QUANTITATION OF COAL & DIESEL SOOT BY HIGH FREQUENCY EPR

迫切需要定量的实验方法 来分析柴油机烟灰和煤的颗粒混合物。 混合煤 来自机械的带有柴油烟灰的粉尘通常在采矿过程中形成， 形成一个极其危险的环境。 由于煤炭和 柴油机碳烟中含有自由基，EPR可用于此类分析 混合物。 我们曾以下列例子探讨生产者延伸责任的方法： 柴油烟灰（样品I），IBC-101（Illinois#6）煤（样品II），和 他们的混合物。 在X波段（9.5 GHz），两个样品都具有单线EPR g值仅略有不同的光谱：（gI-gII）v10-3。 因此，来自煤-烟灰混合物的EPR信号不能揭示 存在两种激进类型之间的差异。 相比之下，在W波段 频率（94.5 GHz），g值分辨率增加了一个因子 这使我们能够将EPR信号从不同的 混合物组分 研究结果为开发一种新的 一种灵敏、快速、可靠的煤/烟灰分析方法 基于高频EPR光谱的混合物。 这有潜力 应用于职业和环境健康与安全。

There is an urgent need for quantitative experimental methodology to analyze diesel soot-coal particulate mixtures. Mixtures of coal dust with diesel soot from machinery are often formed during mining, creating an extremely hazardous environment. Since both coal and diesel soot contain free radicals, EPR can be used in analysis of such mixtures. We have explored the EPR methodology using as examples a diesel soot (sample I), an IBC-101 (Illinois #6) coal (sample II), and their mixtures. At X-band (9.5 GHz) both samples have single-line EPR spectra with only slightly different g-values: (gI-gII)v10-3. Therefore, the EPR signal from a coal-soot mixture cannot reveal the difference between two radical types present. In contrast, at W-band frequencies (94.5 GHz) the g-value resolution is increased by a factor of 10, and this allows us to separate the EPR signals from different mixture components. The results provide a basis for development of a sensitive, quick, and reliable method for an alysis of coal/soot mixtures based on high frequency EPR spectroscopy. This has potential applications to occupational and environmental health and safety.