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GC contamination on Agilent 6890 - 2005/11/28 18:25
It sounds to me as if your clean stainless steel has become contaminated. It only takes one bad cylinder of gas. A fast way to check if it is contamination from the stainless steel gas supply tubing is to do the following. Hold your oven above 180 to establish a baseline. Then with matches or a lighter heat up the stainless steel column. Start close to the cylinder and work toward the GC. If there is anything in the column it will be carried to and through the column producing a large peak. If that happens your gas supplier at some time in the past, sent you a GC helium tank filled with party ballon grade helium. Do you use filters between your cylinder and injector? If you do, replace them. There are external multiple filter systems that have cartidges to remove water, oxygen and organic. Some are indicating for additional protection.
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