期刊
ANALYTICAL CHEMISTRY
卷 82, 期 5, 页码 1949-1953出版社
AMER CHEMICAL SOC
DOI: 10.1021/ac9026912
关键词
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资金
- Natural Science Foundation of China
- National 863 program
- Fujian Province Department of Science and Technology
- Young Talent Project of Fujian Province [2008F3104]
- NFFTBS [J0630429]
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 die buffer gas at 250 Pa in the source chamber; the laser irradiance was about 7 x 10(10) W/cm(2). 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 grain level and a dynamic range of 6 orders of magnitude were achieved for most nonmetallic elements.
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