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- Posts: 2
- Joined: Thu Oct 06, 2016 5:20 pm
We are new in LC-MS. We purchased one Agilent LC-MS, single QUAD with ESI.
The mobile phase is 0.1M ammonium acetate at pH 5.4. The column is Dionex Aclaim Surfactant column. We try to understand the chemical identities for M/Z at 348.1 (small peaks at 349.1, 347.2 and 350.1) and 290.1 (small peaks at 291.0, 292.1) at positive mode. There are other small peaks at 276.1, 312.1, 543.2 and 619.2. These M/Z species are present at background all the time. It does not affect any of our analysis, just very curious. Appreciate if anyone can shed some light on this.
Thanks, Ophelia