SH/T 0657-1998 Standard test method for trace nitrogen in liquid petroleum hydrocarbons by syringe/inlet oxidative combustion and chemiluminescence detection (English Version)
2007SH/T 0657-2007 Standard test method for trace nitrogen in liquid petroleum hydrocarbons by syringe/inlet oxidative combusaonand and chemiluminescence detection
1998SH/T 0657-1998 Standard test method for trace nitrogen in liquid petroleum hydrocarbons by syringe/inlet oxidative combustion and chemiluminescence detection