title: Column preconcentration and electrothermal atomic absorption spectrometric determination of rhodium in some food and standard samples.
abstract: In the present work, an electrothermal atomic absorption spectrometric method has been developed for the determination of ultra-trace amounts of rhodium after adsorption of its 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol/tetraphenylborate ion associated complex at the surface of alumina. Several factors affecting the extraction efficiency such as the pH, type of eluent, sample and eluent flow rates, sorption capacity of alumina and sample volume were investigated and optimized. The relative standard deviation for eight measurements of 0.1 ng/mL of rhodium was ±6.3%. In this method, the detection limit was 0.003 ng/mL in the original solution. The sorption capacity of alumina and the linear range for Rh(III) were evaluated as 0.8 mg/g and 0.015-0.45 ng/mL in the original solution, respectively. The proposed method was successfully applied for the extraction and determination of rhodium content in some food and standard samples with high recovery values.
authors.affiliation: Department of Chemistry, Shahid Bahonar University of Kerman, Kerman, Iran.
authors.forename: Mohammad Ali
authors.initials: MA
authors.lastname: Taher
authors.affiliation: Department of Chemistry, Shahid Bahonar University of Kerman, Kerman, Iran.
authors.forename: Fatemeh
authors.initials: F
authors.lastname: Pourmohammad
authors.affiliation: Young Researchers and Elite Club, Kerman Branch, Islamic Azad University, Kerman, Iran.
authors.forename: Hamid
authors.initials: H
authors.lastname: Fazelirad
mesh_terms: D056831:Coordination Complexes / Q000737:chemistry; D002523:Edible Grain / Q000737:chemistry; D005502:Food; D005504:Food Analysis / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D012238:Rhodium / Q000032:analysis* / Q000737:chemistry; D013054:Spectrophotometry, Atomic; D014675:Vegetables / Q000737:chemistry
chemical_list: D056831:Coordination Complexes; D012238:Rhodium
keywords: Alumina; Atomic absorption; Food samples; Rhodium; Solid-phase extraction