Clark Adrian G, Thurbide Kevin B
Department of Chemistry, University of Calgary, Calgary, Alberta T2N 1N4, Canada.
Department of Chemistry, University of Calgary, Calgary, Alberta T2N 1N4, Canada.
J Chromatogr A. 2015 Nov 20;1421:154-61. doi: 10.1016/j.chroma.2015.04.007. Epub 2015 Apr 11.
An improved multiple flame photometric detector (mFPD) is introduced, based upon interconnecting fluidic channels within a planar stainless steel (SS) plate. Relative to the previous quartz tube mFPD prototype, the SS mFPD provides a 50% reduction in background emission levels, an orthogonal analytical flame, and easier more sensitive operation. As a result, sulfur response in the SS mFPD spans 4 orders of magnitude, yields a minimum detectable limit near 9×10(-12)gS/s, and has a selectivity approaching 10(4) over carbon. The device also exhibits exceptionally large resistance to hydrocarbon response quenching. Additionally, the SS mFPD uniquely allows analyte emission monitoring in the multiple worker flames for the first time. The findings suggest that this mode can potentially further improve upon the analytical flame response of sulfur (both linear HSO, and quadratic S2) and also phosphorus. Of note, the latter is nearly 20-fold stronger in S/N in the collective worker flames response and provides 6 orders of linearity with a detection limit of about 2.0×10(-13)gP/s. Overall, the results indicate that this new SS design notably improves the analytical performance of the mFPD and can provide a versatile and beneficial monitoring tool for gas chromatography.
本文介绍了一种改进的多火焰光度检测器（mFPD），它基于平面不锈钢（SS）板内的互连流体通道。相对于之前的石英管mFPD原型，SS mFPD的背景发射水平降低了50%，具有正交分析火焰，操作更简便、更灵敏。因此，SS mFPD中的硫响应跨越4个数量级，最低检测限接近9×10(-12)gS/s，对碳的选择性接近10(4)。该装置还对烃类响应猝灭具有极高的抗性。此外，SS mFPD首次独特地允许在多个工作火焰中监测分析物发射。研究结果表明，这种模式可能会进一步改善硫（线性HSO和二次S2）以及磷的分析火焰响应。值得注意的是，后者在多个工作火焰响应中的信噪比提高了近20倍，线性范围为6个数量级，检测限约为2.0×10(-13)gP/s。总体而言，结果表明这种新的SS设计显著提高了mFPD的分析性能，可为气相色谱提供一种通用且有益的监测工具。
