help needed to improve GC/FID peak separation
Posted: Wed Jun 10, 2026 2:59 pm
Hi, I’m having trouble with peaks coeluting at the beginning of my GC/FID run. I’m using a Restek Rxi-5Sil MS, 20m column, 0.18mm diameter. Initial temp 50°C, max 320°C with 2 min hold. Rate 1: 20°C/min to 119°C, hold 1 min. Rate 2: 27°C/min to 300°C, hold 2 min. Split ratio 20:1, constant flow 1.2 mL/min, injecting 1µL. Any suggestions to improve efficiency or apps for adjusting parameters? I do want to include that the run must be around 15 min or so. any suggestions will be much appreciated.