This application note describes some of the key points and advice for using the auto-backflush function on the Agilent 7890A/5975A GC/MS system, and provides an example of how to set up and use backflushing for monitoring biomarkers in crude oil.
The manual explains how to implement automatic column backflushing using the Agilent 7890A gas chromatograph and 5975A mass selective detector (MSD). It highlights that while backflushing was previously difficult due to complex hardware requirements, modern software versions like ChemStation E.01.00 allow for full electronic control of parameters.
The document provides a specific application example involving the analysis of crude oil biomarkers. It details the necessary hardware configuration using a split/purge inlet and restrictors, along with step-by-step instructions for setting up the method in software to reduce run times and extend column life. This manual is written in Japanese.
Benefits include increased samples per day, improved data quality, reduced operating costs, and extended column life.
A 1m x 0.18mm ID deactivated restrictor (Agilent part number 160-2615-1) was suitable for this application.