title: Simultaneous spectrophotometric determination of Fe(III) and Al(III) using orthogonal signal correction-partial least squares calibration method after solidified floating organic drop microextraction.
abstract: A solidified floating organic drop microextraction (SFODME) procedure was developed for the simultaneous extraction and preconcentration of Fe(III) and Al(III) from water samples. The method was based on the formation of cationic complexes between Fe(III) and Al(III) and 3,5,7,2',4'-pentahydroxyflavone (morin) which were extracted into 1-undecanol as ion pairs with perchlorate ions. The absorbance of the extracted complexes was then measured in the wavelength range of 300-450 nm. Finally, the concentration of each metal ion was determined by the use of the orthogonal signal correction-partial least squares (OSC-PLS) calibration method. Several experimental parameters that may be affected on the extraction process such as the type and volume of extraction solvent, pH of the aqueous solution, morin and perchlorate concentration and extraction time were optimized. Under the optimum conditions, Fe(III) and Al(III) were determined in the ranges of 0.83-27.00 μg L(-1) (R(2)=0.9985) and 1.00-32.00 μg L(-1) (R(2)=0.9979) of Fe(III) and Al(III), respectively. The relative standard deviations (n=6) at 12.80 μg L(-1) of Fe(III) and 17.00 μg L(-)(1) of Al(III) were 3.2% and 3.5%, respectively. An enhancement factors of 102 and 96 were obtained for Fe(III) and Al(III) ions, respectively. The procedure was successfully applied to determination of iron and aluminum in steam and water samples of thermal power plant; and the accuracy was assessed through the recovery experiments and independent analysis by electrothermal atomic absorption spectroscopy (ETAAS).
authors.affiliation: Department of Chemistry, Faculty of Science, Vali-e-Asr University, Rafsanjan 77188-97111, Iran. Electronic address: m.rohani@vru.ac.ir.
authors.forename: Masoud
authors.initials: M
authors.lastname: Rohani Moghadam
authors.affiliation: Department of Chemistry, Faculty of Science, Yazd University, Yazd 89195-741, Iran.
authors.forename: Ali Mohammad
authors.initials: AM
authors.lastname: Haji Shabani
authors.affiliation: Department of Chemistry, Faculty of Science, Yazd University, Yazd 89195-741, Iran.
authors.forename: Shayessteh
authors.initials: S
authors.lastname: Dadfarnia
mesh_terms: D000535:Aluminum / Q000032:analysis*; D002138:Calibration; D062126:Databases, Chemical; D005419:Flavonoids / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007477:Ions; D007501:Iron / Q000032:analysis*; D016018:Least-Squares Analysis; D059627:Liquid Phase Microextraction / Q000379:methods*; D015999:Multivariate Analysis; D010472:Perchlorates / Q000737:chemistry; D011210:Power Plants; D012997:Solvents / Q000737:chemistry; D013053:Spectrophotometry / Q000379:methods*; D013997:Time Factors; D047309:Flavones
chemical_list: D000535:Aluminum; D005419:Flavonoids; D007477:Ions; D007501:Iron; D010472:Perchlorates; D012997:Solvents; C008548:morin; D047309:Flavones
keywords: Aluminum; Iron; Orthogonal signal correction–partial least squares; Simultaneous determination; Solidified floating organic drop microextraction