Abstract
A multielement preconcentration procedure based Fe3O4 magnetic nanoparticles coated with polythiophene(Fe3O4@PTh MNPs) as a solid phase was reported for Cu(II), Co(II), Cd(II), Ni(II) and Zn(II) ions. Following the preconcentration, the ions were determined by microsample injection system-flame atomic absorption spectrometer (MIS-FAAS). The effect of sample pH, type and volume of eluent, sample volume, extraction time, amount of adsorbent and interfering ions were optimized. The analytes were preconcentrated from 75 to 150 mL of sample solutions buffered to pH 7. The eluent was 1 mL of 1 mol L-1 HNO3 solution. Under optimum conditions, the limits of detection for the analyte ions varied from 1 to 10 ?g L-1. The adsorption capacities of Fe3O4@PTh was in the range of 2.85 to 9.76 mg g-1. The method was validated by analysis of the certified reference materials. The relative errors and standard deviations were lower than 5%. The developed procedure was applied to various water, soil and some vegetable samples.
Highlights
Large quantities of wastes containing toxic substances are discharged from various industrial plants into environment
A Perkin Elmer model AAnalyst 700 (Norwalk, CT, USA) flame atomic absorption spectrometer equipped with hollow cathode lamp, an air-acetylene burner and a handmade microsample injection system (MIS) were used for the determination of metal ions
Around pH 7, because of decreasing protonation of the sulfur atoms and increasing formation of ammine complex of metal ions at pHs in the range of 6.5 and 7.5 that phosphate buffers were used, it can be concluded that more favorable conditions arise for interaction of analyte ions with the sulfur atoms at binding site of Fe3O4@PTh MNPs
Summary
Large quantities of wastes containing toxic substances are discharged from various industrial plants into environment. In the disc and batch techiques, the solid phase in which the analytes are collected is contaminated with insoluble matters and proper separation does not occur These limitations can be overcome by processes such as filtration and precipitation prior to preconcentration procedure, but the duration of the analysis is extended further. We prepared Fe3O4 magnetic nanoparticles coated with polythiophene (Fe3O4@PTh MNPs) as a magnetic solid phase for simultaneous preconcentration/separation of Cu(II), Co (II), Cd(II), Ni(II) and Zn(II) ions from various real samples such as some water, soil and vegetable samples prior to their determinations by MIS-FAAS. The method was validated with analysis of sample spiking analyte and the certified reference materials (CRMs) corresponding to the samples
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