An automated continuous homogeneous microextraction for the determination of selenium and arsenic by hydride generation atomic fluorescence spectrometry

Andrey Shishov; Marcin Wieczorek; Paweł Kościelniak; Danuta Dudek-Adamska; Anna Telk; Leonid Moskvin; Andrey Bulatov

doi:10.1016/j.talanta.2018.01.033

An automated continuous homogeneous microextraction for the determination of selenium and arsenic by hydride generation atomic fluorescence spectrometry

Talanta. 2018 May 1:181:359-365. doi: 10.1016/j.talanta.2018.01.033. Epub 2018 Feb 3.

Authors

Andrey Shishov¹, Marcin Wieczorek², Paweł Kościelniak², Danuta Dudek-Adamska², Anna Telk², Leonid Moskvin³, Andrey Bulatov³

Affiliations

¹ Institute of Chemistry, Saint Petersburg State University, RU-198504 Saint Petersburg, Russia. Electronic address: andrey.shishov.rus@gmail.com.
² Departament of Analytical Chemistry, Faculty of Chemistry, Jagiellonian University in Kraków, ul. Gronostajowa 2, 30-387 Kraków, Poland.
³ Institute of Chemistry, Saint Petersburg State University, RU-198504 Saint Petersburg, Russia.

PMID: 29426525
DOI: 10.1016/j.talanta.2018.01.033

Abstract

An automated continuous homogeneous microextraction approach based on a flow system has been developed and coupled with a hydride generation atomic fluorescence spectrometry system (HG-AFS). The developed approach was applied for the determination of trace arsenic and selenium in environmental water and liver samples. The nonanoic acid was investigated as a switchable hydrophilicity solvent (SHS) for homogeneous microextraction of As(III) and Se(IV) complexes with pyrrolidinedithiocarbamate (PDC). The procedure involved on-line mixing ammonium PDC (aqueous phase), sodium nonanoate (aqueous phase) and acid sample solution resulting in the formation of SHS (nonanoic acid) dispersed into the acid aqueous phase. By this continuous process, analytes complexes with PDC were formed and extracted into the fine SHS droplets followed by retention into a monolithic column packed with block of porous PTFE. Finally, the retained complexes were eluted with NaOH solution and delivered to the HG-AFS system. The limits of detection, calculated from a blank test based on 3σ, were 0.01μgL^-1 for both analytes.

Keywords: Arsenic; Continuous homogeneous microextraction; Flow analysis; Hydride generation atomic fluorescence spectrometry; Selenium; Switchable hydrophilicity solvent.