Contamination, Peak at m/z 100
Posted: Sat Jul 24, 2010 2:02 am
I am curious about a peak I am seeing at m/z 100, ionspray, positive ion mode on an API-III.
I looked at a table I found on common background ions to see if I could find a good candidate. I could not.
The front end, orifice, behind curtain plate, Q0 through to end of Q1 were recently cleaned to remove high background signal. The background improved significantly but I was left with a huge peak at m/z 100.
I was infusing 75/25 methanol /0.1% formic acid in type one water at the time I noticed the peak. The peak remained when I switched to ACN/0.1% formic acid in type one water. The intensity is in the millions. It is BIG.
I am curious what it could be coming from. I suspect one of the solvents used to clean with, the plastic containers I used for holding the solvents (polypropylene) or the latex gloves.
Any ideas?
Alp
I looked at a table I found on common background ions to see if I could find a good candidate. I could not.
The front end, orifice, behind curtain plate, Q0 through to end of Q1 were recently cleaned to remove high background signal. The background improved significantly but I was left with a huge peak at m/z 100.
I was infusing 75/25 methanol /0.1% formic acid in type one water at the time I noticed the peak. The peak remained when I switched to ACN/0.1% formic acid in type one water. The intensity is in the millions. It is BIG.
I am curious what it could be coming from. I suspect one of the solvents used to clean with, the plastic containers I used for holding the solvents (polypropylene) or the latex gloves.
Any ideas?
Alp