Determination of ultra-low 236U/238U isotope ratios by tandem quadrupole ICP-MS/MS

Abstract

Isotope ratios of 236 U/ 238 U were measured at levels below 10 À7 by single collector ICPMS with a tandem quadrupole mass separation mechanism. Peak tailing of the prominent 238 U + ion beam on the 236 U + peak was reduced to the level of $10 À10 by use of two quadrupole mass filters. The 235 UH + interference on 236 U + was efficiently reduced to a UH + /U + ratio of 1 Â 10 À8 by an ion-molecule reaction between UH + and O 2 in a collision/reaction cell placed between the two quadrupoles. The resultant detection limit for 236 U/ 238 U measurement was better than those reported by any other ICPMS study. The 236 U/ 238 U ratios, measured as 236 U 16 O + / 238 U 16 O + , were determined in the range 10 À9 to 10 À7 without correction for spectral interference. Accurate measurements of 236 U/ 238 U to as low as 1 Â 10 À10 are projected.

Reconstruction of uranium and plutonium isotopic signatures in sediment accumulated in the Mano Dam reservoir, Japan, before and after the Fukushima nuclear accident

“…Precise 236U measurements were performed twice in two different laboratories: at CEA/LANIE ("Commissariat à l'Energie Atomique et aux Energies Alternatives/ Laboratoire de développement Analytique Nucléaire, Isotopique, Elémentaire") and at IRSN/LELI ("Institut de Radioprotection et de Sureté du Nucléaire / Laboratoire sur le devenir des pollutions des sites radioactifs") using two ICP-MS/MS (Agilent 8800, Agilent Technologies, Tokyo, Japan) instruments well-suited for the measurement of extremely low 236U/238U isotope ratios (Tanimizu et al, 2013;Yang et al, 2016). Two analyses on each sample were conducted to provide more confidence in the results.…”

A novel strategy to determine As, Cr, Hg and V in drinking water by ICP-MS/MS

“…Probably it is due to the formation of the 35 Cl 16 3 , both dioxide ions were selected in Q2 causing the positive interference. Probably it is due to the formation of the 35 Cl 16 3 , both dioxide ions were selected in Q2 causing the positive interference.…”

“…The authors emphasized the need for CRI, once matrix matching calibration and ICP-MS operation in standard mode did not suffice to improve the accuracy, especially in ammonium acetate medium. 16,17 Arsenic and selenium at ultratrace levels were determined as AsCH 2 + and SeCH 2 + employing CH 3 F/He as a reaction gas in ICP-MS/MS. These pressurized cells are located before the quadrupole analyzer and gases such as O 2 , NH 3 and H 2 are introduced into the cell promoting collision or reaction processes.…”

Input ion optics of inductively coupled plasma quadrupole mass spectrometers. Part II. Asymmetrical systems with parallel (off-axis) shift of ions

“…При этом количество и имя направляемых в ORS и далее в главный масс-анализатор разновидностей ионов задают указа-нием индивидуальных величин или диапазона их масс в Q1 и Q2: от одной до множества. Накоплен-ный к настоящему времени двухлетний опыт разно-образного применения Agilent 8800 ICP-QQQ опу-бликован в [129][130][131][132][133][134][135][136][137][138][139][140][141][142][143][144][145][146][147].…”