Comparison of Axially and Radially Viewed Inductively Coupled Plasma Atomic Emission Spectrometry in Terms of Signal-to-Background Ratio and Matrix Effects

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

doi:10.1039/a606445k

Cited by 80 publications

(40 citation statements)

References 16 publications

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“…7 and 8, the plots of I rel versus the line were quite flat; these findings suggested that the plasma was working under rather robust conditions. 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.…”

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.

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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...

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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.

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“…However, this first optimized method was unsatisfactory. A way to obtain robust conditions is to vary power supply, aerosol flow rate and carrier gas flow rate [5,6,9,15]; the transfer of energy between plasma and sample depend strongly on these parameters. The power influences the energy available in the plasma.…”

Section: Resultsmentioning

confidence: 99%

“…It can result a significant analytical error for samples with high concentration of dissolved solids such as mineralized plant solutions. Interferences of this type have been reported in axial-view ICP equipped with pneumatic nebulizer and can at times be quite severe [5,6,9]. On other hand, previous studies have also reported matrix effects in radial view system with USN [10,[12][13][14].…”

Section: Introductionmentioning

confidence: 91%

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Matrix effects during trace elements analysis in plant samples by inductively coupled plasma atomic emission spectrometry with axial view configuration and ultrasonic nebulizer

et al. 1999

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Abstract. Plant matrix effects have been characterized during trace element analysis by axial view inductively coupled plasma atomic emission spectrometry with ultrasonic nebulizer. Six elements were studied: As, Cd, Co, Cr, Ni, and Pb. The interferences were simulated by measuring analyte signals on solutions containing various concentrations of elements encountered in mineralized plant samples such as K, Ca, Mg, P, Na, Fe and Mn. Signal suppression is observed for the ionic lines and signal enhancement occurred for atomic lines. The effects were found to be caused by particles and easily ionizable elements (EIEs) into the central channel of the plasma. The particle vaporization led to lower plasma temperatures and decreased emission intensities. EIEs changed the ion/atom ratio toward atom and improved the atomic emission intensities. Use of a plant sample on the analytical signal of trace elements led to same conclusions. The matrix effects can be removed by using high generator power especially for the ionic spectra lines.

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“…A ICP OES surgiu como técnica analítica na metade dos anos 60 (Greenfield et al, 1964;Wendt;Fassel, 1965), e desde então essa técnica tem tido grande aceitação entre os químicos analíticos, principalmente devido ao fácil manuseio dos equipamentos, capacidade de realizar análises multielementares e ao relativamente baixo efeito de matriz (Dubuisson et al, 1997).…”

Section: Indutivamente (Icp Oes)unclassified

Estudo da matéria orgânica e composição elementar de solos arenosos de regiões próximas a São Gabriel da Cachoeira no Amazonas

Santos¹

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Comparison of Axially and Radially Viewed Inductively Coupled Plasma Atomic Emission Spectrometry in Terms of Signal-to-Background Ratio and Matrix Effects

Cited by 80 publications

References 16 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

Matrix effects during trace elements analysis in plant samples by inductively coupled plasma atomic emission spectrometry with axial view configuration and ultrasonic nebulizer

Estudo da matéria orgânica e composição elementar de solos arenosos de regiões próximas a São Gabriel da Cachoeira no Amazonas

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