| Zugriffsnummer | 45978 |
| Dokumenttyp | Zeitschriftenartikel |
| Peer Review | mit Peer Review |
| Sprache | Englisch |
| Titel | Investigation of mass-scale drift effects in the milli-mass range: Influence on high mass resolution mode multicollector-inductively coupled plasma mass spectrometer isotope ratio measurements. |
| Autor(in); Institution |
Pramann, Axel; 3.1, Allgemeine und Anorganische Chemie, PTB-Braunschweig
Noordmann, Janine; 6.1, Radioaktivität, PTB-Braunschweig
Rienitz, Olaf; 3.1, Allgemeine und Anorganische Chemie, PTB-Braunschweig
|
| Quelle/Jahr | Journal of Mass Spectrometry: 56 (2021), 6 |
| ISSN | 1076-5174 (PRINT) ; 1096-9888 (ONLINE) |
| DOI | |
| Verlag | Bognor Regis [u.a.]: Wiley |
| Freie Schlagworte | high-resolution MC-ICP-MS ; isotope ratios ; magnetic sector field MS ; mass scale drift |
| Zusammenfassung | The consequences, possible origins, and prevention of mass-scale drifts in the high mass resolution mode (HR, M/ΔM ≈ 8000) under constant conditions were investigated and simulated in case of a multicollector-inductively coupled plasma mass spectrometer (MC-ICP-MS) using silicon enriched in 28Si as the main element in this survey. A drifting mass scale strongly impairs the precise and accurate determination of isotope ratios, depending especially on the peak/plateau width. For example, 29Si+ in Si highly enriched in 28Si has an extremely small mass plateau width of ΔM ≤ 4 × 10-3 u, compare ΔM(56Fe+) ≈ 18 × 10-3 u, which is to our knowledge one of the smallest plateaus routinely investigated in isotope ratio measurements, thus requiring extreme stability. During warm-up of the double-focusing sector field mass spectrometer, a mass drift up to ΔM/Δt ≥ 0.006 u/hr has been observed. Long-term studies on mass scale stability and simulations concerning fluctuations of the magnetic field B, acceleration voltage Uacc and ESA voltage UESA are reported. A change of one of these quantities of 0.01% induces changes of the mass scale of 6 × 10-3 u, 3 × 10-3u, and 1 × 10-3 u in the case of B, Uacc, and UESA, respectively. After identifying electrical charging/discharging effects in the mass spectrometer affecting the mass scale stability, the instrument was completely dismantled and carefully reinstalled. Additional stability tests using silicon, strontium, and lead finally yielded a mass drift of ΔM/Δt ≤ 0.001 u/8 h in the case of silicon. This enhanced stability guarantees measurements of isotope ratios on smallest plateaus with lowest uncertainty. The importance of a stable mass scale is pointed out and the relevant quantities of a typical magnetic sector field mass spectrometer are discussed. |
| Kostenfreier Zugang | Open Access Hybrid |
| Rechteinformation | CC BY 4.0 ; Creative Commons Attribution 4.0 License |
| Themenbereich der Metrologie | Metrologie in der Chemie und Stoffeigenschaften |
Zitierung
Pramann, A., Noordmann, J., & Rienitz, O. (2021). Investigation of mass-scale drift effects in the milli-mass range: Influence on high mass resolution mode multicollector-inductively coupled plasma mass spectrometer isotope ratio measurements. Journal of Mass Spectrometry, 56(6). https://doi.org/10.1002/jms.4732