GC-MS-based PAHs, C2-DBF and hopane ratio in the uppermost Permian Changxing Fm. in the Meishan C section

The non-polar fraction of toluene:MeOH (9:1) extracted sediment samples was analyzed by GC-MS on an Agilent gas chromatograph (GC, 6890) interfaced with an Agilent 5975 mass selective detection (MSD) instrument. A DB-5MS column (60 m × 250 μm × 0.25 μm) was installed with the GC oven. The temperature program was: isothermally at 40 °C for 2 min, ramped to 320 °C at a rate of 4°/min, and then held at this temperature for 22 min.以甲苯与甲醇体积比9:1的混合溶剂萃取沉积物样品所得到的非极性馏分，通过搭载安捷伦5975型质谱选择性检测器（Mass Selective Detector, MSD）的安捷伦6890型气相色谱仪（Gas Chromatograph, GC），采用气相色谱-质谱联用（Gas Chromatography-Mass Spectrometry, GC-MS）技术完成分析。气相色谱炉内安装有DB-5MS毛细管柱（规格为60 m × 250 μm × 0.25 μm）。色谱炉程序升温条件如下：于40℃恒温保持2 min，以4℃/min的升温速率升至320℃，随后在此温度下维持22 min。