三维荧光光谱法鉴别原油指标的探讨

Discussion of the Characteristic Indexs in Using Three-Dimensional Fluorescence Method to Identify Different Crude Oils

研究了溶剂纯度对原油样品三维荧光光谱测试的影响,确定了溶剂使用前的纯化处理过程。在不引起样品荧光猝灭的浓度范围内,研究了原油浓度变化对特征峰位置、特征峰荧光强度F、特征峰荧光强度比值R等三维荧光图谱特征指标的影响。结果发现特征峰荧光强度F、特征峰荧光强度比值R受浓度影响较大,而相对峰强RS受浓度影响较小,且其数值随原油种类不同而有明显变化。文章提出了以RS值做为原油鉴别的新特征指标,并在5mg·mL-1的浓度条件下对大批不同产地的原油进行了鉴别实验。结果表明,该指标稳定、可靠,可应用于原油的快速鉴别。如与其他特征指标相结合,则可对原油作出进一步的准确鉴别。

The present paper investigates the influence of solvent purity on the test of three-dimensional fluorescence spectra,determines the process of its pre-purification,and studies the influence of the concentrations on the three-dimensional fluorescence characteristic indexes such as the characteristic peaks position,fluorescence intensity（F）,and ratio（R）of fluorescence intensity when the phenomena of fluorescence quenching won＇t appear.The result shows that the concentration affects the value F and value R largely but its effect on the relative peak intensity（RS）is relatively small.Different crude oils has different value RS.According to those characteristics,this paper presents that the value RS can be used as a new characteristic index for identification of crude oil.This conclusion was confirmed by testing many crude oils stably and reliably from different areas with their concentrations at 5 mg·L-1.This method can be applied to identify most crude oils preliminary and further accurate analysis can be carried out together with other index.