一种计算环境样品中石油类总量的红外标准曲线法

石油类是环境监测必测指标之一，主要以烃类形式存在，所以红外分光光度法是公认测定石油类总量最可靠的检测方法。红外分光光度法测定石油类总量目前有三波数的校正系数法和非色散的单波数标准曲线法。校正系数法计算步骤多、工作量大；单波数标准曲线法虽然简单，但是文献中有的未明确使用哪个波数进行计算，有的由于计算结果偏差较大而被限制适用范围或被直接舍弃。本文针对标准曲线法计算石油类总量的方法开展研究，通过三个波数处吸光度建立了5种标准曲线法，并对原油、高温润滑油、机油、0#柴油和92#汽油五种配制油品进行计算结果比对，确定了三波数吸光度之和标准曲线法是5种标准曲线法中的最佳方法。用芳香烃占比试验考察了油品适用范围，并进行了样品加标实验和实际样品实验验证其实用性，结果表明在芳香烃占比小于50%时。该方法精密度为5.9%~8.0%，加标回收率为76.4%~98.2%，满足环境标准要求。该方法拓展了标准曲线法的适用范围、简单易懂、操作性强，是现行校正系数法的有益补充。

An Infrared Standard Curve Method for Calculating the Total Amount of Petroleum in Environmental Samples

BACKGROUNDPetroleum oil is one of the necessary indicators for environmental monitoring, which mainly exists in the form of hydrocarbons. Therefore, infrared spectrophotometry is one of the most reliable methods to determine the total amount of petroleum oil. At present, there are two methods for the determination of petroleum by infrared spectrophotometry, which are the three-wave number correction coefficient method and the non-dispersive single wave number standard curve method. The correction coefficient method has many calculation steps and a heavy workload; the single wave number standard curve method does not specify which wave number to use for calculation or is abandoned due to the limited scope of application.