scholarly journals Rapid immobilisation of 8-hydroxyquinoline onto silica materials and its application for on-line solid-phase extraction of transition metals from environmental samples before ICP-OES monitoring

2013 ◽  
Vol 14 (1) ◽  
pp. 55-65
Keyword(s):  
Solid Phase Extraction ◽  
Environmental Samples ◽  
Solid Phase ◽  
Chelating Resin ◽  
Phase Extraction ◽  
Icp Oes ◽  
Silica Supports ◽  
The Matrix ◽  
Reactive Groups ◽  
On Line

Chelating resins based on immobilised oxines are attractive solid-phase extraction (SPE) materials in the analysis of trace metals from environmental samples. The most common immobilisation procedure for bonding oxines to silica supports is time-consuming and incompatible with “green chemistry” regulations. In this work, a rapid, environmentally friendly chemical transformation to attach oxines (i.e. 8-hydroxyquinoline) to silica surfaces is reported. The chelating resin produced by the procedure described here maintains the chemical configuration (including the spacer arm separating the reactive groups from the matrix) and is identical to that obtained with the traditional method. The resin showed satisfactory capacity exchange and excellent performance as a SPE material for on-line sample preparation (preconcentration and matrix elimination) of some transition metals before their determination by ICP-OES. The applicability of this SPE material was tested by analysing Cu, Co, Zn, Ni and Pb in the range of 50-300 ng ml-1 from a synthetic matrix simulating sediment. The recovery values ranged from 100% for Zn to 70% for Ni. The system was used with optimised parameters to analyse these ions in different sediment reference materials. The results showed good agreement with certified values.

On-line solid phase extraction using ion-pair microparticles combined with ICP-OES for the simultaneous preconcentration and determination of uranium and thorium

2016 ◽  
Vol 104 (11) ◽  
Author(s):  
Seyed Reza Yousefi ◽  
Ehsan Zolfonoun
Keyword(s):  
Solid Phase Extraction ◽  
Inductively Coupled Plasma ◽  
Solid Phase ◽  
Optical Emission ◽  
Ion Pair ◽  
Emission Spectrometry ◽  
Complexing Agent ◽  
Phase Extraction ◽  
Icp Oes ◽  
On Line

AbstractIn this work, after on-line and in-situ solid phase extraction technique was used for the extraction and preconcentration of uranium and thorium from aqueous samples prior to inductively coupled plasma optical emission spectrometry (ICP-OES) determination. In this method, sodium hexafluorophosphate (as an ion-pairing agent) was added to the sample solution containing the cationic surfactant (dodecyltrimethylammonium bromide) and the complexing agent (dibenzoylmethane). A cloudy solution was formed as a result of formation of an ion pair between surfactant and hexafluorophosphate. The solid microparticles were passed through a microcolumn filter and the adsorbed microparticles were subsequently eluted with acid, which was directly introduced into the ICP-OES nebulizer. The main variables affecting the pre-concentration and determination steps of uranium and thorium were studied and optimized. Under the optimum conditions, the enhancement factors of 97 and 95 and the detection limits of 0.52 and 0.21 μg L

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