title: Application of mercapto ordered carbohydrate-derived porous carbons for trace detection of cadmium and copper ions in agricultural products.
abstract: In this paper, we have introduced nanoporous carbon modified with mercapto groups as a new solid-phase method for extraction of cadmium(II) and copper(II) ions. The modified nanoporous carbon sorbent was characterised by thermogravimetric analysis, differential thermal analysis, transmission electron microscopy, Fourier transform infrared spectrometry, X-ray diffraction, and nitrogen adsorption surface area (BET) measurements. Effects of pH value, flow rates, type, concentration and volume of the eluent, breakthrough volume, and effect of other ions were studied. The experimental results show that simultaneous trace cadmium(II) and copper(II) ions can be quantitatively preconcentrated at pH 6.0 with recoveries >97%. Under optimised conditions, limits of detection are 0.04 and 0.09 ng mL(-1) for the ions of cadmium and copper respectively, and the precision of the method for analysis of cadmium and copper ions (5.0 μg of each target ions, N=8) are 2.4% and 2.1%, respectively. The obtained capacities of mercapto-nanoporous carbon were found to be 145 and 95 mg g(-1) for cadmium and copper ions, respectively. The accuracy of the proposed procedure was verified by analysing standard reference material. Finally, the introduced sorbent was successfully applied for trace determination of cadmium and copper ions in food samples.
authors.affiliation: Department of Chemistry, Shahid Beheshti University, G.C., Tehran 1983963113, Iran. Electronic address: mohammadbehbahani89@yahoo.com.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Behbahani
authors.affiliation: Department of Chemistry, College of Science, Tabriz Branch, Islamic Azad University, Tabriz, Iran. Electronic address: Abolhasani@iaut.ac.ir.
authors.forename: Jafar
authors.initials: J
authors.lastname: Abolhasani
authors.affiliation: Department of Chemistry, Shahid Beheshti University, G.C., Tehran 1983963113, Iran.
authors.forename: Mostafa M
authors.initials: MM
authors.lastname: Amini
authors.affiliation: Department of Chemistry, Shahid Beheshti University, G.C., Tehran 1983963113, Iran.
authors.forename: Omid
authors.initials: O
authors.lastname: Sadeghi
authors.affiliation: Department of Occupational Health Engineering, School of Public Health, Shahroud University of Medical Sciences, Shahroud, Iran.
authors.forename: Fariborz
authors.initials: F
authors.lastname: Omidi
authors.affiliation: Department of Chemistry, Shahid Beheshti University, G.C., Tehran 1983963113, Iran.
authors.forename: Akbar
authors.initials: A
authors.lastname: Bagheri
authors.affiliation: Department of Chemistry, Shahid Beheshti University, G.C., Tehran 1983963113, Iran.
authors.forename: Mani
authors.initials: M
authors.lastname: Salarian
mesh_terms: D000327:Adsorption; D002104:Cadmium / Q000032:analysis*; D002241:Carbohydrates / Q000737:chemistry; D002244:Carbon / Q000737:chemistry*; D003300:Copper / Q000032:analysis*; D005504:Food Analysis / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D057230:Limit of Detection; D046529:Microscopy, Electron, Transmission; D016062:Porosity; D052616:Solid Phase Extraction; D013054:Spectrophotometry, Atomic; D014961:X-Ray Diffraction
chemical_list: D002241:Carbohydrates; D002104:Cadmium; D002244:Carbon; D003300:Copper
keywords: Agricultural products; Cadmium; Copper; Flame atomic absorption spectrophotometry; Nanoporous carbon material; Solid phase extraction