XPS and AES studies of Hg(II) sorption and desorption reactions on sulphide minerals

Details XPS and AES studies of Hg(II) sorption and desorption reactions on sulphide minerals XPS and AES studies of Hg(II) sorption and desorption reactions on sulphide minerals

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54.1957h&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 54, Issue 7, pp.1957-1967

Computer Science

3

Scientific paper

The sorption and desorption of aqueous HgCl 2 on Fe 1- x S, FeS 2 , and PbS have been studied using high resolution X-ray photoelectron and Auger electron spectroscopies. Preliminary desorption studies on Fe 1- x S, using ligands of differing Hg(II) complexing strengths, indicate that more than one form of sorbed Hg is present. The most weakly sorbed Hg is desorbed by Cl - and SO 3 2- , more strongly bound Hg is removed by S 2 O 3 2- , and CN - removes all sorbed Hg. Detailed studies on PbS indicate that there are at least three Hg(II) species present. The most weakly bound, Hg 3 S 2 Cl 2 and HgCl x , are removed by S 2 O 3 2- . They form on top of a layer of HgS, which is only removed by CN - . During adsorption, Pb is leached from the surface. Only weakly bound Hg(II) is deposited on FeS 2 ; its composition could not be fully determined.

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