Laser Ionization Orthogonal Time-of-Flight Mass Spectrometry for Simultaneous Determination of Nonmetallic Elements in Solids

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• 作者：Lingfeng Li ; Bochao Zhang ; Rongfu Huang ; Wei Hang ; Jian He ; Benli Huang
• 刊名：Analytical Chemistry
• 出版年：2010
• 出版时间：March 1, 2010
• 年：2010
• 卷：82
• 期：5
• 页码：1949-1953
• 全文大小：201K
• 年卷期：v.82,no.5(March 1, 2010)
• ISSN：1520-6882

文摘

The simultaneous determination of nonmetallic elements in solid samples is difficult owing to their discrepant physical and chemical properties. We developed a high-irradiance laser ionization orthogonal time-of-flight mass spectrometry (LI-O-TOFMS) system and applied it for the determination of nonmetallic elements in solids. Helium was used as the buffer gas at 250 Pa in the source chamber; the laser irradiance was about 7 × 10¹⁰ W/cm². A series of artificial standards containing B, C, N, O, F, Si, P, S, Cl, As, Br, Se, I, and Te were used. Explicit spectra were obtained with only a little interference from gas species and doubly charged matrix ions. Standardless semiquantitative analysis could be accomplished with a novel sampling methodology to obtain near-uniform sensitivity coefficients for different elements. Limits of detection (LOD) at microgram per gram level and a dynamic range of 6 orders of magnitude were achieved for most nonmetallic elements.