激光电离正交飞行时间质谱法同时测定固体中的非金属元素。
Laser ionization orthogonal time-of-flight mass spectrometry for simultaneous determination of nonmetallic elements in solids.
机构信息
Key Laboratory of Analytical Science, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.
出版信息
Anal Chem. 2010 Mar 1;82(5):1949-53. doi: 10.1021/ac9026912.
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 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 gram level and a dynamic range of 6 orders of magnitude were achieved for most nonmetallic elements.
由于其物理和化学性质的差异，同时测定固体样品中的非金属元素是很困难的。我们开发了一种高辐照度激光电离正交飞行时间质谱（LI-O-TOFMS）系统，并将其应用于固体中非金属元素的测定。在源室中，氦气以 250 Pa 的缓冲气体使用；激光辐照度约为 7 x 10(10) W/cm(2)。使用了一系列含有 B、C、N、O、F、Si、P、S、Cl、As、Br、Se、I 和 Te 的人工标准品。只有很少的气体物种和双电荷基质离子的干扰，就可以得到明确的光谱。通过一种新的采样方法可以实现无标准的半定量分析，从而获得不同元素的近乎均匀的灵敏度系数。对于大多数非金属元素，检测限（LOD）达到微克/克水平，动态范围达到 6 个数量级。
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