Tailing - chlorinated aromatics with phenol and aldehyde

[khirth]

All solutions were prepared in acetone.
Every injection was followed by a rinse injection of acetone.
WAX column.
Siltek single gooseneck, no packing
Standards contained all target analytes.
Sequence was bracketed with 10-point std.
Linear response, 0.999 or 0.998, depoending on analyte.
Peak shapes and responses remained very good.

The problem was, indeed, acetone was trashing the 5ms and 200ms columns FOR THESE ANALYTES, leaving the Grob components response same as when new. The WAX column was the solution.

Please see my yesterday's posting with Questions.

Any comments or further insights about the intrinsic differences of bonding of the siloxane vs PEG-type columns?

Any other "old wisdom" about solvents to avoid on particular phases?

And, any explanation as to why the acetone caused the observed effects?

Again, thanks!

[gcguy]

We perform an analysis for low level phenol content on one of our samples.
CP sil 13 25mx0.32mm using dichlomethane as the solvent and see no tailing.
I can give you more details if you require them.

GCguy