Total Mercury Determination in Biological and Environmental Standard Samples by Gold Amalgamation Followed by Cold Vapor Atomic Absorption Spectrometry

Ombaba, Jackson M.

doi:10.1006/mchj.1996.0028

Cited by 34 publications

(20 citation statements)

References 16 publications

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“…Some mercury compounds have been used in agriculture, principally as fungicides [1]. Because effects of mercury compounds, their accurate determination in environmental samples has received great attention [2]. Concern over environmental pollution with mercury has intensified the search for analytical methods that require minimal sample preparation, and give contaminant-free analysis and good analytical sensitivity.…”

Section: Introductionmentioning

confidence: 99%

Inorganic and methyl-mercury speciation in sediments of the Swarzędzkie Lake

Barałkiewicz

Gramowska

Gołdyn

et al. 2007

Chemistry and Ecology

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Sediment samples were analysed for mercury and methylmercury content in different parts of the bottom sediment of Swarzędzkie Lake, which were influenced by different external pollution sources. The results of determination with two methods of mineralization using two separate media (HNO 3 /H 2 O 2 and HF) were compared. The accuracy of the studied methods was analysed using certified reference material IAEA 405 of river sediment. The recovery of mercury was satisfactory and ranged from 97.5 to 98.8%. Methylmercury compounds in the studied sediments were found in limited concentrations. Their concentrations ranged from 0.26 to 58.1 μg kg −1 , i.e. 1.0-7.4% of the total mercury content. The depth profile displayed high values of both total and methylmercury content at a depth of 10-20 cm, related to the heavy pollution of the lake in the 1980s. Canonical analysis displayed the relationship of both total mercury and methylmercury concentrations with organic matter and phosphorus content in bottom sediments.

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Section: Introductionmentioning

confidence: 99%

Inorganic and methyl-mercury speciation in sediments of the Swarzędzkie Lake

Barałkiewicz

Gramowska

Gołdyn

et al. 2007

Chemistry and Ecology

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“…However, despite the low limits of detection of CVAAS, the analysis of some samples requires a separation and preconcentration step. Several techniques for the preconcentration of mercury have been proposed, including coprecipitation [8], noble metal amalgamation [9,10,11], liquid-liquid extraction [12,13], solid phase extraction [14,15,16,17,18,19], purge-andtrap injection [20] and solid phase microextraction [21,22]. In comparison with solvent extraction, solid phase extraction is superior for preconcentration of trace metals in respect to minimum solvent waste generation, reduction of sample matrix effects and sorption of the target species on the solid surface in a more stable chemical form [23].…”

Section: Introductionmentioning

confidence: 99%

Speciation analysis of mercury in water samples by cold vapor atomic absorption spectrometry after preconcentration with dithizone immobilized on microcrystalline naphthalene

Shabani

Dadfarnia

Nasirizadeh

2004

Analytical and Bioanalytical Chemistry

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Trace amounts of inorganic mercury (Hg(2+)) and methylmercury cations (MeHg(2+)) were adsorbed quantitatively from acidic aqueous solution onto a column packed with immobilized dithizone on microcrystalline naphthalene. The trapped mercury was eluted with 10 ml of 7 mol L(-1) hydrochloric acid solution. The Hg(2+) was then directly reduced with tin (II) chloride, and volatilized mercury was determined by cold vapor atomic absorption spectrometry (CVAAS). Total mercury (Hgt) was determined after decomposition of MeHg(+) into Hg(2+). Hg(2+) and MeHg(+) cations were completely recovered from the water with a preconcentration factor of 200. The relative standard deviation obtained for eight replicate determinations at a concentration of 0.3 microg L(-1 )was 1.8%. The procedure was applied to analysis of water samples, and the accuracy was assessed via recovery experiment.

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“…Beside separation from matrix components, enrichment of an analyte could be achieved. In the case of mercury, various preconcentration/separation procedures include liquid-liquid extraction [12], amalgamation on a gold trap [7,13], and the application of solid sorbents [14,15,16,17,18,19,20,21]. Chelating resins containing sulfur atoms in the functional groups, such as dithiocarbamate and dithizone [14,15], thiocarbahydrazide [16], thiosalicylate [17], and 6-mercaptopurine [18], have been mainly evaluated for this purpose.…”

Section: Introductionmentioning

confidence: 99%

Use of solid-phase extraction to eliminate interferences in the determination of mercury by flow-injection CV AAS

Krata

Pyrzyńska

Bulska

2003

Analytical and Bioanalytical Chemistry

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Solid-phase extraction with two-step elution has been developed for effective elimination of copper and iron interference with mercury determination by flow-injection cold vapour atomic absorption spectrometry (CV AAS). Sodium tetrahydroborate(III) was used as reducing agent. Cation-exchanger Dowex 50Wx4 was applied for the sorption of mercury and both interfering ions. In the first step elution of Cu(II) and Fe(III) was performed using 0.5 mol L(-1) KF solution. Then mercury was eluted with 0.1% thiourea in 8% HCl. The detection limit (3 delta) for Hg(II) was 27 ng L(-1). The expanded uncertainty estimated for the whole procedure was about 6%. The accuracy of the proposed method was evaluated by determination of the recovery of known amount of mercury added to mineral, spring, and tap waters, and by analysis of a certified reference material BCR-144R (sewage sludge).

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Total Mercury Determination in Biological and Environmental Standard Samples by Gold Amalgamation Followed by Cold Vapor Atomic Absorption Spectrometry

Cited by 34 publications

References 16 publications

Inorganic and methyl-mercury speciation in sediments of the Swarzędzkie Lake

Inorganic and methyl-mercury speciation in sediments of the Swarzędzkie Lake

Speciation analysis of mercury in water samples by cold vapor atomic absorption spectrometry after preconcentration with dithizone immobilized on microcrystalline naphthalene

Use of solid-phase extraction to eliminate interferences in the determination of mercury by flow-injection CV AAS

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