Electrothermal behavior of sodium, potassium, calcium and magnesium in a tungsten coil atomizer and review of interfering effects

Queiroz, Zilvanir Fernandes; Krug, Francisco José; Oliveira, Pedro Vitoriano de; Silva, Márcia M.; Nóbrega, Joaquim A.

doi:10.1016/s0584-8547(01)00350-0

Cited by 21 publications

(11 citation statements)

References 26 publications

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“…Extensive literature is available on interference effects of concomitants on the analytical signals observed with tungsten coil atomic absorption spectrometry (WCAAS) [19,20]. While such effects may be similar in WCAES, a more detailed study is required to understand and minimize them.…”

Section: Analytical Figures Of Meritmentioning

confidence: 99%

Simultaneous determination of Cr, Ga, In and V in soil and water samples by tungsten coil atomic emission spectrometry

Donati

Kron

Jones

2009

Spectrochimica Acta Part B: Atomic Spectroscopy

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Section: Analytical Figures Of Meritmentioning

confidence: 99%

Simultaneous determination of Cr, Ga, In and V in soil and water samples by tungsten coil atomic emission spectrometry

Donati

Kron

Jones

2009

Spectrochimica Acta Part B: Atomic Spectroscopy

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“…Tungsten coil AES was proposed in 2005 by Rust et al [11] and several applications were developed [12][13][14][15]. However, the low temperature of the gas phase when using the tungsten coil atomizer [16] limits its application to elements with low excitation energies. New strategies are being investigated for improving the sensitivity such as recently demonstrated using Co as a chemical modifier to change the excitation mechanism of Cr [17].…”

Section: Introductionmentioning

confidence: 99%

Tungsten coil atomic emission spectrometry combined with dispersive liquid–liquid microextraction: A synergistic association for chromium determination in water samples

Vidal

Silva

Canals

et al. 2016

Talanta

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A novel and environmentally friendly analytical method is reported for total chromium determination and chromium speciation in water samples, whereby tungsten coil atomic emission spectrometry (WCAES) is combined with in situ ionic liquid formation dispersive liquid-liquid microextraction (in situ IL-DLLME).A two stage multivariate optimization approach has been developed employing a Plackett-Burman design for screening and selection of the significant factor involved in the in situ IL-DLLME procedure, which was later optimized by means were 3 and 10 µg L -1 , respectively. This is a 233-fold improvement when 2 compared with chromium determination by WCAES without using preconcentration. The repeatability of the proposed method was evaluated at two different spiking levels (10 and 50 µg L -1 ) obtaining coefficients of variation of 11.4 and 3.6% (n=3), respectively. A certified reference material (SRM-1643e NIST) was analysed in order to determine the accuracy of the method for total chromium determination and 112.3% and 2.5 µg L -1 were the recovery (trueness) and standard deviation values, respectively. Tap, bottled mineral and natural mineral waters were analysed at 60 µg L -1 spiking level of total Cr content at two Cr(VI)/Cr(III) ratios, and relative recovery values were ranged between 88 and 112% showing that the matrix has a negligible effect. To our knowledge, this is the first time that combines in situ IL-DLLME and WCAES.

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“…Formation of stable oxides and other analyte compounds whether in the condensed or the gas phases can reduce sensitivity and compromise precision and accuracy. 3,12,13 The importance of gas phase temperature and protecting gas composition for both WCAAS and WCAES is obvious from several works. [14][15][16] The severity of temperature gradients in a tungsten coil atomizer was emphasized in two different works, 17,18 with variations as significant as À250 K for each mm away from the coil surface.…”

Section: Introductionmentioning

confidence: 99%

Development of a novel spectrometric-based temperature probe and the investigation of atomic cloud generation in a tungsten coil atomizer

Donati

Jones

2011

J. Anal. At. Spectrom.

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A new two-element atomic emission temperature probe is developed and applied to gas phase temperature determinations in both a tungsten coil atomizer and an air/acetylene flame. Results are comparable to the traditional Sn two-line method, with variances as low as 0.08%. The spectrometricbased thermometer is composed of a handheld spectrometer, a fiber optic and a laptop computer. The method is an interesting alternative for a wide range of applications due to its simplicity, portability and high temperature capabilities. Its spatial resolution is especially desirable for spectroscopic studies. An updated version of the Sn two-line method is used to determine the temperature profile of a tungsten coil atomizer and study processes involved in atomic cloud generation in both atomic absorption and atomic emission spectrometry. Tungsten coil atomizers present significant temperature gradients and spectrometric methods based on them are critically dependent on some interrelated parameters such as gas phase temperatures, protecting gas composition, and ultimately, atomizer positioning relative to the detector. Sn atomic absorption, and Li and Cr atomic emission profiles were determined and compared with the atomizer temperature profile. Elements determined by atomic emission are more dependent on gas phase temperatures while Sn absorption signal is more dependent on the reducing atmosphere provided by H 2 molecules present in the protecting gas mixture. Cr presents higher emission signals in a H 2 -rich, more reducing environment, whereas Li is less dependent on both temperature and protecting gas composition. Those results reflect Li lower excitation energy and Cr refractory characteristics.

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Electrothermal behavior of sodium, potassium, calcium and magnesium in a tungsten coil atomizer and review of interfering effects

Cited by 21 publications

References 26 publications

Simultaneous determination of Cr, Ga, In and V in soil and water samples by tungsten coil atomic emission spectrometry

Simultaneous determination of Cr, Ga, In and V in soil and water samples by tungsten coil atomic emission spectrometry

Tungsten coil atomic emission spectrometry combined with dispersive liquid–liquid microextraction: A synergistic association for chromium determination in water samples

Development of a novel spectrometric-based temperature probe and the investigation of atomic cloud generation in a tungsten coil atomizer

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