What might be the source of peak fronting that is visible on the Alliance 2695 but not on the Agilent 1100 or 1290? - WKB119278
Article number: 119278
ENVIRONMENT
- Alliance 2695
- Agilent 1100
- Agilent 1290
- Peak fronting
ANSWER
The way in which the injector needle is cleaned is different in the Alliance 2695 versus Agilent systems.
ADDITIONAL INFORMATION
The FTN of the Alliance 2695 has a needle purge feature and a separate wiper/frit wash. The needle purge wash is injected along with the sample. This should match the starting conditions of the mobile phase. If the mobile phase contains 30% organic but the needle purge wash is 50% organic, strong solvent effect would cause peak shape problems. The wiper/frit wash can be a stronger wash solution composition, because this only cleans the outside of the injector needle.
id119278, 2690, 2690D, 2690DUPGD, 2690UP, 2695, 2695D, 2695DE, 2695DEB, 2695DUP, 2695E, 2695EB, 2695INERT, 2695UP, A-10SSM, ALLCOLCLR, ALLCOLHTR, ALLCOLHTRB, eluent