Preface

Falter, Ralf

doi:10.1016/s0045-6535(99)00176-9

Cited by 15 publications

(24 citation statements)

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“…A headspace LOD of 200 pg ml 21 for methylmercury can be achieved for the measurement of this analyte in aqueous solution. This compares favorably with other methodologies 12 (ranging from 0.05 pg ml 21 to 10 ng ml 21 ) when sample preconcentration factors are accounted for. This provides for a method detection limit of 24 ng g 21 (dry weight ®sh tissue).…”

Section: Analytical ®Gures and Meritsmentioning

confidence: 55%

“…Analyte desorption was achieved by insertion of the SPME ®ber through the septum sealed glass line of the injector, where it was exposed and withdrawn after 40 s. Data collection was arbitrarily started a few seconds prior to the insertion of the ®ber to permit establishment of a stable baseline An applied 40 s exposure time resulted in complete clean-up for samples in the ng ml 21 concentration range (higher concentrations may require longer desorption times!). The injector temperature was set to the maximum value suggested by the supplier (250 ³C) to obtain¯ash desorption.…”

Section: Desorption Proceduresmentioning

confidence: 99%

“…3 shows the effect of extraction time on the signal intensity for methylmercury based on response from the most abundant isotope, 202 Hg z . At room temperature, equilibrium is achieved after #5±7 min for a 50 ng ml 21 analyte solution when immersion liquid-phase extraction is performed. For headspace sampling, equilibration between the gaseous methylmercury fraction and the exposed ®ber is signi®cantly slower and is not achieved in the analysis time window (v80 min).…”

Section: Desorption Proceduresmentioning

confidence: 99%

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Determination of methylmercury by solid-phase microextraction inductively coupled plasma mass spectrometry: a new sample introduction method for volatile metal species

Mester

Lam

Sturgeon

et al. 2000

J. Anal. At. Spectrom.

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Access and use of this website and the material on it are subject to the Terms and Conditions set forth at Determination of methylmercury by solid-phase microextraction inductively coupled plasma mass spectrometry: a new sample introduction method for volatile metal species Mester, Z.; Lam, J.; Sturgeon, R.; Pawliszyn, J.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=fr L'accès à ce site Web et l'utilisation de son contenu sont assujettis aux conditions présentées dans le site LISEZ CES CONDITIONS ATTENTIVEMENT AVANT D'UTILISER CE SITE WEB. NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=8900155&lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=8900155&lang=fr READ THESE TERMS AND CONDITIONS CAREFULLY BEFORE USING THIS WEBSITE.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions? Contact the NRC Publications Archive team atPublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://doi.org/10.1039/b000883oJournal of Analytical Atomic Spectrometry, 15, 7, pp. 837-842, 2000 Full PaperDetermination of methylmercury by solid-phase microextraction inductively coupled plasma mass spectrometry: a new sample introduction method for volatile metal species{ Direct coupling of solid-phase microextraction (SPME) with inductively coupled plasma mass spectrometry (ICP-MS) is described for methylmercury speciation. A thermal desorption interface, consisting of a heated, glass-lined splitless-type GC injector, was placed directly at the base of the torch to minimize the length of transfer line. This arrangement provides for fast desorption and high sample introduction ef®ciency. Direct liquid immersion and headspace extraction of methylmercury was studied, including the effect of temperature and time on the extraction ef®ciency. For clean solutions, immersion sampling SPME provided good sensitivity that was linear over two orders of magnitude whereas headspace sampling showed 15% lower sensitivity, but a linear range of more than three orders of magnitude. The d...

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Section: Analytical ®Gures and Meritsmentioning

confidence: 55%

Section: Desorption Proceduresmentioning

confidence: 99%

Section: Desorption Proceduresmentioning

confidence: 99%

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Determination of methylmercury by solid-phase microextraction inductively coupled plasma mass spectrometry: a new sample introduction method for volatile metal species

Mester

Lam

Sturgeon

et al. 2000

J. Anal. At. Spectrom.

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“…5,6 However, by applying species-specific isotope dilution (SSID) in combination with inductively coupled plasma mass spectrometry (ICP-MS) [7][8][9] it is possible to detect, quantify and correct for such unwanted processes. With SSID, analyte species of interest, prepared from enriched stable isotopes, are added and equilibrated with the sample before analysis and species transformations will be reflected by the deviation of other species isotope ratios from their natural value.…”

Section: Introductionmentioning

confidence: 99%

Mercury species transformations during sample pre-treatment of biological tissues studied by HPLC-ICP-MS

Qvarnström

Frech

2002

J. Anal. At. Spectrom.

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A high-performance liquid chromatography (HPLC) system with a C 18 column and an aqueous phase eluent (0.08% ammonium acetate and 0.02% L-cysteine) was directly connected to an inductively coupled plasma mass spectrometer (ICP-MS). HPLC-ICP-MS was used to study the abiotic formation of methylmercury, CH 3 Hg 1 , from inorganic mercury, Hg 21 , as well as demethylation of CH 3 Hg 1 to Hg 21 in biological tissues during treatment with tetramethylammonium hydroxide (TMAH) followed by pH adjustment with citric or acetic acid. Enriched isotope standards from CH 3 198 Hg 1 and 201 Hg 21 were added to the samples to monitor species transformation and to apply species-specific isotope dilution (SSID) calibration. Depending on the type of sample matrix, up to 11.5% of added Hg 21 was methylated and up to 6.26% CH 3 Hg 1 was demethylated to Hg 21 . Methylation of Hg 21 probably takes place mainly during and after pH adjustment and it decreases after prolonged TMAH treatment. To minimize abiotic methylation, it is therefore recommended to proceed with pH adjustment after samples have been treated with TMAH for 24 h. There is no significant difference in the degree of methylation using citric or acetic acid.

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“…It is a well established fact that some sample digestion and preparation methods induce articial MeHg formation from inorganic mercury, 15,16 leading to an overestimation of MeHg in the sample. This was rst discovered in the late 1990s for water vapor distillation applied to sediments and soil samples, which are usually very low in MeHg with a ratio of $1 : 100 compared to inorganic Hg.…”

Section: Enriched Isotope Spiking For Determination Of Mehg Artifact mentioning

confidence: 99%

Quick and robust method for trace determination of MeHg in rice and rice products without derivatisation

Brombach

Saber

Chen³

et al. 2015

Anal. Methods

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Recent studies of methylmercury (MeHg) in rice have shown that rice grown on mercury contaminated soil contributes to the human MeHg intake similar to a fish diet. Trace levels of MeHg in biological samples are often determined via a complex multi-stage process following EPA method 1630. We developed a simple and cost effective method suited for food quality monitoring based on a simple sample preparation procedure and the subsequent analysis of the sample with online preconcentration via solid phase extraction high performance liquid chromatography cold vapor atomic fluorescence spectrometry (SPE-HPLC-CV-AFS). The reliability of this method for MeHg in rice and rice products in the low ppb range was investigated for 4 different rice product samples. At present, no CRM for MeHg in rice or rice products is available. Therefore we cross-validated our method against standard addition and speciesspecific isotope dilution gas chromatography inductively coupled plasma mass spectrometry (SSID-GC-ICPMS), which showed no significant difference versus the external calibration with SPE-HPLC-CV-AFS. Potential species interconversion during sample preparation and measurement was ruled out by using a spike of isotopically enriched inorganic mercury. The SPE-HPLC-CV-AFS developed in our work has proven to be a robust, fast, cost efficient, competitive and reliable method for MeHg speciation in rice and rice products with a limit of detection of 0.12 mg kg À1 and a reproducibility comparable to the SS-ID-GC-ICPMS method which is sufficient for the determination of MeHg in the four market rice samples.The concentrations of MeHg ranged from 1.6 to 2.7 mg kg À1 .

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Preface

Cited by 15 publications

References 0 publications

Determination of methylmercury by solid-phase microextraction inductively coupled plasma mass spectrometry: a new sample introduction method for volatile metal species

Determination of methylmercury by solid-phase microextraction inductively coupled plasma mass spectrometry: a new sample introduction method for volatile metal species

Mercury species transformations during sample pre-treatment of biological tissues studied by HPLC-ICP-MS

Quick and robust method for trace determination of MeHg in rice and rice products without derivatisation

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