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Application of Dynamic Reaction Cell - Inductively Coupled Plasma Mass Spectrometry for the Determination of Calcium by Isotope Dilution Method  

Suh, Jungkee (Division of Chemical Metrology and Materials Evaluation, Korea Research Institute of Standards and Science)
Yim, Yonghyeon (Division of Chemical Metrology and Materials Evaluation, Korea Research Institute of Standards and Science)
Hwang, Euijin (Division of Chemical Metrology and Materials Evaluation, Korea Research Institute of Standards and Science)
Lee, Sanghak (Department of Chemistry, Kyungpook National University)
Publication Information
Analytical Science and Technology / v.15, no.5, 2002 , pp. 417-426 More about this Journal
Abstract
Inductively Coupled Plasma Dynamic Reaction Cell Quadrupole Mass Spectrometry (ICP-DRC-QMS) was characterized for the detection of the six naturally occurring calcium isotopes. The effect of the operating conditions of the DRC system was studied to get the best signal-to-noise ratio. This experiment shows that the potentially interfering ions such as $Ar^+$, ${CO_2}^+$, ${NO_2}^+$, $CNO^+$ at the calcium masses m/z 40, 42, 43, 44 and 48 were removed by flowing $NH_3$ gas at the rate of 0.7 mL/min $NH_3$ as reactive cell gas in the DRC with a RPq value (rejection parameter) of 0.6. The limits of detection for $^{40}Ca$, $^{42}Ca$, $^{43}Ca$, $^{44}Ca$, and $^{48}Ca$ were 1, 29, 169, 34, and 15 pg/mL, respectively. This method was applied to the determination of calcium in synthetic food digest samples (CCQM-P13) provided by LGC for international comparison. The isotope dilution method was used for the determination of calcium in the samples. The uncertainty evaluation was performed according to the ISO/GUM and EURACHEM guidelines. The determined mean concentration and its expanded uncertainty of calcium was ($66.4{\pm}1.2$) mg/kg. In order to assess our method, two reference samples, Riverine Water reference sample (NRCC SLRS-3) and Trace Elements in Water reference sample (NIST SRM 1643d), were analyzed.
Keywords
dynamic reaction cell; calcium isotopes; isotope dilution method; expanded uncertainty; ICP-MS; NRCC SLRS-3; NIST SRM 1643d;
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