Preconcentration and speciation of Cr(III) and Cr(VI) in water and soil samples by spectrometric detection via use of nanosized alumina-coated magnetite solid phase

被引:0
作者
Hossein Tavallali
Gohar Deilamy-Rad
Pegah Peykarimah
机构
[1] Payame Noor University,Department of Chemistry
来源
Environmental Monitoring and Assessment | 2013年 / 185卷
关键词
Alumina-coated magnetite nanoparticles; Chromium; Speciation; Water; Soil; Flame atomic absorption spectrometry;
D O I
暂无
中图分类号
学科分类号
摘要
A novel nanomaterial has been developed for speciation of Cr(III) and Cr(VI) in water and soil samples. In this study, a new type of alumina-coated magnetite nanoparticles (Fe3O4/Al2O3 NPs) modified by the surfactant Triton X-114 has been successfully synthesized and used in magnetic mixed hemimicelles solid-phase extraction procedure. The procedure was based on the reaction of chromium(III) with 1-(2-pyridilazo)-2-naphtol as a ligand, yielding a complex, which was entrapped “in situ” in the surfactant hemimicelles. The concentration of chromium(III) was determined using flame atomic absorption spectrometry. After reduction of Cr(VI) to Cr(III) by ascorbic acid, the system was applied to the total chromium. Cr(VI) was then calculated as the difference between the total Cr and the Cr(III) content. This method can also be used for complicated matrices such as soil samples without any special pretreatment. Under the optimum conditions of parameters, the recoveries of Cr(III) by analyzing the spiked water and soil samples were between 98.6 and 100.8 % and between 96.5 and 100.7 %, respectively. Detection limits of Cr(III) were between 1.4 and 3.6 ng mL−1 for water samples and 5.6 ng mg−1 for soil samples.
引用
收藏
页码:7723 / 7738
页数:15
相关论文
共 165 条
[1]  
Ahmadi SH(2007)On-line preconcentration and speciation of chromium by an 8-hydroxyquinoline microcolumn immobilized on surfactant-coated alumina and flow injection atomic absorption spectrometry Turkish Journal of Chemistry 31 191-199
[2]  
Haji Shabani AM(2007)Speciation of hexavalent chromium in waters by liquid–liquid extraction and GFAAS determination Microchemical Journal 85 103-108
[3]  
Dadfarnia S(2005)Physical investigations of a ferrofluid based on hydrocarbons Journal of Magnetism and Magnetic Materials 289 81-83
[4]  
Taei M(1998)Spectrophotometric study of the solubility and the protolytic properties of 1-(2-pyridylazo)-2-naphthol in different ethanol–water solutions Analytica Chimica Acta 360 153-159
[5]  
Beni A(2011)Tea-industry waste activated carbon, as a novel adsorbent, for separation, preconcentration and speciation of chromium Analytica Chimica Acta 688 75-83
[6]  
Karosi R(2009)The study of novel Fe3O4@γ-Fe2O3 core/shell nanomaterials with improved properties Journal of Magnetism and Magnetic Materials 321 1052-1057
[7]  
Posta J(2006)Chromium determination and speciation since 2000 Trends in Analytical Chemistry 25 1006-1015
[8]  
Creanga D(2009)Cr(III)/Cr(VI) speciation determination of chromium in water samples by luminescence quenching of quercetin Journal of Hazardous Material 165 1062-1067
[9]  
Calugaru G(2010)Kinetics, equilibrium and thermodynamic study of Cr(VI) sorption into toluidine blue o-impregnated XAD-7 resin beads and its application for the treatment of wastewaters containing Cr(VI) Chemical Engneering Journal 160 190-198
[10]  
Dlc. Coo L(2009)Hexavalent chromium extraction from soils: a comparison of five methods Environmental Science & Technology 29 2377-2381