Determination of Some Trace Metals by FAAS after Solid-phase Extraction with Amberlite XAD-1180/TAN Chelating Resin

Abstract

A new chelating resin was synthesized by immobilizing 1-(2-thiazolylazo)-2-naphthol through the -N=N-group on Amberlite XAD-1180. The resin was used for the preconcentration of Cd(II), Co(II), Cu(II), Mn(II), Ni(II), and Pb(II) ions and their determination by flame atomic absorption spectrometry (FAAS). The influences of some analytical parameters, such as the pH, volume of the sample, flow rates of the sample and eluent, matrix components, amount of the resin, and amount and type of the eluent on the recovery, were investigated. Those metals retained on the resin at pH 8.5 were eluted with 25 mL of 2 mol L -1 HNO3. The sorption capacity of the resin was determined, except for Pb(II). The recoveries were found to be ≥95%, and the relative standard-deviation values were ≤4.3%. The detection limits were in the range of 0.1 -3.6 μg L -1. For the accuracy of the method, the analysis of a certified reference material was performed. This method was applied to environmental water samples.

Synthesis, characterization and application of a novel ion-imprinted polymer for selective solid phase extraction of copper(II) ions from high salt matrices prior to its determination by FAAS

“…The sorption capacity (n m ) of the IIP for Cu(II) was obtained by using the Langmuir's Eq. (5) as shown below [9]:…”

“…A wide range of sorbents, including chelating resin, silica gel, cellulose, activated carbon, and various biosorbents have been utilized in SPE applications [7][8][9][10]. These sorbents often lack the selectivity, although they could exhibit high sorption capacity, high surface area, and good chemical and physical stability [11,12].…”

A new coprecipitation method without carrier element for separation and preconcentration of some metal ions at trace levels in water and food samples

“…To overcome these limitations, several technologies have been widely used to pre-concentrate and separate trace metals, such as liquid-liquid extraction [5,6], cloud point extraction [7,8], solid phase extraction [9][10][11][12][13], membrane filtration [14,15] and electroanalytical [16,17] techniques.…”

Trace analysis of Pt (IV) metal ions in roadside soil and water samples by Fe3O4/graphene/polypyrrole nanocomposite as a solid-phase extraction sorbent followed by atomic absorption spectrometry

“…However, the direct determination of trace metal ions in environmental samples is difficult, because of their low concentrations and higher matrix interferences. Therefore, to measure the trace levels of metal ions in the environmental samples, the separation/pre-concentration procedure is an important requirement before instrumental analysis [4][5][6][7][8][9].…”