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Rapid extraction and reverse phase-liquid chromatographic separation of mercury(II) and methylmercury in fish samples with inductively coupled plasma mass spectrometric detection applying oxygen addition into plasma. Food Chem 2015; 184:147-53. [DOI: 10.1016/j.foodchem.2015.03.067] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2014] [Revised: 01/19/2015] [Accepted: 03/19/2015] [Indexed: 11/23/2022]
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Rodriguez-Gonzalez P, Bouchet S, Monperrus M, Tessier E, Amouroux D. In situ experiments for element species-specific environmental reactivity of tin and mercury compounds using isotopic tracers and multiple linear regression. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2013; 20:1269-1280. [PMID: 22678549 DOI: 10.1007/s11356-012-1019-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2012] [Accepted: 05/28/2012] [Indexed: 06/01/2023]
Abstract
The fate of mercury (Hg) and tin (Sn) compounds in ecosystems is strongly determined by their alkylation/dealkylation pathways. However, the experimental determination of those transformations is still not straightforward and methodologies need to be refined. The purpose of this work is the development of a comprehensive and adaptable tool for an accurate experimental assessment of specific formation/degradation yields and half-lives of elemental species in different aquatic environments. The methodology combines field incubations of coastal waters and surface sediments with the addition of species-specific isotopically enriched tracers and a mathematical approach based on the deconvolution of isotopic patterns. The method has been applied to the study of the environmental reactivity of Hg and Sn compounds in coastal water and surface sediment samples collected in two different coastal ecosystems of the South French Atlantic Coast (Arcachon Bay and Adour Estuary). Both the level of isotopically enriched species and the spiking solution composition were found to alter dibutyltin and monomethylmercury degradation yields, while no significant changes were measurable for tributyltin and Hg(II). For butyltin species, the presence of light was found to be the main source of degradation and removal of these contaminants from surface coastal environments. In contrast, photomediated processes do not significantly influence either the methylation of mercury or the demethylation of methylmercury. The proposed method constitutes an advancement from the previous element-specific isotopic tracers' approaches, which allows for instance to discriminate the extent of net and oxidative Hg demethylation and to identify which debutylation step is controlling the environmental persistence of butyltin compounds.
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Affiliation(s)
- Pablo Rodriguez-Gonzalez
- Laboratoire de Chimie Analytique Bio-Inorganique et Environnement, Institut Pluridisciplinaire de Recherche sur l'Environnement et les Matériaux, UMR 5254 CNRS, Université de Pau et des Pays de l'Adour, Hélioparc, 64053, Pau, France.
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Castillo A, Gracia-Lor E, Roig-Navarro AF, Vicente Sancho J, Rodríguez-González P, García Alonso JI. Isotope pattern deconvolution-tandem mass spectrometry for the determination and confirmation of diclofenac in wastewaters. Anal Chim Acta 2012; 765:77-85. [PMID: 23410629 DOI: 10.1016/j.aca.2012.11.033] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2012] [Revised: 10/11/2012] [Accepted: 11/18/2012] [Indexed: 10/27/2022]
Abstract
Isotope dilution mass spectrometry (IDMS) based on isotope pattern deconvolution (IPD) has been applied here to MS/MS (QqQ) in order to carry out the quantification and confirmation of organic compounds in complex matrix water samples without the use of a methodological IDMS calibration graph. In this alternative approach, the isotope composition of the spiked sample is measured after fragmentation by SRM and deconvoluted into its constituting components (molar fractions of natural abundance and labeled compound) by multiple linear regression (IPD). The procedure has been evaluated for the determination of the pharmaceutical diclofenac in effluent and influent urban wastewaters and fortified surface waters by UHPLC (ESI) MS/MS using diclofenac-d(4) as labeled compound. Calculations were performed acquiring a part and the whole fragment cluster ion, achieving in all cases recoveries within 90-110% and coefficients of variation below 5% for all water samples tested. In addition, potential false negatives arising from the presence of diclofenac-d(2) impurities in the labeled compound were avoided when the proposed approach was used instead of the most usual IDMS calibration procedure. The number of SRM transitions measured was minimized to three to make possible the application of this alternative technique in routine multi-residue analysis.
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Affiliation(s)
- Angel Castillo
- Research Institute for Pesticides and Water, Universitat Jaume I, Castelló, Spain
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González-Antuña A, Rodríguez-González P, Centineo G, García Alonso JI. Evaluation of minimal 13C-labelling for stable isotope dilution in organic analysis. Analyst 2010; 135:953-64. [PMID: 20419243 DOI: 10.1039/b924432h] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A procedure for Stable Isotope Dilution Analysis in molecular Mass Spectrometry which does not require a methodological calibration graph and can be applied in combination with minimal labelling has been evaluated. This alternative approach is based on the determination of the molar fractions for each pure isotope pattern (natural abundance or labelled) contributing to the isotope pattern observed in the mixture of natural abundance and labelled molecules by multiple linear regression. Two labelled compounds, (13)C(1)-labelled or (13)C(6)-labelled phenol, were compared to study the influence of the number of (13)C atoms in the labelled molecule. The procedure was evaluated by comparing the results obtained for the determination of phenol in NIST 1584 CRM by GC-EI-MS using the classical isotope dilution calibration procedure and the new procedure based on multiple linear regression of isotope patterns without a calibration graph. The results obtained using the proposed procedure agreed well with both the certified values and those obtained using the classical Isotope Dilution Mass Spectrometry (IDMS) calibration procedures. For the evaluated procedure, a full uncertainty budget determination has been developed taking into account all uncertainty sources, including those derived from the uncertainties in the isotope patterns of the natural and labelled compounds. The measurements with the (13)C(1)-labelled phenol provided lower propagated uncertainties in comparison to the use of (13)C(6)-labelled phenol.
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Affiliation(s)
- Ana González-Antuña
- Department of Physical and Analytical Chemistry, Faculty of Chemistry, University of Oviedo, Spain
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Castillo Á, Rodríguez-González P, Centineo G, Roig-Navarro AF, Alonso JIG. Multiple Spiking Species-Specific Isotope Dilution Analysis by Molecular Mass Spectrometry: Simultaneous Determination of Inorganic Mercury and Methylmercury in Fish Tissues. Anal Chem 2010; 82:2773-83. [DOI: 10.1021/ac9027033] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ángel Castillo
- Department of Physical and Analytical Chemistry, Faculty of Chemistry, University of Oviedo, Julián Clavería 8, 33006 Oviedo, Spain, Research Institute for Pesticides and Water, Universitat Jaume I, E-12071, Castelló, Spain, and Innovative Solutions in Chemistry S.L., Edificio Científico-Tecnológico Campus de “El Cristo”, Oviedo, Spain
| | - Pablo Rodríguez-González
- Department of Physical and Analytical Chemistry, Faculty of Chemistry, University of Oviedo, Julián Clavería 8, 33006 Oviedo, Spain, Research Institute for Pesticides and Water, Universitat Jaume I, E-12071, Castelló, Spain, and Innovative Solutions in Chemistry S.L., Edificio Científico-Tecnológico Campus de “El Cristo”, Oviedo, Spain
| | - Giuseppe Centineo
- Department of Physical and Analytical Chemistry, Faculty of Chemistry, University of Oviedo, Julián Clavería 8, 33006 Oviedo, Spain, Research Institute for Pesticides and Water, Universitat Jaume I, E-12071, Castelló, Spain, and Innovative Solutions in Chemistry S.L., Edificio Científico-Tecnológico Campus de “El Cristo”, Oviedo, Spain
| | - Antoni Francesc Roig-Navarro
- Department of Physical and Analytical Chemistry, Faculty of Chemistry, University of Oviedo, Julián Clavería 8, 33006 Oviedo, Spain, Research Institute for Pesticides and Water, Universitat Jaume I, E-12071, Castelló, Spain, and Innovative Solutions in Chemistry S.L., Edificio Científico-Tecnológico Campus de “El Cristo”, Oviedo, Spain
| | - J. Ignacio García Alonso
- Department of Physical and Analytical Chemistry, Faculty of Chemistry, University of Oviedo, Julián Clavería 8, 33006 Oviedo, Spain, Research Institute for Pesticides and Water, Universitat Jaume I, E-12071, Castelló, Spain, and Innovative Solutions in Chemistry S.L., Edificio Científico-Tecnológico Campus de “El Cristo”, Oviedo, Spain
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