The residual concentration of DBT in

1 μL of sample was injected with a desmosome split ratio of 100:1. The temperature program was as follows: injection temperature – 250 °C, column temperature – 100 °C for zero min and increased to 300 °C at a ramping rate of 7 °C/min. The scanned mass range was from 50 to 1000 m/z and helium gas was used as a carrier gas.