A novel on-line organic mercury digestion method combined with atomic fluorescence spectrometry for automatic mercury speciation

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dc.contributor.author Zhang, Yanlin
dc.contributor.author Miró, Manuel
dc.contributor.author Kolev, Spas D.
dc.date.accessioned 2019-09-10T10:10:09Z
dc.identifier.uri http://hdl.handle.net/11201/149834
dc.description.abstract A novel on-line digestion method was developed based on organic mercury (Org-Hg) oxidation at ambient temperature using potassium permanganate in the presence of sulphide. The digestion of Org-Hg was instantaneous and quantitative. Consequently, a simple mercury speciation method was developed to differentiate inorganic mercury (In-Hg) and Org-Hg in water samples with a sequential injection analytical system in conjunction with atomic fluorescence spectrometric detection by using Hg2+ as the sole standard for calibration. In-Hg was determined after acidification and decomposition of the organic matter in the sample matrix with KMnO4, while total mercury (T-Hg) was determined after online Org-Hg digestion, and Org-Hg was calculated as the difference between T-Hg and In-Hg. The operational parameters were optimized and the possible role that sulphide played in the digestion of Org-Hg was discussed. A detection limit (3σ criterion) of 3 ng L−1 Hg was achieved, which is far below the guideline value of Hg in drinking water set by WHO, viz., 1 μg L−1. The method was applied to the analysis of lake water samples for the determination of In-Hg and Org-Hg. Relative recoveries of 94-97% for In-Hg and 93.5-94.5% for T-Hg with relative standard deviations of 1.1-3.1% were obtained in real samples spiked with 100 ng L−1 Hg2+ and 100 ng L−1 Org-Hg, respectively, indicating the feasibility of the automatic method for the determination of Hg species at the low ng L−1 level.
dc.format application/pdf
dc.relation.isformatof Versió postprint del document publicat a: https://doi.org/10.1016/j.talanta.2018.06.083
dc.relation.ispartof Talanta, 2018, vol. 189, num. 1, p. 220-224
dc.rights (c) Elsevier B.V., 2018
dc.subject.classification 54 - Química
dc.subject.other 54 - Chemistry. Crystallography. Mineralogy
dc.title A novel on-line organic mercury digestion method combined with atomic fluorescence spectrometry for automatic mercury speciation
dc.type info:eu-repo/semantics/article
dc.type info:eu-repo/semantics/acceptedVersion
dc.date.updated 2019-09-10T10:10:09Z
dc.date.embargoEndDate info:eu-repo/date/embargoEnd/2020-11-01
dc.embargo 2020-11-01
dc.rights.accessRights info:eu-repo/semantics/embargoedAccess
dc.identifier.doi https://doi.org/10.1016/j.talanta.2018.06.083

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