Journal
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
Volume 282, Issue 1, Pages 309-313Publisher
SPRINGER
DOI: 10.1007/s10967-009-0227-z
Keywords
Isotope ratio; Cesium; Environmental; Chromatography; Gamma spectrometry; Quadrupole; ICP-MS
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The measurement of fission product cesium isotopes Cs-135 and Cs-137 at low femtogram (fg) 10(-15) levels in ground water by Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) is reported. To eliminate the natural barium isobaric interference on the cesium isotopes, in-line chromatographic separation of the cesium from barium was performed followed by high sensitivity ICP-MS analysis. A high efficiency desolvating nebulizer system was employed to maximize ICP-MS sensitivity similar to 10 cps/fg. The three sigma detection limit for Cs-135 was 2 fg/mL (0.1 mu Bq/mL) and for Cs-137 0.9 fg/mL (0.0027 Bq/mL) measured from the standard with analysis time of less than 30 min/sample. Cesium detection and 135/137 isotope ratio measurement at very low femtogram levels using this method in a spiked ground water matrix is also demonstrated.
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