Comparison of ionic line-based internal standardization with axially and radially viewed inductively coupled plasma atomic emission spectrometry to compensate for sodium effects on accuracy

Dubuisson, Cendrine; Poussel, Emmanuelle; Mermet, Jean‐Michel

doi:10.1039/a805424j

Cited by 63 publications

(47 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…32 In order to efficiently use the IS technique, a robust plasma should be used. 33 Furthermore, under these conditions, a single element could be used as IS for correcting for matrix effects on lines with very different energies. Hence, the peaks for the different elements were divided point by point by those corresponding to an element (acting as IS).…”

Section: Analytical Signalmentioning

confidence: 99%

Compensation for matrix effects in ICP-AES by using air segmented liquid microsample introduction. The role of the spray chamber

Todolı́¹,

Pérez²,

Mermet³

2004

J. Anal. At. Spectrom.

Self Cite

View full text Add to dashboard Cite

The combination of sample injection into an air carrier stream (i.e., air segmentation) with a low sample consumption system has been evaluated for the analysis of microsamples through ICP-AES. A PFA micronebulizer has been coupled to: (i), a double pass spray chamber; (ii), a Cinnabar cyclonic spray chamber; and (iii), a torch integrated sample introduction system, TISIS. Three matrices have been studied: in addition to water two concentrated acid solutions (2 mol l 21 nitric acid and 1.7 mol l 21 acetic acid) and Na 5,000 mg ml 21 . A simulation of the evolution of the drop size distributions of the aerosols with time was carried out in order to evaluate the extent of solvent evaporation inside the chamber. The total mass of solvent evaporated inside the chamber was estimated and it was concluded that, at 25 uC, about 4-6 s residence time were required to promote the maximum evaporation of the solvent. In order to ensure this, discrete sample introduction into an air carrier stream (i.e., air segmentation) was used. Narrow peaks (i.e., with a full width at half maximum, FWHM, as short as 10 s) were obtained for a 10 ml injected sample. The peaks found for the Cinnabar and TISIS were narrower than those for the double pass spray chamber. More importantly, the interferences caused by inorganic as well as organic matrices were less severe in discrete than in continuous mode. The theoretical simulations allowed explanation of these results in terms of the enhancement of the solvent evaporation both for water and matrices in this operating mode. The enhanced solvent evaporation with respect to the situation in continuous mode minimized differences in analyte transport towards the plasma induced by these compounds. Despite this, in discrete mode a residual matrix effect was found that was attributed to the aerosol transport process. Internal standardization (IS) was applied to transient signals and the interferences were compensated for in virtually all the cases. Good results were obtained for the four emission lines taken as internal standards (i.e., Mg 280.270, Co 228.616, Cr 205.552 and Cu 324.754). However, for acetic acid and a few lines, IS was not efficient for removing interferences. The methodology was validated by analyzing two reference solid samples of foods (i.e., bovine liver and mussel tissue). By using Cd 214.438 as internal standard and under discrete mode 100% recoveries were found.In the field of ICP techniques, the analysis of microsamples is an issue of recent interest.1 Among the different methods, the use of a micronebulizer coupled to a low inner volume spray chamber has reached acceptance because of its simplicity and reliability.2 Pneumatic micronebulizers are widely used for applications requiring consumption of only several microliters of solution per minute. As regards the spray chamber, besides double pass designs, the so called Cinnabar has been extensively used for the analysis of microsamples.3,4 The Cinnabar chamber is of cyclonic type but has a low inner volume so as to shorten th...

show abstract

Section: Analytical Signalmentioning

confidence: 99%

Compensation for matrix effects in ICP-AES by using air segmented liquid microsample introduction. The role of the spray chamber

Todolı́¹,

Pérez²,

Mermet³

2004

J. Anal. At. Spectrom.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Later on, several works were published comparing matrix effects observed in both configurations due to the introduction of easily ionized elements (EIE´s), [5][6][7][8] acids, 9 and the possibility of using internal standards for interference correction. 10 A comprehensive review comparing the analytical performance of axially and radially ICP OES systems were published in 2000 by Brenner and Zander.…”

Section: Introductionmentioning

confidence: 99%

Inductively coupled plasma optical emission spectrometry with axially viewed configuration: an overview of applications

Trevizan¹,

Nóbrega²

2007

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

Geralmente aceita-se que espectrômetros de emissão óptica com plasma acoplado indutivamente (ICP OES) com configuração axial apresentam efeitos de matriz mais severos quando comparados aos equipamentos com configuração radial, embora gerem menores limites de detecção. Entretanto, o desenvolvimento de detectores de estado sólido associado ao arranjo óptico Littrow com rede echelle e interfaces apropriadas para remoção da zona fria do plasma vêm possibilitando a expansão do uso dessa configuração. Nesta revisão são discutidos trabalhos publicados no período de 1999 a 2006 que fazem uso da configuração axial para avaliação dos efeitos de matriz, otimização das condições de operação e análise de diversos tipos de amostras, incluindo a introdução de amostras complexas, tais como suspensões.It is generally assumed that inductively coupled plasma optical emission spectrometers (ICP OES) with axial configuration present severe matrix effects when compared to radially viewed ones, although lower detection limits are obtained. However, the development of solid state detectors associated with a Littrow optical arrangement with an echelle grating and proper interfaces for plasma tail cut off led to an increase of analytical applications based on axially viewed configuration. In this review, papers published from 1999 to 2006 using this configuration for matrix effects evaluation, optimization of the operating conditions and analysis of complex samples, such as slurries, are discussed.

show abstract

“…[37][38][39] Similar findings have been previously reported in the literature. 40 A possible explanation for the change in the signal could be related to the formation of small salt deposits in the injector tube.…”

Section: Analytical Figures Of Meritmentioning

confidence: 99%

The role of the nebulizer on the sodium interferent effects in inductively coupled plasma atomic emission spectrometry

Cano

Todolı́

Hernandis

et al. 2002

J. Anal. At. Spectrom.

View full text Add to dashboard Cite

The role of the nebulizer on the sodium chloride interferent effects in ICP-AES was investigated. Three different pneumatic nebulizers coupled to a cyclonic spray chamber were investigated: a V-groove (VGN) and two new pneumatic concentric nebulizers specifically designed to work with saline solutions (the 'Seaspray' nebulizer, SSN, and experimental nebulizer, EN). The effect of the salt concentration on the characteristics of the aerosols generated by the nebulizers (primary aerosols) and those at the exit of the spray chamber (tertiary aerosols) on the transport parameters and on the analytical figures of merit in ICP-AES were evaluated. The characteristics of the primary aerosols were related to their critical dimensions and were independent of the solution salt concentration. Solvent and analyte transport rates were related to the characteristics of the primary aerosols. Thus, the SSN provided the highest solution transport rates followed by the EN and VGN. The Mn II emission signal correlated quite well with transport parameters. When the salt concentration increased, an interference effect on the ICP-AES emission signal was observed. This effect was related to the nebulizer employed. Thus, for the SSN, the effect of the sodium chloride on the emission signal was different for the ionic and atomic lines. For the remaining nebulizers, a depressive effect of the salt concentration on the emission signal was always observed irrespective of the line considered. The magnitude of the interference was different for each nebulizer and was related to the amount of solvent transported to the plasma. In general terms, by increasing the salt concentration, poorer signal precision and limits of detection were obtained. These results confirm the importance of sustaining robust plasma conditions to reduce the sodium chloride interferences.

show abstract

Comparison of ionic line-based internal standardization with axially and radially viewed inductively coupled plasma atomic emission spectrometry to compensate for sodium effects on accuracy

Cited by 63 publications

References 34 publications

Compensation for matrix effects in ICP-AES by using air segmented liquid microsample introduction. The role of the spray chamber

Compensation for matrix effects in ICP-AES by using air segmented liquid microsample introduction. The role of the spray chamber

Inductively coupled plasma optical emission spectrometry with axially viewed configuration: an overview of applications

The role of the nebulizer on the sodium interferent effects in inductively coupled plasma atomic emission spectrometry

Contact Info

Product

Resources

About