Tungsten devices in analytical atomic spectrometry

Hou, Xiandeng; Jones, Bradley T.

doi:10.1016/s0584-8547(02)00014-9

Cited by 71 publications

(52 citation statements)

References 149 publications

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“…In the search for an improvement in cost-effectiveness the study of alternative atomization means in ET-AAS becomes quite relevant. Recently, the use of tungsten devices in analytical atomic spectrometry was reviewed thoroughly by Hou and Jones [7] showing that they continue to provide simple and versatile atomizer alternatives. Tungsten coil atomization as proposed in 1988 by Berndt and Schaldach [8] uses a double-layer coiled tungsten filament (150 W) and offers some advantages to enable the determination of As in solution samples, such as low power supply requirements, fast heating, and low cost of the coils [9].…”

Section: Introductionmentioning

confidence: 99%

Chemical modifiers in arsenic determination in biological materials by tungsten coil electrothermal atomic absorption spectrometry

Bruhn

Huerta

Neira

2004

Analytical and Bioanalytical Chemistry

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Palladium, iridium, and rhodium are evaluated as possible chemical modifiers in the determination of As in digest solutions of biological materials (human hair and clam) by tungsten coil electrothermal atomic absorption spectrophotometry (TCA-AAS). The modifier in solution was applied onto the coil and thermally pre-reduced; the pre-reduction conditions, the amount of modifier, and the thermal program were optimized. Palladium was not satisfactory, whereas Ir and Rh were effective modifiers and rendered better relative sensitivity for As by a factor of 1.4 and 1.9, respectively compared to the case without modifier. Upon optimization of thermal conditions for As in pre-reduced Ir (2.0 microg) and Rh (2.0 microg) modifiers and in the digest solutions of the study matrices, Rh (2.0 microg) was more effective modifier and was selected as such. The mean within-day repeatability was 2.8% in consecutive measurements (25-100 microg L(-1)) (3 cycles, each of n=6) and confirmed good short-term stability of the absorbance measurements. The mean reproducibility was 4.4% (n=20 in a 3-day period) and the detection limit (3 sigmablank/slope) was 29 pg (n=15). The useful coil lifetime in Rh modifier was extended to 300-400 firings. Validation was by determination of As in the certified reference material (CRM) of "Oyster tissue" solution with a percentage relative error (Erel%) of 2% and percentage relative standard deviation (RSD%) of 3% (n=4), and by analytical recovery of As spiked in CRM of human hair [94 +/- 8% (n=4)]. The methodology is simple, fast (sample readout frequency 21 h(-1)), reliable, of low cost, and was applied to the determination of As in hair samples of exposed and unexposed workers.

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Section: Introductionmentioning

confidence: 99%

Chemical modifiers in arsenic determination in biological materials by tungsten coil electrothermal atomic absorption spectrometry

Bruhn

Huerta

Neira

2004

Analytical and Bioanalytical Chemistry

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“…In addition, hydrogen could be used as the "fuel" of Ar-H2 flame for further atomization of the analyte and this could significantly influence the stability, temperature and hydrogen radical concentration of the flame. [15][16][17][18] Approximately 4 mg of wheat (GBW10011) (n = 5) was used to experiment and the effects of flow rate of the carrier gas were studied (Fig. 4).…”

Section: Flow Rate Of the Carrier Gasmentioning

confidence: 99%

Direct Determination of Lead in Foods by Solid Sampling Electrothermal Vaporization Atomic Fluorescence Spectrometry

et al. 2016

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A solid sampling method for the determination of lead in foods (including grains, vegetables and seafoods) using electrothermal vaporization atomic fluorescence spectrometry was established. The method introduced samples using electrothermal vaporization by quartz furnace and used on-line ashing and vaporization to remove matrix interferences for the specific trap of lead. It was proven by the certified reference material (CRM) and the recovery rate of the standards that the electrothermal vaporization was stable and there was no effect for sampling difference. The best operating program and parameters for the new method included ashing (850 C, 160 s), vaporization and trap (1050 C, 80 s; 800 C, 10 s), release (800 C, 10 s), and mixed Ar + H2 (85:15%, v/v) as carrier gas with flow rate of 500 mL/min. The relative standard deviations of repeated Pb measurements in CRMs were all below 5.0%, and the recovery rate ranged from 90.0 -110.0%. The limit of detection (LOD) for the new method was 3.0 pg and the limit of quantification (LOQ) was 10.0 pg. The total time of analysis was less than 6 min. No significant differences existed between the results measured by the new method and microwave ICP-MS.

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“…The small size, minimal power requirements, and low cost make W-coil devices attractive for field applications. [7][8][9] A portable tungsten coil atomic absorption spectrometry (WCAAS) device was developed in the early 1990s. The device measured 19 × 8 × 3 inches and was powered by a car battery.…”

Section: Introductionmentioning

confidence: 99%

A Portable Tungsten Coil Atomic Emission Spectrometer for the Simultaneous Determination of Metals in Water and Soil Samples

Hanna

Jones

2011

ANAL. SCI.

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Tungsten devices in analytical atomic spectrometry

Cited by 71 publications

References 149 publications

Chemical modifiers in arsenic determination in biological materials by tungsten coil electrothermal atomic absorption spectrometry

Chemical modifiers in arsenic determination in biological materials by tungsten coil electrothermal atomic absorption spectrometry

Direct Determination of Lead in Foods by Solid Sampling Electrothermal Vaporization Atomic Fluorescence Spectrometry

A Portable Tungsten Coil Atomic Emission Spectrometer for the Simultaneous Determination of Metals in Water and Soil Samples

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