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Krata AA. Assignation of inorganic mercury and methylmercury mass fractions in a soil matrix certified reference material by two analytical methodologies based on species-specific isotope dilution mass spectrometry and chromatographic separation. J Sep Sci 2022; 45:3624-3634. [PMID: 35818752 DOI: 10.1002/jssc.202200347] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Revised: 06/17/2022] [Accepted: 07/07/2022] [Indexed: 11/09/2022]
Abstract
Assignment of inorganic mercury and methyl mercury mass fractions at an ultra-trace level in soil certified reference material EnvCRM 03 with a complex matrix composition was undertaken. Inorganic mercury and methyl mercury contents by species-specific isotope dilution inductively coupled plasma MS with on-line HPLC or with classical off-line chromatography were established. Different extraction protocols: sequential extraction ((1) H2 SO4 /KBr/CuSO4 ; (2) dichloromethane; (3) Na2 S2 O3 ) or one-step extraction (diluted HCl) in solid-liquid systems were verified. Sequential extraction allowed quantification and separation of inorganic mercury and methyl mercury on HPLC column in one chromatographic run and were found to be (316 ± 10) μg kg-1 (U = 3.2%, k = 2) and (0.53 ± 0.02) μg kg-1 (U = 3.8%, k = 2), respectively. Extraction by diluted HCl and application of classical off-line chromatography led to the separation of methyl mercury from predominant inorganic mercury form and was found to be (0.54 ± 0.03) μg kg-1 (U = 5.4%, k = 2). To the best-obtained literature knowledge, there was no available soil material aimed for speciation analysis of inorganic mercury and methyl mercury so far. Both developed analytical methodologies were found to be equally sensitive and could be successfully applied for mercury species determination in samples with the complex matrix. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Agnieszka Anna Krata
- Faculty of Chemistry, University of Warsaw, 1 Pasteura St., Warsaw, 02-093, Poland.,Department of Environmental Chemistry, Faculty of Chemistry, University of Lodz, 163 Pomorska St., Łódź, 90-236, Poland
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Spanu D, Butti L, Boldrocchi G, Bettinetti R, Recchia S, Monticelli D. Selective organomercury determination by ICP-MS made easy. Anal Chim Acta 2022; 1206:339553. [DOI: 10.1016/j.aca.2022.339553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Revised: 01/19/2022] [Accepted: 01/23/2022] [Indexed: 11/01/2022]
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3
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Rosera TJ, Janssen SE, Tate MT, Lepak RF, Ogorek JM, DeWild JF, Babiarz CL, Krabbenhoft DP, Hurley JP. Isolation of methylmercury using distillation and anion-exchange chromatography for isotopic analyses in natural matrices. Anal Bioanal Chem 2019; 412:681-690. [PMID: 31834449 DOI: 10.1007/s00216-019-02277-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2019] [Revised: 10/29/2019] [Accepted: 11/11/2019] [Indexed: 10/25/2022]
Abstract
The development of mercury (Hg) stable isotope measurements has enhanced the study of Hg sources and transformations in the environment. As a result of the mixing of inorganic Hg (iHg) and methylmercury (MeHg) species within organisms of the aquatic food web, understanding species-specific Hg stable isotopic compositions is of significant importance. The lack of MeHg isotope measurements is due to the analytical difficulty in the separation of the MeHg from the total Hg pool, with only a few methods having been tested over the past decade with varying degrees of success, and only a handful of environmentally relevant measurements. Here, we present a novel anion-exchange resin separation method using AG 1-X4 that further isolates MeHg from the sample matrix, following a distillation pretreatment, in order to obtain ambient MeHg stable isotopic compositions. This method avoids the use of organic reagents, does not require complex instrumentation, and is applicable across matrices. Separation tests across sediment, water, and biotic matrices showed acceptable recoveries (98 ± 5%, n = 54) and reproducible δ202Hg isotope results (2 SDs ≤ 0.15‰) down to 5 ng of MeHg. The measured MeHg pools in natural matrices, such as plankton and sediments, showed large deviations from the non-speciated total Hg measurement, indicating that there is an important isotopic shift during methylation that is not recorded by typical measurements, but is vital in order to assess sources of Hg during bioaccumulation. Graphical abstract.
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Affiliation(s)
- Tylor J Rosera
- Environmental Chemistry and Technology Program, University of Wisconsin-Madison, Madison, WI, 53706, USA.,Upper Midwest Water Science Center, U.S. Geological Survey, 8505 Research Way, Middleton, WI, 53562, USA
| | - Sarah E Janssen
- Upper Midwest Water Science Center, U.S. Geological Survey, 8505 Research Way, Middleton, WI, 53562, USA.
| | - Michael T Tate
- Upper Midwest Water Science Center, U.S. Geological Survey, 8505 Research Way, Middleton, WI, 53562, USA
| | - Ryan F Lepak
- Environmental Chemistry and Technology Program, University of Wisconsin-Madison, Madison, WI, 53706, USA
| | - Jacob M Ogorek
- Upper Midwest Water Science Center, U.S. Geological Survey, 8505 Research Way, Middleton, WI, 53562, USA
| | - John F DeWild
- Upper Midwest Water Science Center, U.S. Geological Survey, 8505 Research Way, Middleton, WI, 53562, USA
| | - Christopher L Babiarz
- Upper Midwest Water Science Center, U.S. Geological Survey, 8505 Research Way, Middleton, WI, 53562, USA
| | - David P Krabbenhoft
- Upper Midwest Water Science Center, U.S. Geological Survey, 8505 Research Way, Middleton, WI, 53562, USA
| | - James P Hurley
- Environmental Chemistry and Technology Program, University of Wisconsin-Madison, Madison, WI, 53706, USA.,Department of Civil and Environmental Engineering, University of Wisconsin-Madison, Madison, WI, 53706, USA.,University of Wisconsin Aquatic Sciences Center, Madison, WI, 53706, USA
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Ma R, Cao F, Liu B, Hu H, Gan W. Synthesis of divinylbenzene polymer/Fe 3 O 4 hybrid monolithic column for enrichment and online thermal desorption of methylmercury in real samples. Talanta 2015; 138:138-143. [DOI: 10.1016/j.talanta.2015.02.017] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2014] [Revised: 02/08/2015] [Accepted: 02/11/2015] [Indexed: 11/26/2022]
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Lemos VA, dos Santos LO. A new method for preconcentration and determination of mercury in fish, shellfish and saliva by cold vapour atomic absorption spectrometry. Food Chem 2014; 149:203-7. [DOI: 10.1016/j.foodchem.2013.10.109] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2013] [Revised: 10/18/2013] [Accepted: 10/24/2013] [Indexed: 10/26/2022]
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Yordanova T, Dakova I, Balashev K, Karadjova I. Polymeric ion-imprinted nanoparticles for mercury speciation in surface waters. Microchem J 2014. [DOI: 10.1016/j.microc.2013.11.008] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Yordanova T, Vasileva P, Karadjova I, Nihtianova D. Submicron silica spheres decorated with silver nanoparticles as a new effective sorbent for inorganic mercury in surface waters. Analyst 2014; 139:1532-40. [DOI: 10.1039/c3an01279d] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Leopold K, Foulkes M, Worsfold P. Methods for the determination and speciation of mercury in natural waters--a review. Anal Chim Acta 2010; 663:127-38. [PMID: 20206001 DOI: 10.1016/j.aca.2010.01.048] [Citation(s) in RCA: 292] [Impact Index Per Article: 20.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2009] [Revised: 01/18/2010] [Accepted: 01/20/2010] [Indexed: 10/19/2022]
Abstract
This review summarises current knowledge on Hg species and their distribution in the hydrosphere and gives typical concentration ranges in open ocean, coastal and estuarine waters, as well as in rivers, lakes, rain and ground waters. The importance of reliable methods for the determination of Hg species in natural waters and the analytical challenges associated with them are discussed. Approaches for sample collection and storage, pre-concentration, separation, and detection are critically compared. The review covers well established methods for total mercury determination and identifies new approaches that offer advantages such as ease of use and reduced risk of contamination. Pre-concentration and separation techniques for Hg speciation are divided into chromatographic and non-chromatographic methods. Derivatisation methods and the coupling of pre-concentration and/or separation methods to suitable detection techniques are also discussed. Techniques for sample pre-treatment, pre-concentration, separation, and quantification of Hg species, together with examples of total Hg determination and Hg speciation analysis in different natural (non-spiked) waters are summarised in tables, with a focus on applications from the last decade.
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Affiliation(s)
- Kerstin Leopold
- Analytical Chemistry Group, Department of Chemistry, Technical University of Munich, Lichtenbergstr. 4, 85748 Garching, Germany.
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Determination of methylmercury and inorganic mercury by coupling short-column ion chromatographic separation, on-line photocatalyst-assisted vapor generation, and inductively coupled plasma mass spectrometry. J Chromatogr A 2009; 1216:8933-8. [DOI: 10.1016/j.chroma.2009.10.061] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2009] [Revised: 10/19/2009] [Accepted: 10/23/2009] [Indexed: 11/22/2022]
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Serra A, Estela J, Cerdà V. An MSFIA system for mercury speciation based on an anion-exchange membrane. Talanta 2009; 78:790-4. [DOI: 10.1016/j.talanta.2008.12.048] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2008] [Revised: 12/16/2008] [Accepted: 12/18/2008] [Indexed: 11/29/2022]
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Preconcentration techniques for the determination of mercury species in natural waters. Trends Analyt Chem 2009. [DOI: 10.1016/j.trac.2009.02.004] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Leopold K, Foulkes M, Worsfold PJ. Gold-Coated Silica as a Preconcentration Phase for the Determination of Total Dissolved Mercury in Natural Waters Using Atomic Fluorescence Spectrometry. Anal Chem 2009; 81:3421-8. [PMID: 19334705 DOI: 10.1021/ac802685s] [Citation(s) in RCA: 104] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kerstin Leopold
- Biogeochemistry and Environmental Analytical Chemistry Group, School of Earth, Ocean and Environmental Sciences, University of Plymouth, Portland Square, Plymouth PL4 8AA, United Kingdom
| | - Michael Foulkes
- Biogeochemistry and Environmental Analytical Chemistry Group, School of Earth, Ocean and Environmental Sciences, University of Plymouth, Portland Square, Plymouth PL4 8AA, United Kingdom
| | - Paul J. Worsfold
- Biogeochemistry and Environmental Analytical Chemistry Group, School of Earth, Ocean and Environmental Sciences, University of Plymouth, Portland Square, Plymouth PL4 8AA, United Kingdom
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Percy AJ, Korbas M, George GN, Gailer J. Reversed-phase high-performance liquid chromatographic separation of inorganic mercury and methylmercury driven by their different coordination chemistry towards thiols. J Chromatogr A 2007; 1156:331-9. [PMID: 17222858 DOI: 10.1016/j.chroma.2006.12.061] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2006] [Revised: 12/02/2006] [Accepted: 12/18/2006] [Indexed: 11/17/2022]
Abstract
Since mercuric mercury (Hg(2+)) and methylmercury (CH(3)Hg(+)) display different toxicological properties in mammals, methods for their quantification in dietary items must be available. Employing Hg-specific detection, we have developed a rapid, isocratic, and affordable RP-HPLC separation of these mercurials using thiol-containing mobile phases. Optimal separation was achieved with a 50mM phosphate-buffer containing 10mM L-cysteine at pH 7.5. The separation is driven by the on-column formation of complexes between each mercurial and L-cysteine, which are then separated according to their different hydrophobicities. The developed method is compatible with inductively coupled plasma atomic emission spectrometry and was applied to analyze spiked human urine.
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Affiliation(s)
- Andrew J Percy
- Department of Chemistry, University of Calgary, Calgary, Alberta, Canada
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Delgado A, Prieto A, Zuloaga O, de Diego A, Madariaga JM. Production of artifact methylmercury during the analysis of certified reference sediments: Use of ionic exchange in the sample treatment step to minimise the problem. Anal Chim Acta 2007; 582:109-15. [PMID: 17386482 DOI: 10.1016/j.aca.2006.08.051] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2006] [Revised: 08/25/2006] [Accepted: 08/25/2006] [Indexed: 10/24/2022]
Abstract
Production of artifact methylmercury (MeHg(+)) during the analysis of two certified reference sediments, CRM-580 and IAEA-405, was investigated. Leaching of the analyte from the solid sample was achieved by ultrasound assisted acidic extraction. The aqueous leachate was either ethylated (NaBEt(4)) or phenylated (NaBPh(4)) using acetic/acetate or citric/citrate to buffer the solution. Preconcentration of the volatile compounds was carried out by extraction with an organic solvent (n-hexane) or solid phase microextraction (SPME). MeHg(+) was finally separated and detected by gas chromatography with atomic emission or mass spectrometry detection (GC-MIP-AED or GC-MS). In all the cases the concentrations obtained for MeHg(+) in the CRM-580 were significantly higher than the certified value. For the IAEA-405, however, the MeHg(+) concentration found was always statistically indistinguishable from the certified value. Experiments were also conducted with synthetic samples, such as aqueous mixtures of MeHg(+) and inorganic mercury (Hg(2+)) or silica-gel spiked with both compounds. The methylation rates found (defined as the percentage of Hg(2+) present in the sample which methylates to give artifact MeHg(+)) ranged from not observable (in certain synthetic aqueous mixtures) to 0.57% (analysis of CRM-580 under certain conditions). As the amount of Hg(2+) available in the sample seems to be the main factor controlling the magnitude of the artifact, several experiments were conducted using an ionic exchange resin (Dowex M-41) in order to minimise the concentration of this chemical in the reaction medium. First, a hydrochloric leachate of the sample was passed through a microcolumn packed with the exchanger. Second, the resin was mixed with the sample prior to extraction with HCl. In both cases, the predominant Hg(2+) species, HgCl(4)(2-), was adsorbed on the resin, whereas MeHg(+), mainly as MeHgCl, remained in solution. Following the second option, a new method to analyse MeHg(+) in conflictive matrices like certain sediments was proposed. This approach produced better results for the CRM-580, but a MeHg(+) concentration slightly, but statistically significant, higher than the reference value was still obtained.
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Affiliation(s)
- Alejandra Delgado
- Kimika Analitikoa Saila, Euskal Herriko Unibertsitatea, 644 P.K., E-48080 Bilbao, Spain
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Navarro P, Raposo J, Arana G, Etxebarria N. Optimisation of microwave assisted digestion of sediments and determination of Sn and Hg. Anal Chim Acta 2006. [DOI: 10.1016/j.aca.2006.02.056] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Métivier R, Leray I, Lebeau B, Valeur B. A mesoporous silica functionalized by a covalently bound calixarene-based fluoroionophore for selective optical sensing of mercury(ii) in water. ACTA ACUST UNITED AC 2005. [DOI: 10.1039/b501897h] [Citation(s) in RCA: 181] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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