Analytical Sciences

Preconcentration of Mercury Using Duolite GT-73 in the Analysis of Water Samples by Inductively Coupled Plasma Atomic Emission Spectrometry

Pawel POHL and Bartlomiej PRUSISZ

Wroclaw University of Technology, Institute of Inorganic Chemistry and Metallurgy of Rare Elements, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland

Duolite GT-73 resin was used for the preconcentration of Hg(II) from hydrochloric acid media as well as separation of the analyte from diversity of the co-existing metal ions (Al, Ca, Cd, Co, Cr, Cu, Fe, Mg, Mn, Ni, Pb and Zn) in off-line column operation. Due to the high affinity of the resin to the transition metals, Hg was adsorbed alongside with the foreign metals investigated. A complete release of the concomitant metals from the resin without the desorption of Hg was carried out using solutions of HCl and HNO₃. A quantitative recovery of Hg was obtained by digestion of the resin using a H₂SO₄ and H₂O₂ mixture in an open-vessel system. An enrichment factor of 40 was achieved. The devised procedure was applied for the determination of Hg(II) in tap-water samples.

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