This document introduces the retention time reproducibility of Agilent 6890 Plus GC. Agilent Technologies tested a large number of 6890 Plus GCs. The results showed that a given peak typically fell within a very tight range of 0.002 to 0.003 min. The average standard deviation for all GCs tested was 0.001 min. This represents a relative standard deviation of less than 0.02 percent.
Agilent Technologies tested thirty-two 6890 Plus gas chromatographs over a 10-month period to characterize their analytical performance regarding retention time reproducibility. The study utilized a sequence of ten automated runs on each instrument using a hydrocarbon check-out sample and an Agilent 3396C integrator for data acquisition.
The results indicate that the electronic pneumatics control with real-time ambient pressure- and temperature-compensation significantly improves stability. For the C16 peak, retention times typically fell within a narrow range of 0.002 to 0.003 minutes. The average standard deviation across all tested GCs was 0.001 minute, representing a relative standard deviation (RSD) of less than 0.02 percent.
A given peak typically falls within a very tight range of 0.002 to 0.003 min.
The average standard deviation for all GCs tested was 0.001 min.
Thirty-two 6890 Plus GCs were randomly selected from Agilent's production line.