dc.contributor.author |
Zhang, Yanlin |
|
dc.contributor.author |
Miró, Manuel |
|
dc.contributor.author |
Kolev, Spas D. |
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dc.date.accessioned |
2019-09-10T10:10:09Z |
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dc.identifier.uri |
http://hdl.handle.net/11201/149834 |
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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. |
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dc.format |
application/pdf |
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dc.relation.isformatof |
Versió postprint del document publicat a: https://doi.org/10.1016/j.talanta.2018.06.083 |
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dc.relation.ispartof |
Talanta, 2018, vol. 189, num. 1, p. 220-224 |
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dc.rights |
(c) Elsevier B.V., 2018 |
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dc.subject.classification |
54 - Química |
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dc.subject.other |
54 - Chemistry. Crystallography. Mineralogy |
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dc.title |
A novel on-line organic mercury digestion method combined with atomic fluorescence spectrometry for automatic mercury speciation |
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dc.type |
info:eu-repo/semantics/article |
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dc.type |
info:eu-repo/semantics/acceptedVersion |
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dc.date.updated |
2019-09-10T10:10:09Z |
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dc.date.embargoEndDate |
info:eu-repo/date/embargoEnd/2020-11-01 |
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dc.embargo |
2020-11-01 |
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dc.rights.accessRights |
info:eu-repo/semantics/embargoedAccess |
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dc.identifier.doi |
https://doi.org/10.1016/j.talanta.2018.06.083 |
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