title: Novel modified carbon nanotubes as a selective sorbent for preconcentration and determination of trace copper ions in fruit samples.
abstract: In this work, multiwalled carbon nanotubes were reacted with N-[3-(triet-hoxysilyl)propyl]isonicotinamide to prepare pyridine-functionalized carbon nanotubes. This novel sorbent was characterized by infrared spectroscopy, thermal and elemental analysis, and scanning electron microscopy. Functionalized carbon nanotubes were applied for the preconcentration and determination of copper ions using flame atomic absorption spectrometry. Various parameters such as sample pH, flow rate, eluent type and concentration, and its volume were optimized. Under optimal experimental conditions, the limit of detection, the relative standard deviation, and the recovery of the method were 0.65 ng/mL, 3.2% and 99.4%, respectively. After validating the method using standard reference materials, the new sorbent was applied for the extraction and determination of trace copper(II) ions in fruit samples.
authors: Department of Chemistry, Shahid Beheshti University, G.C., Tehran, Iran.
authors: Mehdi
authors: M
authors: Rezvani
authors: Homeira
authors: H
authors: Ebrahimzadeh
authors: Azam
authors: A
authors: Aliakbari
authors: Azita
authors: A
authors: Khalilzadeh
authors: Mansoure
authors: M
authors: Kasaeian
authors: Mostafa M
authors: MM
authors: Amini
mesh_terms: D000327:Adsorption; D003300:Copper / Q000032:analysis*; D005638:Fruit / Q000737:chemistry*; D007477:Ions / Q000032:analysis; D037742:Nanotubes, Carbon / Q000737:chemistry*; D010316:Particle Size; D013054:Spectrophotometry, Atomic; D013499:Surface Properties
chemical_list: D007477:Ions; D037742:Nanotubes, Carbon; D003300:Copper
keywords: Carbon nanotubes; Copper; Fruit samples; Solid-phase extraction