FAQ - Frequently Asked Questions

(AA) Replacing the Graphite Tube (GFA-7800/7000)

 

When the same graphite tube is reheated many times, its surface oxidizes and becomes rough. Moreover, as oxidation continues, the graphite tube wall becomes thinner in the vicinity of the injection hole, and the tube will finally bend and break. As wear in the tube due to oxidation progresses, reproducibility of the data declines and in some cases the absorption peak may not appear. In those cases, replace the graphite tube.