燃油拉曼光谱荧光干扰成因及处理方法

The Cause and Treatment Method for Raman Spectroscopy Fluorescence Interference of Fuel

根据燃油的组成结构及其拉曼光谱特征,提出了一种采用石墨化炭黑对油样进行前处理以去除燃油拉曼荧光背景干扰的方法。通过对过滤吸附处理前后油样的拉曼光谱和GC-MS试验结果进行对比分析,验证了该方法的有效性,并得出燃油中产生荧光的物质主要是菲、蒽、芘衍生物等多环(三环及以上)芳烃类和含硫、氮杂原子芳香烃类物质,且均能够被有效过滤吸附,对燃油的拉曼光谱特征影响较小。

According to the structural features and the Raman spectroscopy characteristics of fuel, a treatment method for fuel to remove Raman fluorescence background by means of the graphitized carbon black(GCB) was put forward in this article. Comparing the Raman spectroscopy and GC-MS analysis results of both untreated samples and the corresponding filtering adsorption processed fuel samples by GCB, the proposed novel pretreatment method was proved effective. The conclusion is reached that the main substances in the fuel resulting in fluorescence are the derivants of phenanthrene, anthracene, pyrene and other polycyclic aromatic hydrocarbon(tricyclic and above) and sulfur, nitrogen hetero atoms aromatic hydrocarbon compounds, which can be effectively dealt with by GCB as well as little influence on Raman spectroscopy characteristics of fuel.