Hellow I am analyzing the above molecule on 10% FFAP column for 4 meters length. I got sharp peak and analysis was satisfactory. I anazed over 130 samples of this compound and result was satisfactory.

CAS No.-16630-66-3

MF: - C4H8O2S

But right these days I am facing unusual problem. The reponce of compound is fed enough and high tailing was observed. I Flush the column and clean the injector and detector. But reponce was not good. I also swith over the direction of column(i.e Reverce direction) but same observation was observed.
I didn't under stand why it was happining suddnelly. Is this FFAP phase is not suitable for sulphur compound? or I lose my statioanry phase.
what exactaly was happned? I am quite sure the compound is suitable also for FFAP phase. But why I lose by retention and responce I still not understand. Any body please help me for this.

Regards

Praveen