Journal
TALANTA
Volume 55, Issue 6, Pages 1141-1150Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0039-9140(01)00546-X
Keywords
mercury speciation; pre-concentration; cold vapor atomic fluorescence spectrometry; 2-mercaptobenzimidazol impregnated silica gel
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A new, simple and sensitive method for the simultaneous determination of mercury(II) and methylmercury chloride at sub-ng l(-1) levels in river waters is described. Inorganic and organic mercury were preconcentrated from fresh water samples simultaneously on a laboratory-made column containing 2-mercaptobenzimidazol loaded on silica gel and then quantitatively eluted with 0.05 M KCN solution and 2.0 M HCl to desorp inorganic and methylmercury species, respectively. After irradiation with an intensive UV source, MeHg+ was decomposed and mercury vapours were generated from inorganic and organic mercury using an acidic SnCl2 solution in a continuous flow system and were subsequently determined with a cold vapour atomic fluorescence (CV-AFS) spectrometer. Detection limits (3 sigma) were 0.07 and 0.05 ng l(-1) (as Hg) for mercury(II) chloride and methylmercury chloride, respectively. Relative standard deviations of method (%R.S.D.) were 8.8 and 10 for inorganic and organomercuric species in the river water, respectively. The analysis of real samples, taken from different rivers, showed that inorganic mercury levels ranged from 4.0 +/- 0.6 to 12 +/- 1 ng l(-1) (as Hg and 95% confidence limit) and methylmercury levels at 0.2 +/- 0.02 ng l(-1)(as Hg). (C) 2001 Elsevier Science B.V. All rights reserved.
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