Extraction and ICP-OES determination of heavy metals using tetrabutylammonium bromide aqueous biphasic system and oleophilic collector

Svetlana V Smirnova; Dmitry V Ilin; Igor V Pletnev

doi:10.1016/j.talanta.2020.121485

Extraction and ICP-OES determination of heavy metals using tetrabutylammonium bromide aqueous biphasic system and oleophilic collector

Talanta. 2021 Jan 1:221:121485. doi: 10.1016/j.talanta.2020.121485. Epub 2020 Aug 7.

Authors

Svetlana V Smirnova¹, Dmitry V Ilin², Igor V Pletnev²

Affiliations

¹ Chemistry Department, Lomonosov Moscow State University, Leninskie Gory 1, Moscow, 119991, Russia. Electronic address: sv_v_smirnova@mail.ru.
² Chemistry Department, Lomonosov Moscow State University, Leninskie Gory 1, Moscow, 119991, Russia.

PMID: 33076095
DOI: 10.1016/j.talanta.2020.121485

Abstract

Preconcentration of Cd(II), Co(II), Cu(II), Ni(II), Pb(II), and Zn(II) in aqueous biphasic system tetrabutylammonium bromide (TBAB) - H₂O - (NH₄)₂SO₄ followed by ICP-OES determination is reported for the first time. All metal ions extracted quantitatively with 4-(2-pyridylazo)-resorcinol. Nonwoven polypropylene collector was used to capture the extract and to assist phase separation. The concentrate was eluted with 0.3 mol L^-1 nitric acid and introduced directly into ICP-OES sampling line. Detection limits for cadmium, cobalt, copper, nickel, lead, and zinc were 0.012, 0.2, 0.17, 0.11, 0.2, and 0.4 μg L^-1, respectively; preconcentration factor was 150. The method accuracy was verified by the analysis of certified reference materials samples of waste waters and surface water, as well as the real samples of spring and well water. The use of oleophilic polypropylene collector allowed to handle small volume extract, attain high preconcentration factor and significantly decrease detection limits for ICP-OES determination of heavy metals.

Keywords: Aqueous biphasic systems; Heavy metals; ICP-OES; Ionic liquids; Liquid-liquid microextraction; Nonwoven polypropylene collector.