Issue 5, 2018

Low level determination of gallium isotopes by ICP-QQQ

Abstract

Determination of low concentrations of Ga in environmental or biological samples can benefit from interference free measurement of both Ga isotopes. Unfortunately, both isotopes have potential interferences, i.e. doubly charged Ba at m/z 69 and MnO at 71. Analysis using collision and reaction gases by ICP-QQQ as an alternative to HR-ICP-MS is investigated here using conventional nebulization and a desolvating nebulizer. Analysis at m/z 71 is not appreciably affected by MnO at 200 μg l−1 Mn or in either water reference material; excellent detection limits of <0.1 ng l−1 were obtained for He, H2, or on-mass O2 and NH3 gas modes. Analysis of Ga at m/z 69 was severely affected by doubly charged Ba across all gas modes except +17 mass-shift (i.e. 69–86) NH3 gas mode. Despite Ga being only 1–2% reactive at the 69–86 mass shift, the doubly-charged interference was not mass-shifted and detection limits of <1 ng l−1 and precise and accurate quantification of two water reference materials and nine natural water samples were achievable for this analysis mode.

Graphical abstract: Low level determination of gallium isotopes by ICP-QQQ

Article information

Article type
Technical Note
Submitted
14 Mar 2018
Accepted
17 Apr 2018
First published
17 Apr 2018

J. Anal. At. Spectrom., 2018,33, 897-900

Low level determination of gallium isotopes by ICP-QQQ

B. P. Jackson, J. Anal. At. Spectrom., 2018, 33, 897 DOI: 10.1039/C8JA00073E

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