Flame AAS determination of thallium in soils

Tsakovski, Stefan; Ivanova, E.; Havezov, I.

doi:10.1016/0039-9140(93)e0006-y

Cited by 9 publications

(4 citation statements)

References 15 publications

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“…Moreover, preconcentration is often required before the final measurements [19,20]. Special precautions must be undertaken to avoid thallium losses during digestion.…”

Section: Introductionmentioning

confidence: 99%

Slurry sampling for the determination of thallium in soils and sediments by graphite furnace atomic absorption spectrometry

Dobrowolski

2002

Anal Bioanal Chem

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The analytical conditions for thallium determination in soils and sediments by slurry sampling graphite furnace atomic absorption spectrometry were studied and optimized. Elimination of a strong background for soils rich in organic materials by application of tungsten carbides coated graphite tubes/platforms was studied in detail. Tungsten carbides increased the maximum permissible pyrolysis temperature from 300 to 900 degrees C. The mechanism of tungsten carbide formation on different graphite surfaces was proposed. Application of a strong basic anion-exchange resin for interference elimination in thallium determination in marine sediments was described. Calibration was performed directly using aqueous standards both for soil and sediment analysis. Analysis of CRM confirmed the reliability of the approach. The precision and accuracy of thallium determination by the described method for soils and sediments was acceptable. A characteristic mass of 13.8 pg was obtained and the limit of detection for the proposed method was around 0.06 microg g(-1) Tl.

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“…Moreover, preconcentration is often required before the final measurements [19,20]. Special precautions must be undertaken to avoid thallium losses during digestion.…”

Section: Introductionmentioning

confidence: 99%

Slurry sampling for the determination of thallium in soils and sediments by graphite furnace atomic absorption spectrometry

Dobrowolski

2002

Anal Bioanal Chem

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“…While many matrix interferences may be overcame by applying the "stabilized-temperature platform furnace" (STPF) concept together with matrix modification [9,10,12,14]; undoubtedly, matrix separation is often necessary to avoid spectral and non-spectral effects. Other alternative is an ETAAS determination of thallium preceded by separation and pre-concentration [13][14][15][16][17][18][19][20][21][22]. As an alternative of the classical batch procedures, a flow injection (FI) solid phase separation and pre-concentration coupled to ETAAS is an interesting way of trace determination [23,24].…”

Section: Introductionmentioning

confidence: 99%

Speciation analysis of thallium using electrothermal AAS following on-line pre-concentration in a microcolumn filled with multiwalled carbon nanotubes

et al. 2009

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The enrichment ability of carbon nanotubes (CNTs) was investigated and a new method established for the determination of trace thallium species in environmental samples using electrothermal atomization-atomic absorption spectrometry (ETAAS). The CNTs were employed as sorbent substrate in a continuous flow system coupled to ETAAS. Parameters influencing the recoveries of thallium were optimized. Under optimal conditions, the detection limit and precision of the method were 0.009 µg L −1 and 3.9%, respectively. The method was applied to the determination of thallium in real environmental samples and the recoveries were in the range from 96 to 100%. This system was able to separate thallium (I) from the matrix, which allowed its selective determination. The total thallium content was then determined by reducing Tl(III) with hydroxylamine. All these experimental results indicated that this new procedure can be applied to the determination of trace thallium in drinking water samples.

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“…Since the amount of Tl(I) in the samples is very low, it is necessary to preconcentrate the low contents before its determination. Among the preconcentration procedures, such as liquid-liquid extraction, [4][5][6] ion-exchange, [7][8][9] sorption, 10,11 and so on, flotation techniques have proven to be very efficient. 12,13 They allow handling of large volumes of samples and considerable savings in reagents and time.…”

Section: Introductionmentioning

confidence: 99%

Determination of Thallium(I) by Flotation-Spectrophotometric Method Using Iodide and Rhodamine B

Hosseini

Naseri

2003

ANAL. SCI.

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Flame AAS determination of thallium in soils

Cited by 9 publications

References 15 publications

Slurry sampling for the determination of thallium in soils and sediments by graphite furnace atomic absorption spectrometry

Slurry sampling for the determination of thallium in soils and sediments by graphite furnace atomic absorption spectrometry

Speciation analysis of thallium using electrothermal AAS following on-line pre-concentration in a microcolumn filled with multiwalled carbon nanotubes

Determination of Thallium(I) by Flotation-Spectrophotometric Method Using Iodide and Rhodamine B

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