By Thomas on Tuesday, June 1, 2004 - 04:35 am:

I have come across a new impurity in one of our applications.

It seems to me as if it is a polymer, since I see m/z's with 44 and 54 in difference (e.g. 97-151-195-249-293 and so on)

I have other runs showing a different pattern (54-44-44-54-44 in difference).

I guess that the first pattern also could be a loss of 98?

Could there be any of you guys (or ladies) who have seen something like this (and knows what it is)?

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By JLSHEN2000 on Tuesday, June 1, 2004 - 06:48 am:

44 is usually associated with polyethylene (CH2CH2
O). I don't know what 54 is.

What source do you use? LC or GC?

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By Thomas on Tuesday, June 1, 2004 - 07:08 am:

I'm sorry, that I didn't state that. I'm using LC-MS (Agilent HP1100 single quad).

No, you're right. My problem is also figuring out what 54 is (or 98?).

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By Anonymous on Tuesday, June 1, 2004 - 07:33 am:

54=3H2O if this is possible