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The PMCS guide for the Shimadzu QP 2010+ states 69 should be the base peak. Why is the base peak 18?
Chromatography QP2010 GCMS
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Incorrect Base Peak
- A base peak of 18 when using the Shimadzu signifies that there is an abundant amount of water present in the system.
- This is common if the instrument has recently been placed under vacuum.
- The instrument needs 24-48 hours under vacuum to remove water from the system.
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Keywords: base peak, water, 18, 69, tune, auto, shimadzu, gc/ms, hydrogen, vacuum, leak