Evaluation of some wet decomposition methods for mercury determination in biological and environmental materials by cold vapour atomic absorption spectroscopy

Adeloju, Samuel B O; Dhindsa, Harkirat S.; Tandon, R.K.

doi:10.1016/0003-2670(94)80076-6

Cited by 47 publications

(18 citation statements)

References 8 publications

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“…The influence of the acid mixtures on the detection limit and sensitivity of the CV-AAS technique for mercury determination was similar for all of the digestion mixtures. 4 The presence of other components, such as H2SO4, KMnO4, K2Cr207 or K2S208, in the mixture was used to enhance the partition coefficient of mercury between vapor and solution.4,16 Although the addition of oxidizing components (HC104, H2O2) increased the efficiency of the digestion, it may be more explosive.4 As a better alternative, a pressure-feedback microwave-digestion procedure has been developed. Most of the additional chemicals in the digestion mixture were no longer important when closed-vessel microwave-digestion was used, since the selected parameter settings could produce similar effects.…”

Section: Analytical Proceduresmentioning

confidence: 99%

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Comparison of Acid Mixtures in High-Pressure Microwave Digestion Methods for the Determination of the Total Mercury in Sediments by Cold-Vapor Atomic Absorption Spectrometry

et al. 1996

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Four closed-vessel microwave digestion methods were compared for the accurate determination of mercury in sediments by flow-injection cold-vapor atomic absorption spectrometry. The results showed that several acid mixtures (HNO3/ H2SO4, HNO3/ HC10a, HCI/ HNO3 and HCl/ HNO3/ HF) completely digested'the soil matrix for the determination of mercury. The method using aqua regia is preferred because it is time saving, less dangerous and suitable for other tracemetal analyses. The merits of pressure-feedback microwave digestion is that it simplifies soil sample digestion, and there is no loss of mercury. The digestion methods were evaluated by determining mercury in NIST SRM 1645 River Sediment, NIES CRM No. 2 Pond Sediment and NRCC BCSS-1 Marine Sediment. Recoveries of 92 -108were achieved. Good recoveries of 94 -104% were also obtained for soil and marine-sediment samples spiked with different species of mercury.

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Section: Analytical Proceduresmentioning

confidence: 99%

“…Consequently, wet digestion at relatively low temperatures (<100°C) is often used. 4 Although wet digestion is important, it is generally very time consuming in the determination of mercury in sediment and other environmental samples.…”

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confidence: 99%

Comparison of Acid Mixtures in High-Pressure Microwave Digestion Methods for the Determination of the Total Mercury in Sediments by Cold-Vapor Atomic Absorption Spectrometry

et al. 1996

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“…Very often, in order to reach the best conditions for the analysis of different samples, a decomposition, generally with specific acids for different matrices, is suggested in the literature, such as the use of aqua regia [4][5] or of a mixture of nitric and sulfuric acids, followed by the addition or not of hydrogen peroxide [6][7][8][9][10] for biological and environmental matrices. However these procedures are tedious, use a lot of glassware and reagents, increasing the risk of Hg contamination or loss in the laboratory.…”

Section: Introductionmentioning

confidence: 99%

Slurry sampling for Hg determination in sediments, sewage sludge and coal samples by cold vapor atomic absorption spectrometry

Ribeiro¹,

Vieira²,

Curtius³

2004

J. Braz. Chem. Soc.

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Um método simples e robusto para a determinação de Hg em amostras ambientais por espectrometria de absorção atômica com geração de vapor frio diretamente de suspensões ácidas é proposto. Após redução do tamanho das partículas da amostra para ≤ 50 µm em gral de ágata, dois procedimentos foram utilizados para a preparação das suspensões: com 6,7% v/v de ácido nítrico ou 10% v/v de água-régia mais 2% v/v de ácido fluorídrico. Dependendo da amostra, a concentração da amostra na suspensão variou de 3,3 a 23 mg mL -1 . O vapor frio de Hg gerado diretamente das suspensões ácidas das amostras foi conduzido para o tubo T de quartzo, posicionado no lugar do atomizador do espectrômetro. Oito amostras ambientais de referência certificadas foram analisadas. Pelo uso da calibração convencional com padrões aquosos, excelentes resultados foram obtidos quando a água-régia mais o ácido fluorídrico foram utilizados nas suspensões. Amostras de sedimento e carvão de Santa Catarina, Brasil, também foram analisadas. O limite de detecção foi de 30 ng g -1 .Simplicidade, baixo custo e alta eficiência são algumas qualidades do método proposto, mostrandose adequado para análises de rotina.A simple and robust method for the determination of Hg in environmental samples by slurry sampling cold vapor generation atomic absorption spectrometry is proposed. After reducing the sample particles size to ≤ 50 µm in an agate mortar, two procedures were used in the slurry preparation: either using 6.7% v/v nitric acid only or 10% v/v aqua regia plus 2% v/v hydrofluoric acid medium. Depending on the sample, the slurry concentrations varied from 3.3 to 23 mg mL -1 . The mercury cold vapor generated directly from the acidified sample slurry was conducted to quartz T tube, placed in the atomizer of the spectrometer. Eight certified environmental materials were analyzed. By using the conventional calibration against aqueous standard solutions, excellent results were obtained when aqua regia plus hydrofluoric acid was used as the slurry medium. Sediment and coal samples from Santa Catarina, Brazil were also analyzed. The obtained limit of detection was 30 ng g -1 . Simplicity, low cost and high efficiency are some of the qualities of the proposed method, making it adequate for routine analysis.

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“…One challenge is the choice of sample dissolution technique in which the various mercury species are to be solubilised as the inorganic mercury 2+ ion. 22,24 It is well known that mercury is easily volatilised, so samples cannot be heated to high temperatures without analyte loss and this complicates the use of microwave-assisted digestion and hotplate digestions.…”

Section: Preparation Of Solutions and Standardsmentioning

confidence: 99%

Trace determination of total mercury in rice by conventional inductively coupled plasma mass spectrometry

Drennan-Harris

Wongwilawan

Tyson

2013

J. Anal. At. Spectrom.

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Mercury is a potent neurotoxin with which food and beverages may be contaminated from a number of sources, both natural and anthropogenic. The determination of mercury at concentrations close to instrumental detection limits suffers from problems related to memory effects and loss, both during sample preparation and within sample introduction systems. L-cysteine (1%) was added to rice samples, standards, and rinse solutions in order to keep the mercury in solution and decrease the memory effect.Gold ( Mercury and its compounds are highly toxic and are of major concern due to their widespread distribution in the environment and the ability of living systems to accumulate them within the food chain.

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Evaluation of some wet decomposition methods for mercury determination in biological and environmental materials by cold vapour atomic absorption spectroscopy

Cited by 47 publications

References 8 publications

Comparison of Acid Mixtures in High-Pressure Microwave Digestion Methods for the Determination of the Total Mercury in Sediments by Cold-Vapor Atomic Absorption Spectrometry

Comparison of Acid Mixtures in High-Pressure Microwave Digestion Methods for the Determination of the Total Mercury in Sediments by Cold-Vapor Atomic Absorption Spectrometry

Slurry sampling for Hg determination in sediments, sewage sludge and coal samples by cold vapor atomic absorption spectrometry

Trace determination of total mercury in rice by conventional inductively coupled plasma mass spectrometry

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