Determination of mercury species using thermal desorption analysis in AAS

Coufalík, Pavel; Zvěřina, Ondřej; Komárek, Josef

doi:10.2478/s11696-013-0471-0

Cited by 30 publications

(19 citation statements)

References 17 publications

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“…Although, experimentally defined temperature of HgS thermal desorption is 365 °C (range between 250 -435 °C) 36 here, nano size HgS particles were used. It is expected that volatility of nano size HgS will differ from the commercially available bulk material.…”

Section: Hg Species Quantification By Species Specific Isotope Dilutimentioning

confidence: 99%

Hg Speciation in Petroleum Hydrocarbons with Emphasis on the Reactivity of Hg Particles

et al. 2015

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Particulate HgS is generally thought to be the most abundant Hg species in stored petroleum hydrocarbons stocked onshore. It is also assumed that due to its high stability constant, HgS is chemically inert. However, results from the current study would suggest otherwise. Firstly, a comparison study of the analytical performance of ICP-MS and CV-AFS with respect to matrix effect, showed no significant difference in the measured Hg concentrations in studied samples when CV-AFS is used in the alkali mode. Subsequently, the suitability of three quantification methods during Hg speciation was investigated. Both external calibration and standard addition methods resulted troublesome with the former showing matrix dependence and the latter being hindered by the formation of an emulsion during the derivatisation step. Results from species-specific isotope dilution (SS-ID-GC-ICP-MS), on the other hand, performed at different equilibration times, showed a random variation in the calculated Hg 2+ concentration (RSD 32%), 2 suggesting that factors independent of equilibration time cause the observed variation. Further sedimentation of Hg particulate by means of ultracentrifugation improved the precision of SS-ID-GC-ICP-MS by 10-fold. These results would suggest that Hg particles in petroleum products are reactive at low temperature during Grignard alkylation.

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Section: Hg Species Quantification By Species Specific Isotope Dilutimentioning

confidence: 99%

Hg Speciation in Petroleum Hydrocarbons with Emphasis on the Reactivity of Hg Particles

et al. 2015

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“…It is believed that the intermediate peak in our case may have represented the Small Hg peaks could also be observed in the temperature range between 200 and 470°C. Although one step decomposition was suggested by some authors, it seems more likely that HgSO 4 decomposes through several stages [11,15,20,31] (Eqs. 9 and 10).…”

Section: Hg 2 Somentioning

confidence: 99%

“…Some methods involving different approaches have been tested by Biester and Scholz [4], Shuvaeva et al [12], Lopez-Anton et al [13], Rallo et al [14], Luo et al [15], Bollen et al [16], Iwashita et al [17], Wu et al [18], Coufalik et al [19,20] etc. However, no procedure for temperature fractionation of Hg has been validated or standardized yet, and therefore its comparability is questionable due to procedural differences.…”

Section: Introductionmentioning

confidence: 99%

“…Hence the aim of this work was to investigate the performance of the pyrolysis method based on CV AAS detection, which is frequently used in various laboratories [4,[8][9][10][11][12][13][14][15][16][17][18][19][20]. A comparative method based on mass spectrometry was used to better understand the temperature stability and reaction mechanisms of different Hg compounds in solid materials.…”

Section: Introductionmentioning

confidence: 99%

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Temperature stability of mercury compounds in solid substrates

et al. 2014

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Abstract:The major aim of the newly adopted Mercury Convention is to reduce global mercury (Hg) emissions to the environment. In high temperature industrial processes, including coal combustion, Hg compounds present as impurities in solid materials are decomposed and evaporated leading to the emission of Hg to the atmosphere. The behaviour of different Hg compounds and their mixtures during heating have been the subject of numerous studies, and is the topic of the present work. Controlled heating can be used to fractionate Hg compounds in solid substrates, offering the possibility of identification and quantification of Hg compounds. In the attempt to develop a method for temperature fractionation of Hg, experiments were conducted with pure Hg compounds, and the compounds mixed with different substrates (SiO 2 and CaSO 4 • 2H 2 O), for calibration purposes. Detection was performed by two methods, namely Cold Vapour Atomic Absorption Spectrometry (CV AAS) with Zeeman background correction, and Nier-type Mass Spectrometry with a Knudsen cell (MS). Further investigation is in process.

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“…2). Different Hg detoxification studies have shown the efficient quantification of non-radioactive volatilization of mercury using CV-AAS [25,26].…”

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confidence: 99%

Cloning of merA Gene from Methylotenera Mobilis for Mercury Biotransformation

Porwal

Singh

2016

Indian J Microbiol

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Mercury (Hg) is one of the most toxic heavy metal and is extremely harmful for the environment. The permissible limit of mercury in industrial effluents is 0.001 ppm, whereas there are various sites having very high levels of mercury contamination. In the present study, 10 different mercury (Hg) resistant bacterial strains were isolated from Ulhas Estuary, Mumbai (Hg concentration of 107 ppm). All the strains were subsequently grown on higher concentration of mercuric chloride (HgCl 2 ), one of the isolate (USP5) showed significant growth at high concentration of Hg (40 ppm) and 16S rRNA gene sequencing revealed the identity of the bacterium as Methylotenera mobilis, (Accession no. KT714144). The mer operon was isolated and cloned in E.coli and checked for its ability to tolerate higher concentration of Hg. It has shown growth up to 70 ppm of Hg, also presence of merA gene indicated its ability to detoxify Hg into less toxic volatile form. The atomic absorption spectrophotometry confirmed the ability of clone to efficiently detoxify 60-90 % of the Hg (10-70 ppm) within 48-72 h. This clone can be used for effective volatilization of Hg from contaminated areas.

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Determination of mercury species using thermal desorption analysis in AAS

Cited by 30 publications

References 17 publications

Hg Speciation in Petroleum Hydrocarbons with Emphasis on the Reactivity of Hg Particles

Hg Speciation in Petroleum Hydrocarbons with Emphasis on the Reactivity of Hg Particles

Temperature stability of mercury compounds in solid substrates

Cloning of merA Gene from Methylotenera Mobilis for Mercury Biotransformation

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