Chromatography Forum

I am new to carbonyl analysis and I have a problem with Acetone splitting. I have 2 instruments; on one instrument, the peak does not split, but is broad...on the other instrument, the peak splits enough to manually split it. I'm fairly certain that the peak should not be splitting or be broad, but don't know how to fix the problem. It only shows up at very low concetrations. It may be the cartridges, however, I have never had a problem with them before.
Any ideas are welcome.
THANKS!!

At the risk of sounding like a curmudgeon (which I am, but I don't want to sound like one! ). So, please accept my apologies if this sounds rude:

1. Have you searched the Forum? There are some 60,000 posts here, and at least 78 of them mention "splitting". The "Search" function is near the upper left of your screen, just under the "Chromatography Forum" logo.

2. "The devil is in the details". As far as I know, there are no mind readers frequenting the Forum. Without knowing details about what you are doing, no one can give you meaningful advice. Useful information would include:
- what column packing (specific type and manufacturer)
- what mobile phase
- what column dimensions
- what flow rate
- what kind of sample
- what is that sample dissolved in
- what injection volume