Non-spectral and spectral interferences in inductively coupled plasma high-resolution mass spectrometry : Part I. Optical characteristics of micro-plasmas observed just behind the sampler and the skimmer in inductively coupled plasma high resolution mass spectrometry

Nonose, Naoko; Kubota, Masaaki

doi:10.1039/b100900l

Cited by 28 publications

(15 citation statements)

References 30 publications

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“…oxides), 1,2 collision-induced dissociation of polyatomic ions (formed in the ICP) and ionization of neutral species. 24 It is generally accepted that Hg cold vapor generation is free from matrix effects; only Hg vapor is produced using the SnCl 2 reductant and as such no pretreatment of the digested samples is required. However, a matrix effect is clearly discernible in the b Tl value.…”

Section: Discussionmentioning

confidence: 99%

The effect of hydride formation on instrumental mass discrimination in MC-ICP-MS: a case study of mercury (Hg) and thallium (Tl) isotopes

Georg

Newman

2015

J. Anal. At. Spectrom.

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Here we report evidence for enhanced hydride formation for Hg isotopes when using high sensitivity X skimmer cones and the Neptune MC-ICP-MS. The effect on the instrumental mass discrimination and the robustness of the Tl external mass-bias 20 correction was investigated. A series of experiments have been conducted to study the effect of variable Hg concentrations on the measured mass bias correction factor, ! Tl .The results of our experiments show a linear relation between the Hg concentration and the measured 205 Tl/ 203 Tl ratio of the internal standard. The resulting mass-bias correction factor ! Tl thus appears to be dependent on the analyte concentration, 25 questioning the applicability of Tl as an internal standard for high precision Hg isotope ratio measurements. These observations are consistent with the formation of Hg hydrides (HgH x where x = 1, 2). Numerical simulations show Hg hydride formation rates of 0.02 to 0.18% to be consistent with experimental observations, when using high-sensitivity X skimmer cones. Here we discuss the implications of Hg 30 hydride formation for Hg isotope ratio measurements and propose a set of precautionary steps that can help to identify and remediate analytical issues related to hydride formation. Whilst the effect of hydride formation on mass-dependent Hg isotope ratios can be controlled, mass independent Hg ratios are shown to be very sensitive to hydride formation. A comparison between different types of sediment 35 samples and standards also suggests a matrix dependency on hydride formation. We conclude that precise and accurate Hg isotope ratio determination using MC-ICP-MS is possible, however, probably not to low ppm-levels of precision.

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Section: Discussionmentioning

confidence: 99%

The effect of hydride formation on instrumental mass discrimination in MC-ICP-MS: a case study of mercury (Hg) and thallium (Tl) isotopes

Georg

Newman

2015

J. Anal. At. Spectrom.

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“…Nonose and Kubota investigated the optical characteristics of microplasmas behind the sampler and skimmer cone and observed an influence of the acceleration voltage on the formation of polyatomic interferences, as well. 53 Many approaches to cope with the problem of spectral interferences have been discussed since the early days of ICP-MS. 51 The most straightforward method to overcome limitations from spectroscopic interferences is the application of high mass resolution. The high mass resolution capability of ICP-SFMS allows the identification of interferences and ions of interest on the basis of their exact mass easily and from such observations, we can already define major groups of possible spectroscopic interferences and some of their features:…”

Section: Spectral Interferencesmentioning

confidence: 99%

Inductively Coupled Plasma Mass Spectrometry

Jakubowski

Horsky

Roos

et al. 2014

Sector Field Mass Spectrometry for Elemental and Isotopic Analysis

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ICP-MS is based on the formation of (preferentially monovalent positively) charged atomic ions in an inductively coupled Ar plasma at almost 10 000 K. The ions formed are transferred from the plasma source at ambient pressure into a mass separator operated at high vacuum via a set of cones. The ions are separated according to their mass/charge ratio in the mass separator (quadrupole, magnetic sector field or time-of-flight mass separator). In most cases, the ions are detected using a secondary electron multiplier; in some set-ups (also) a Faraday cup can be used. Single-collector (scanning mass spectrometer usually used for quantitative elemental analysis) or multicollector (static operation of mass spectrometer for precise isotope ratio analysis) configurations can be found (Figures 12.1 and 12.2).

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Section: Spectroscopic Interferencesmentioning

confidence: 99%

Inductively coupled plasma- and glow discharge plasma-sector field mass spectrometry : Part I. Tutorial: Fundamentals and instrumentation

Jakubowski

Prohaska

Rottmann

et al. 2011

J. Anal. At. Spectrom.

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The aim of this series of two reviews is to introduce the basic concepts of ICP and GD sector field instruments, to discuss their peculiarities and performance, to present selected analytical applications for demonstration of the 'state of the art' and, finally, to identify possible future trends and developments. Part I focuses on fundamentals, instrumentation and operation of instruments to give an overview of the capabilities of the actual commercially available instrumentation, whereas selected applications will be discussed in detail in part II.

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Non-spectral and spectral interferences in inductively coupled plasma high-resolution mass spectrometry : Part I. Optical characteristics of micro-plasmas observed just behind the sampler and the skimmer in inductively coupled plasma high resolution mass spectrometry

Cited by 28 publications

References 30 publications

The effect of hydride formation on instrumental mass discrimination in MC-ICP-MS: a case study of mercury (Hg) and thallium (Tl) isotopes

The effect of hydride formation on instrumental mass discrimination in MC-ICP-MS: a case study of mercury (Hg) and thallium (Tl) isotopes

Inductively Coupled Plasma Mass Spectrometry

Inductively coupled plasma- and glow discharge plasma-sector field mass spectrometry : Part I. Tutorial: Fundamentals and instrumentation

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