样品（0.400 0 g）用甲苯溶解并定容至5.0 mL作为样品溶液，用于气相色谱法测定。选用TC-WAX毛细管柱为色谱分离柱，柱温条件为从50℃开始以6℃·min^-1速率升温至230℃，保持10 min，分流比为3：1。在此条件下可达到环戊二烯三聚体4种同分异构体的有效分离。用氢火焰离子化检测器检测，以外标法定量。上述4种同分异构体的质量浓度均在5.00~100 g·L^-1范围内与其对应的峰面积之间呈线性关系，检出限（3S/N）在2.0~2.5 mg·L^-1之间。用标准加入法进行回收试验，测得回收率在94.8%~106%之间，测定值的相对标准偏差（n=10）均不大于2%。

The sample (0.400 0 g) of trimeric cyclopentadiene (TCPD) was dissolved in and made its volume to 5.0 mL with toluene which was used as sample solution for GC determination of its 4 isomers. TC-WAX capillary column was selected for GC separation, and the 4 isomers were effectively separated under the following conditions:1 column temperature was elevated from the initial value of 50℃ to 230℃ at a rate of 6℃·min^-1 and kept for 10 min at this temperature; and 2 separation-flowing ratio of 3 to 1 was taken. Hydrogen flame ionization detector was used in the detection. External standard method was adopted for quantification. Linear relationships between values of peak areas and mass concentrations of the 4 isomers were found in the same range of 5.00-100 g·L^-1, with detection limits (3S/N) in the range of 2.0-2.5 mg·L^-1. Recovery was tested by standard addition method, giving values of recovery ranged from 94.8% to 106%, and RSDs (n=10) of the measured value were all less than 2%.