Determination of arsenic in sediments, coal and fly ash slurries after ultrasonic treatment by hydride generation atomic absorption spectrometry and trapping in an iridium-treated graphite tube

Vieira, Mariana Antunes; Welz, Bernhard; Curtius, Adilson José

doi:10.1016/s0584-8547(02)00211-2

Cited by 56 publications

(51 citation statements)

References 25 publications

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“…Based on the work of Vieira et al [20][21] and of Flores et al, 16 two procedures were tested, using two different acid media in the slurries. All samples were ground in an agate mortar and passed through a ≤ 50 µm polyester sieve.…”

Section: Slurry Preparationmentioning

confidence: 99%

“…The slurry sampling usually allows the use of aqueous standard solutions for calibration or the analyte addition technique, not requiring certified reference materials for this purpose. 2,12,16,[19][20][21] Garcia et al 22 have demonstrated the analysis of coal fly ash and in diatomaceous earth as slurry. An aliquot of the slurry supernatant was used to determined Hg by CV AAS.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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Section: Slurry Preparationmentioning

confidence: 99%

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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“…Slurry sampling HG without preextraction was reviewed (Matusiewicz 2003) and used for the determination of total arsenic in different samples such as sediments, coal, and fly ash by atomic absorption spectrometry (AAS) (Vieira et al 2002); plant materials by inductively coupled plasma atomic emission spectrometry (Li et al 1998); and milk samples by AFS (Cava-Montesinos et al 2004). The slurry sampling method enabled the successful analysis of solid samples without pretreatment before analysis.…”

Section: Introductionmentioning

confidence: 99%

Speciation Analysis of Trace Inorganic Arsenic in Dietary Supplements by Slurry Sampling Hydride Generation Atomic Absorption Spectrometry

2010

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A new, rapid, and sensitive method was developed for speciation analysis of inorganic arsenic in dietary supplements using slurry sampling hydride generation atomic absorption spectrometry. As(III) content was determined under 1% HCl acidity conditions using both inhibitory effect of 8-hydroxyquinoline (8-HQ) on As(V) and its enhancing effect on As(III). Total inorganic arsenic content was determined under 5% HCl acidity conditions using the enhancing effect of 8-HQ on both As(III) and As (V). The method detection limit (S/N=3) was 4.0 μg kg -1 for As(III) and 4.5 μg kg -1 for total inorganic arsenic. This method was validated using the Chinese standard method (GB/T 5009.11-2003), in good agreement with total inorganic arsenic content in real samples. The developed method was successfully applied to the speciation analysis of inorganic arsenic in dietary supplements with satisfactory results.

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“…7,8 However, when a flow injection (FI) system is used for arsenic hydride generation, particles deposits in the tubing and other parts of the system may hinder the analysis. In addition, standard addition calibration may be necessary due to matrix interference.…”

Section: Introductionmentioning

confidence: 99%

Arsenic Determination in Marine Sediment Using Ultrasound for Sample Preparation

et al. 2007

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This work deals with As determination in marine sediment using ultrasound for sample preparation. It is shown that As can be quantitatively extracted from marine sediment using 20% (v/v) HCl and sonication. The slurry is centrifuged and the analyte is determined in the supernatant by hydride generation atomic absorption spectrometry (HG AAS). A flow injection (FI) system is employed for hydride generation, with 0.5% (m/v) NaBH4 used as reducdant and a 20% (v/v) HCl used as sample carrier. The limit of quantification is 1.6 μg g -1 of As, which is based on 800 μl of sample solution and 0.200 g of sample mass in a volume of 50 mL. Certified and non certified marine sediment samples were analyzed; the results were in accordance with the certified or reference values. Speciation analysis by HPLC-ICP-MS showed that As(V) is the only detectable As species present in the supernatant of the centrifuged sample.

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Determination of arsenic in sediments, coal and fly ash slurries after ultrasonic treatment by hydride generation atomic absorption spectrometry and trapping in an iridium-treated graphite tube

Cited by 56 publications

References 25 publications

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

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

Speciation Analysis of Trace Inorganic Arsenic in Dietary Supplements by Slurry Sampling Hydride Generation Atomic Absorption Spectrometry

Arsenic Determination in Marine Sediment Using Ultrasound for Sample Preparation

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