Demonstration of Selected Ion Flow Tube MS Detection in the Parts per Trillion Range

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• 作者：Daniel B. Milligan ; Gregory J. Francis ; Barry J. Prince ; Murray J. McEwan
• 刊名：Analytical Chemistry
• 出版年：2007
• 出版时间：March 15, 2007
• 年：2007
• 卷：79
• 期：6
• 页码：2537 - 2540
• 全文大小：127K
• 年卷期：v.79,no.6(March 15, 2007)
• ISSN：1520-6882

文摘

The rate coefficients of the ion-molecule reactions between H₃O⁺, NO⁺, O₂⁺, and phosphine were determinedusing a selected ion flow tube. Using these data, theselected ion flow tube mass spectrometry (SIFT-MS)method was applied to the real-time measurement ofphosphine in nitrogen without sample preparation downto concentrations in the mid parts per trillion range. Thisis the first reported measurement using SIFT-MS in theparts per trillion range. Linear dependencies on concentration were found from 190 ppt to the ppm range, andthe limit of detection for a 10-s scan was 190 ppt (0.27pg/mL).