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Title: Effect of organic matter on determination of reactive mercury in contaminated waters
Author: Ramalhosa, E.
Segade, S. R.
Pereira, E.
Vale, C.
Duarte, A.
Keywords: Reactive Mercury
Organic Matter
Flow Injection
Cold Vapour Atomic Fluorescence Spectrometry
Natural Waters
Issue Date: 2003
Publisher: Taylor & Francis
Abstract: Dissolved reactive mercury was determined in water samples from Ria da Aveiro, a coastal lagoon contaminated by mercury. Concentrations increased with acid dilution to a maximum of 193% in samples containing organic matter with high aromaticity, as inferred from absorbances at 250, 280 and 365 nm. Laboratory experiments with potassium hydrogenoftalate and humic acids solutions proved the influence of aromaticity in complexing mercury, how acid dilution protonates the aromatic Hg-complexes and consequent release of labile forms of mercury to solution. On the basis of these results it is proposed that natural waters from mercury contaminated ecosystems should be analysed without dilutions, otherwise additional studies should be performed to access the protonation of mercury organic complexes.
Peer review: yes
DOI: 10.1080/0306731021000053757
ISSN: 0306-7319
Appears in Collections:DBio - Artigos

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