title: Cloud point extraction of copper, lead, cadmium, and iron using 2,6-diamino-4-phenyl-1,3,5-triazine and nonionic surfactant, and their flame atomic absorption spectrometric determination in water and canned food samples.
abstract: A cloud point extraction procedure was optimized for the separation and preconcentration of lead(II), cadmium(II), copper(II), and iron(III) ions in various water and canned food samples. The metal ions formed complexes with 2,6-diamino-4-phenyl-1,3,5-triazine that were extracted by surfactant-rich phases in the nonionic surfactant Triton X-114. The surfactant-rich phase was diluted with 1 M HNO3 in methanol prior to its analysis by flame atomic absorption spectrometry. The parameters affecting the extraction efficiency of the proposed method, such as sample pH, complexing agent concentration, surfactant concentration, temperature, and incubation time, were optimized. LOD values based on three times the SD of the blank (3Sb) were 0.38, 0.48, 1.33, and 1.85 microg/L for cadmium(II), copper(II), lead(II), and iron(III) ions, respectively. The precision (RSD) of the method was in the 1.86-3.06% range (n=7). Validation of the procedure was carried out by analysis of National Institute of Standards and Technology Standard Reference Material (NIST-SRM) 1568a Rice Flour and GBW 07605 Tea. The method was applied to water and canned food samples for determination of metal ions.
authors.affiliation: Gaziosmanpasa University, Faculty of Science and Arts, Chemistry Department, 60250 Tokat, Turkey.
authors.forename: Demirhan
authors.initials: D
authors.lastname: Citak
authors.forename: Mustafa
authors.initials: M
authors.lastname: Tuzen
mesh_terms: D002104:Cadmium / Q000032:analysis*; D002138:Calibration; D003300:Copper / Q000032:analysis*; D003902:Detergents / Q000494:pharmacology; D005504:Food Analysis / Q000379:methods*; D005506:Food Contamination / Q000032:analysis*; D057141:Food, Preserved; D006863:Hydrogen-Ion Concentration; D007477:Ions; D007501:Iron / Q000032:analysis*; D007854:Lead / Q000032:analysis*; D017830:Octoxynol; D011092:Polyethylene Glycols / Q000494:pharmacology; D012015:Reference Standards; D012016:Reference Values; D013054:Spectrophotometry, Atomic / Q000379:methods; D013501:Surface-Active Agents / Q000737:chemistry*; D013696:Temperature; D014227:Triazines / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: C575557:2,6-diamino-4-phenyl-1,3,5-triazine; D003902:Detergents; D007477:Ions; D013501:Surface-Active Agents; D014227:Triazines; D002104:Cadmium; D014867:Water; D007854:Lead; D011092:Polyethylene Glycols; D003300:Copper; D017830:Octoxynol; C010615:Nonidet P-40; D007501:Iron