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ASTM D5769 trouble with quadratic toluene calibration stability

Question asked by pantera69 on Jan 9, 2017
Latest reply on Sep 16, 2017 by james_jenkins

I have a toluene check standard that runs fine for a few weeks or so, then it runs about 1% high or low all of a sudden. All other compounds in the check don't have that problem. Any suggestions?