Combination of cloud point extraction and flame atomic absorption spectrometry for preconcentration and determination of trace iron in environmental and biological samples

Abstract

Abstract:In the presented work, the conditions for cloud point extraction of iron from aqueous solutions using 7-iodo-8-hydroxyquinolin-5-sulphonic acid (Ferron) was investigated and optimized. The procedure is based on the separation of its ferron complex into the micellar media by adding the surfactant Triton X-114. After phase separation, the surfactant-rich phase was dissolved with 1.0 M HNO 3 in methanol. Iron was determined by flame atomic absorption spectrometry. Optimization of the pH, ligand and surfactant quantities, incubation time, temperature, viscosity, sample volume, and interfering ions were investigated. The effects of the matrix ions were also examined. The detection limits for three times the standard deviations of the blank for iron was 0.4 ng m L -1, enrichment factor of 19.6 and preconcentration factor of 30 could be achieved. The validity of cloud point extraction was checked by employing real samples including soil, blood, spinach, milk, meat, liver and orange juice samples using the standard addition method, which gave satisfactory results. © Versita Warsaw and Springer-Verlag Berlin Heidelberg. Keywords: 7-iodo-8-hydroxyquinolin-5-sulphonic acid (Ferron) • Iron • Cloud point extraction • Triton X-114 •Flame atomic absorption spectrometry Research ArticleAbbreviation TAN and Phen -tannins and other phenolic compound, PMBP -1-phenyl-3-methyl-4-benzoyl-5-pyrazolone, GF-AAS -graphite furnace atomic absorption spectrometry, FAAS -flame atomic absorption spectrometry.

Spectrophotometric Determination of Trace Amounts of Eosin B Dye after Cloud Point Extraction

“…CPE method has been successfully employed for the preconcentration of metal ions [9][10][11][12] and organic compounds such as polycyclic aromatic hydrocarbons [13][14][15] , polychlorinated compounds 16 , vitamins [17][18][19] , dyes [20][21][22] and biomaterials 23 . CPE method can be easily combined with several analytical methods such as spectral [24][25][26] , inductively coupled plasma (ICP) 27 , atomic absorption 28,29 , chromatographic 30,31 , flow injection 32 .…”

Cloud point extraction-preconcentration and flame atomic absorption spectrometric determination of low levels of zinc in water and blood serum samples

“…Thus, there is a growing tendency to use micelles in trace analysis of organic [14][15][16][17] and inorganic materials [18][19][20][21][22][23][24][25][26][27][28][29][30][31]. However, despite the critical importance of Zn 2+ monitoring in many industrial, environmental, clinical and pharmaceutical samples, only a few cases of use of CPE for the separation and preconcentration of zinc has been reported in the literature [32][33][34][35].…”

Application of cloud point preconcentration and flame atomic absorption spectrometry for the determination of cadmium and zinc ions in urine, blood serum and water samples

“…17 Thus, there is a growing tendency to use surfactants in trace analysis of organic [18][19][20][21] and inorganic materials. [22][23][24][25][26][27][28][29][30][31][32] However, despite the critical importance of Zn 2+ and Cd 2+ monitoring in many industrial, environmental, clinical and pharmaceutical samples, only a few cases of the use of CPE for the separation and preconcentration of Zn 2+ and Cd 2+ have been reported in the literature. [33][34][35][36] In this work, a cloud-point preconcentration procedure was introduced for determination of Zn 2+ and Cd 2+ ions, after the formation of complex with 3,3',3",3'"-tetraindolyl (terephthaloyl) dimethane (TTDM).…”