A dynamic model for the elucidation of a mechanism of analyte transformation in an inductively coupled plasma

Li, K. P.; Dowling, M. F.; Fogg, Thomas R.; Yu, Tiing; Yeah, K. S.; Hwang, J. D.; Winefordner, J. D.

doi:10.1021/ac00166a023

Cited by 12 publications

(5 citation statements)

References 52 publications

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“…There is some evidence for MO + formation in the bulk plasma; YO + emission bands have been observed in the ICP, for example. 16,17 In another study, 8 calculations of the source kinetic temperature (by comparison of the theoretical and experimental dissociation reactions of common polyatomic species in the ICP) suggested that strongly bound metal ions, such as CeO + , are formed in the bulk plasma. However, the results of this and preceding work 9 unambiguously show that elevated MO + /M + ratios are associated with high sensitivity skimmer cone geometries.…”

Section: High Sensitivity Skimmer Cone Geometries and Mo + Formationmentioning

confidence: 99%

“…Data obtained with standard sample cone and guard electrode (GE) grounded (on) unless stated otherwise, 2RSD (ppm) given in parentheses, deviation is given by (R c -R t )/R t Â 1000000, where R c is the measured isotope ratio (corrected for mass fractionation) and R t is the assumed true isotope ratio (reference values, row 1), n ¼ 2 unless stated otherwise. Isotope ratio data for NdO + corrected for Nd17 O and Nd18 O interferences…”

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confidence: 99%

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Effects of the sampling interface in MC-ICP-MS: Relative elemental sensitivities and non-linear mass dependent fractionation of Nd isotopes

Newman

2012

J. Anal. At. Spectrom.

105

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Relative elemental sensitivities are reported for a number of sample and skimmer cone combinations, with standard and enhanced pumping of the interface region, for the Thermo Scientific Neptune MC-ICP-MS. An approximate two-fold sensitivity enhancement was observed for Sr, Nd, Hf, Pb and U using the Jet sample cone and an enhanced pumping configuration, compared to the standard arrangement. In the case of Li, the standard sample cone and enhanced pumping configuration gave the maximum sensitivity. In addition to improved ion transmission, the X skimmer cone geometry is also associated with additional contributions to the instrumental mass fractionation (at least in the case of Nd) that do not have a simple exponential dependence on the isotope mass. Neodymium isotope ratios measured using the X cone displayed large deviations (up to $750 ppm) from the reference (i.e. 'true') values. Similar deviations have been reported previously when using high sensitivity skimmer cone geometries on the Nu MC-ICP-MS instruments (K. Newman et al., J. Anal. At. Spectrom., 2009, 24, 742). The reported non-linear contribution to the instrumental mass fractionation with respect to Nd is not specific to a particular MC-ICP-MS instrument; it is associated with an increase in the NdO + /Nd + ratio, due to either a change in the plasma operating conditions (e.g. an increase in the sample gas flow, absence of a secondary discharge at the interface, change in plasma gas composition) or modification of the cone geometry. The role of secondary discharge formation and the physical and chemical processes occurring in the supersonic expansion with respect to NdO + formation are discussed.

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Section: High Sensitivity Skimmer Cone Geometries and Mo + Formationmentioning

confidence: 99%

mentioning

confidence: 99%

Effects of the sampling interface in MC-ICP-MS: Relative elemental sensitivities and non-linear mass dependent fractionation of Nd isotopes

Newman

2012

J. Anal. At. Spectrom.

105

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“…1 is the emission cloud surrounding the droplet, not the droplet itself. 4 This cloud in Frame 691 has a dark red core, which we believe to be primarily YO emission, 28,29 from comparison with the appearance of the outer fringes of the axial channel upstream inside the torch. The dark red center of this cloud is approximately 1 mm in diameter.…”

Section: Resultsmentioning

confidence: 92%

“…The central core is surrounded by pale red emission, ascribed to neutral Y emission. 28,29 This neutral Y cloud is approximately 2 mm diameter.…”

Section: Resultsmentioning

confidence: 99%

High-speed photographic study of vaporclouds from wet droplets and the subsequent solid particles in an inductively coupled plasma

Ebert

Saetveit

Bajic

et al. 2020

J. Anal. At. Spectrom.

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“…It was assumed that the measured emission profiles can be theoretically approximated by the distribution functions generated from the reaction kinetics within the selected droplet (30). The zeroth moment of an emission profile is, by definition, a measure of the total amount of the emitting analyte species.…”

Section: Methodsmentioning

confidence: 99%

Studies of chemical interferences in an inductively coupled plasma using moment analysis of space-resolved emission profiles

Li¹,

Hwang²,

Winefordner³

1990

Anal. Chem.

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Interelement effects induced by sodium, aluminum, and phosphate ion on calcium and magnesium emission were studied with a two-channel spectrometer that could record spatially resolved emission profiles of an atom line and an ion line simultaneously. The statistical moments of the digitized emission profiles were calculated and were employed for rate-constant estimation using our previously established theory. Interelement effects are results of interferences in the analyte atomization, ionization, and/or recombination steps. Characteristic changes will be induced in the emission profiles by each of these interferences. These changes can be characterized by the statistical moments of the corresponding profiles. Therefore, by investigating variations in the rate constants caused by the specific concomitant, one may better understand the analyte atomization-excitation mechanisms. Sodium enhances the atomic emission of both calcium and magnesium but has little effect on their ionic emission. Based on the trends of variation in the rate constants, the atomic signal enhancement seems to be attributed more to the facilitation of analyte atomization rather than to the shift of ionization equilibrium. Aluminum and phosphate ion appear not to induce significant interferences on either elements.

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A dynamic model for the elucidation of a mechanism of analyte transformation in an inductively coupled plasma

Cited by 12 publications

References 52 publications

Effects of the sampling interface in MC-ICP-MS: Relative elemental sensitivities and non-linear mass dependent fractionation of Nd isotopes

Effects of the sampling interface in MC-ICP-MS: Relative elemental sensitivities and non-linear mass dependent fractionation of Nd isotopes

High-speed photographic study of vaporclouds from wet droplets and the subsequent solid particles in an inductively coupled plasma

Studies of chemical interferences in an inductively coupled plasma using moment analysis of space-resolved emission profiles

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