Solid phase extraction of Cd(II), Pb(II), Zn(II) and Ni(II) from food samples using multiwalled carbon nanotubes impregnated with 4-(2-thiazolylazo)resorcinol

Abstract

Multiwalled carbon nanotubes were impregnated with 4-(2-thiazolylazo)resorcinol and used for the separation and preconcentration of Cd(II), Pb(II), Zn(II) and Ni(II) ions from food samples. The analytes were quantitatively recovered at pH 7.0 and eluted with 3 mol L −1 acetic acid. The effects of pH value, flow rate, eluent type and sample volume on the recoveries, and the effects of alkali, earth alkali and transition metals on the retention of the analytes were studied. The method was validated using the standard certified reference materials SRM 1570A (spinach leaves) and IAEA 336 (lichen), and the results were found to be compatible with the certified values of reference materials. The new enrichment procedure was applied to the determination of these ions in various food samples.

Solid phase extraction of metal ions in environmental samples on 1-(2-pyridylazo)-2-naphthol impregnated activated carbon cloth

“…Preparation of the PAN-impregnated activated carbon cloth followed a procedure given in the literature (Alothman et al, 2012). A mass of 0.500 g of two pieces of ACC were added to 50 mL of a 0.5% PAN solution and incubated with continuous shaking for 6 h. Afterwards, the PAN-impregnated activated carbon cloth was collected from the solution, washed with ethanol and water and dried overnight at 80°C.…”

“…Among these, solid phase extraction is a widely accepted, ideal, and powerful technique because of its simplicity, high enrichment factor, low cost, low or no consumption of organic solvents, ease of automation and ability to be coupled with various modern detection techniques (Poole et al, 2000;Soylak, 2003;Alothman et al, 2012).…”

Determination of Trace Amounts of Cd(II), Cu(II), and Ni(II) in Food Samples Using a Novel Functionalized Magnetic Nanosorbent

“…Its prevalent applications are due to its intrinsic simplicity, fastness, minimal cost, and low consumption of reagents (Tuzen et al 2008a). Because of the emersion of SPE, various sorbents such as carbon nanotubes (Alothman et al 2012;Tuzen et al 2008b, c), magnetic nanoparticles (Asgharinezhad et al 2014a), solid sulfur (Parham et al 2009), cotton (Faraji et al 2009), and modified porous materials (Ebrahimzadeh et al 2012) have been utilized.…”

A highly selective nanocomposite based on MIP for curcumin trace levels quantification in food samples and human plasma following optimization by central composite design

“…Initial MIPs needs to be immobilized on the surface of materials such as quantum dots [33], nanocapsules [34], magnetic nanoparticles [35] and nanotubes [36] and this drawback simply resolved by their preparation in nanoscale and also simple phase separation in case of MMIPs application. Multiwalled carbon nanotubes (MWCNTs) as supporting material because of its unique mechanical properties, chemical stability, biocompatibility and large surface area [37][38][39] is good candidate to be support for MIP which improve the binding capacity and ease removal the binding molecules.…”