Mass-shift mode to quantify low level 129I in environmental samples by ICP-MS/MS

ERRATUM Mass-shift mode to quantify low level 129I in environmental samples by ICP-MS/MS (J. Anal. At. Spectrom. (2022) 37 (1309–1317) DOI: 10.1039/D2JA00128D)International audienceIn this study, a new measurement method to quantify 129I at low level by ICP-MS/MS (Agilent 8900) was developed. This new method is based on a new measurement medium and mass-shift mode. The developed measurement medium is composed of 0.1% NH4OH, 10 g L-1 ascorbic acid and 3% Tween® 20 which considerably decrease the memory effect and increase the sensitivity. Different reactional gas were compared on on-mass and mass-shift modes and finally, O2 was selected on mass-shift mode. The mass-shift mode with O2 allows having the most quantitative iodine oxidation rate while eliminating isobaric and polyatomic interferences. Isobaric interference due to 129Xe+ is eliminated following a charge transfer in the reaction/collision cell and polyatomic interferences are eliminated with the second quadrupole. This new measurement method improves the limit of detection of 129I to 11 mBq L-1, without chemical treatment