FI-ICP-OES determination of Pb in drinking water after pre-concentration using magnetic nanoparticles coated with ionic liquid

Accurate measurement of trace metals in environmental, biological and medical samples often requires the application of enrichment and/or isolation procedures. Among the many pre-concentration and/or matrix separation techniques available, solid phase extraction procedures (SPE) are most widely empl...

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Bibliographic Details
Published in:Microchemical journal 2019-05, Vol.146, p.339-344
Main Authors: Hosseinzadegan, Sara, Nischkauer, Winfried, Bica, Katharina, Limbeck, Andreas
Format: Article
Language:English
Subjects:
Enrichment
Flow-injection
ICP-OES
Ionic liquids
Magnetic nanoparticles
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Summary:Accurate measurement of trace metals in environmental, biological and medical samples often requires the application of enrichment and/or isolation procedures. Among the many pre-concentration and/or matrix separation techniques available, solid phase extraction procedures (SPE) are most widely employed. In the last years, surface functionalized magnetic-nanoparticles have been introduced, which offer distinct improvements compared to conventional column-based SPE approaches. In the present work, a Flow-Injection (FI) procedure for on-line separation of magnetic nanoparticles from aqueous sample solutions with subsequent ICP-OES analysis is proposed. Silica-coated magnetic cobalt nanoparticles covered with an outer layer of ionic liquid were used as sorbent material. After analyte extraction, the particle suspension was directed through an electro-magnetic trap, thereby the analyte loaded particles were separated from the sample solution. For analysis, the electro-magnet was switched off and the particles were transferred with the carrier solution to the ICP-OES used for element-specific online analysis. Compared to batch-wise methods, the FI-approach offers an additional enrichment step and requires less manual sample manipulation. Applicability of the proposed FI-ICP-OES procedure was demonstrated by the analysis of Pb in the reference material ERM-CA022a and tap-water samples collected from different districts in Vienna, Austria. •Novel Flow-Injection procedure for analysis of Pb in drinking water•Analyte pre-concentration using functionalized magnetic nanoparticles•Particle separation using electromagnetic field•On-line ICP-OES measurement of analyte containing particles
ISSN:0026-265X
1095-9149
DOI:10.1016/j.microc.2019.01.029