Determination of inorganic and total mercury by vapor generation atomic absorption spectrometry using different temperatures of the measurement cell

Kaercher, Luiz Eduardo; Goldschmidt, Fabiane; Paniz, José Neri Gottfried; Flores, Érico M.M.; Dressler, Valderi L.

doi:10.1016/j.sab.2005.03.006

Cited by 73 publications

(42 citation statements)

References 18 publications

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“…In previous studies 28,30 it was observed the CH 3 Hg + signal was negligible at low NaBH 4 concentration but reached a maximum in presence of 0.75% (m/v) NaBH 4 . However, in those works the NaBH 4 had to be sufficient to transform the entire CH 3 Hg + to Hg 0 in order to be detected by AAS.…”

Section: Hg Org Preconcentrationmentioning

confidence: 86%

“…The solid fraction (about 30 mg) was tansferred to a 50 mL polyethylene flask to which 10 mL of 6.0 mol L -1 HCl were added. The mixture was gently shaken and then heated in microwave oven for 3 min at 60 W. 28,29 After reaching the room temperature, the volume of the mixture was completed to 50 mL with water and then centrifuged at 15,000 rpm for 15 min. Hg org and Hg inorg were measured in the supernatant.…”

Section: Mercury Speciation In Urban Landfill Leachatementioning

confidence: 99%

See 1 more Smart Citation

Mercury speciation in urban landfill leachate by cold vapor generation atomic absorption spectrometry using ion exchange and amalgamation

Flores¹,

Paniz²,

Flores³

et al. 2009

J. Braz. Chem. Soc.

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Foi desenvolvido um sistema em linha para a especiação de Hg orgânico (Hg org ) e Hg inorgânico (Hg inorg ) em chorume. Clorocomplexos produzidos a partir do Hg inorg são separados em uma coluna trocadora de ânions. O Hg retido na coluna é eluído com NaBH 4 na presença de HCl. O Hg 0 produzido é medido por espectrometria de absorção atômica com geração de vapor frio (CV AAS). O Hg org , que não fica retido na coluna, é misturado com NaBH 4 produzindo espécies voláteis de Hg, as quais são amalgamadas numa rede de Au/Pt. O Hg é removido desta coluna por aquecimento a 600 °C e medido por CV AAS. Para a especiação de Hg inorg e Hg org em chorume, as amostras são centrifugadas, filtradas e tratadas com HCl. Os limites de detecção (3 s) são 9 e 12 ng L -1 de Hg para Hg inorg e Hg org , respectivamente. A freqüência de análise é 22 h -1 .This work deals with on line speciation of organic Hg (Hg org ) and inorganic Hg (Hg inorg ) in urban landfill leachate. Chlorocomplexes of Hg inorg are produced in HCl medium and retained on an anion exchange column. The retained Hg is eluted with NaBH 4 in presence of HCl. Hg 0 is produced and then measured by cold vapor atomic absorption spectrometry (CV AAS). Hg org does not interact with the resin and is mixed with NaBH 4 at the exit of the column producing volatile species of Hg that are then amalgamated by a gauze of Au/Pt. Mercury is removed from the gauze by heating to 600 °C and subsequently measured by CV AAS. For Hg inorg and Hg org speciation in urban landfill leachate, the samples are centrifuged, filtered and treated with HCl. The detection limits (3 s) of Hg inorg and Hg org are 9 and 12 ng L -1 of Hg, respectively. The analysis frequency is 22 h -1 .Keywords: mercury speciation, landfill leachate; flow analysis, ion exchange, amalgamation, CVG AAS IntroductionIn several countries, the urban waste is usually discarded in landfills, producing toxic leachate and toxic gases. The rainwater percolation through the residues and its inherent aqueous fraction comprise the leachate, which is characterized by high concentration of organic matter, salts, suspended particles and toxic elements. 1,2 Mercury is one of the elements often present in landfill leachate and become an environmental problem. 3 Inorganic Hg (Hg inorg ), mainly as Hg 0 and Hg 2+ , is generally disposed in urban landfills, 4 where it can associate to colloidal particles, complex with organic matter and/or bind to sulfides. 5 Under anaerobic conditions a significant fraction of Hg is transformed into more toxic species. Inorganic mercury may be transformed to other toxic species in landfill, such as methyl mercury, ethyl mercury and phenyl mercury. 6 However, the concentrations of ethyl mercury and phenyl mercury are very low and usually not detected by conventional techniques. Despite the possibility of formation of many organic and inorganic compounds of Hg in the environment, methyl mercury is usually the most abundant Hg org species found in environmental samples, [7][8][9] whereas Hg 2+ is the main Hg ino...

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Section: Hg Org Preconcentrationmentioning

confidence: 86%

Section: Mercury Speciation In Urban Landfill Leachatementioning

confidence: 99%

Mercury speciation in urban landfill leachate by cold vapor generation atomic absorption spectrometry using ion exchange and amalgamation

Flores¹,

Paniz²,

Flores³

et al. 2009

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

show abstract

“…The developed method based on CVAAS at 184.9 nm was also more sensitive than other methods reported in the literature for the determination of mercury in fish, in which measurements were made at 253.7 nm. [20][21][22] The necessary equipment for developing the measurements at 184.9 nm presented in this paper was cheaper and simpler than that commercially available for mercury determination by CVAAS at 253.7 nm.…”

Section: Discussionmentioning

confidence: 99%

“…2 Almost all of the published methods regarding CVAAS for mercury have utilized the spin-forbidden resonance line at 253.7 nm. [3][4][5][6][7] Based on the oscillator strength corresponding to the 184.9 nm mercury line (about 50-times greater than that of the 253.7 nm mercury line), an increase in sensitivity at 184.9 nm of at least an order of magnitude, compared to the 253.7 nm absorption line, would be predicted. It was demonstrated by Robinson et al 8 that the sensitivity of mercury determination at 184.9 nm line was higher than at 253.7 nm, but varied greatly with different types of radiation sources used.…”

Section: Introductionmentioning

confidence: 99%

Determination of Mercury in Fish Tissue Using a Minianalyzer Based on Cold Vapor Atomic Absorption Spectrometry at the 184.9 nm Line

Rizea

Bratu²,

Danet

et al. 2007

ANAL. SCI.

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A sensitive method was proposed and optimized for the determination of total mercury in fish tissue by using wet digestion, followed by cold vapor atomic absorption spectrometry (CVAAS) at the main resonance line of mercury (184.9 nm). The measurements were made using a new type of a non-dispersive mercury minianalyzer. This instrument was initially designed and built for atmospheric mercury-vapor detection. For determining mercury in aqueous samples, the minianalyzer was linked with a mercury/hydride system, Perkin Elmer Model MHS-10. To check the method, the analyzed samples were spiked with a standard solution of mercury. The recoveries of mercury spiked to wet fish tissue were >90% for 0.5 -0.8 g samples. The results showed a better sensitivity (about 2.5 times higher) when using the mercury absorption line at 184.9 nm compared with the sensitivity obtained by conventional CVAAS at 253.7 nm.

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“…[16][17][18] It has been reported that UV irradiation can be used to reduce some heavy metal ions to their metal or lower oxidation state intermediates in many samples, but most often with TiO2 or ZnO as a catalyst. [19][20][21][22][23] On the other hand, some metals in their organic states can also be converted to the inorganic state in aqueous solution with or without oxidation reagent, i.e., Hg 2+ , with UV irradiation, and then such metals can be determined by liquid chromatography and/or atomic spectrometry.…”

Section: Introductionmentioning

confidence: 99%

UV Irradiation Controlled Cold Vapor Generation Using SnCl2 as Reductant for Mercury Speciation

Zhang

Zheng

et al. 2006

ANAL. SCI.

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Determination of inorganic and total mercury by vapor generation atomic absorption spectrometry using different temperatures of the measurement cell

Cited by 73 publications

References 18 publications

Mercury speciation in urban landfill leachate by cold vapor generation atomic absorption spectrometry using ion exchange and amalgamation

Mercury speciation in urban landfill leachate by cold vapor generation atomic absorption spectrometry using ion exchange and amalgamation

Determination of Mercury in Fish Tissue Using a Minianalyzer Based on Cold Vapor Atomic Absorption Spectrometry at the 184.9 nm Line

UV Irradiation Controlled Cold Vapor Generation Using SnCl2 as Reductant for Mercury Speciation

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