该方法用于测定C15至C20单取代直链烷基苯中的异构体分布（实验室）。6-苯基十三烷和7-苯基十三烷异构体彼此不分离，被确定为复合物。单个组分的检测下限为0.1质量-%。除直链烷基苯以外的组分通常不通过该方法测定；但是，可以通过测量样品中除实验室外的成分来估计样品的实验室总含量。如果需要，还包括计算，以确定样品中实验室的数均分子量。

This method is for determining the isomer distribution in C15 through C20 mono-substituted linear alkylbenzenes (LABs). The 6-phenyltridecane and 7-phenyltridecane isomers are not resolved from each other and are determined as a composite. The lower limit of detection for a single component is 0.1 mass-%.Components other than linear alkylbenzenes are not normally determined by this method; however, an estimate of the total LAB content of the sample may be obtained by measuring the components present in the sample other than the LABs. A calculation is included to determine the number average molecular weight of the LABs in the sample, if needed.