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July 19, 2012
There could be many reasons for this. Here are a few of the most common possibilities:
1. Small differences may simply be due to rounding error if a different number of decimal places was used for component amounts or any of the physical properties or factors used in the calculation.
2. If the results were calculated from a different chromatography run, then small differences are expected. The GPA publishes acceptable repeatability limits (same sample analyzed in the same lab) and reproducibility limits (same sample analyzed in a different lab). In addition, if the samples were taken at different times from a flowing source like a well, then it is expected that results will vary from sample to sample.
3. You are using a different set of physical properties in EZReporter than were used previously. The GPA updates the physical properties used in the calculations from time to time. The last update was in early 2010 when the GPA 2145-09 standard was published. Unless you are using identical physical properties, the calculated results will likely be different.
4. You are using a different base pressure in the calculations. This can have a significant impact on the “Real” results, which are corrected for base pressure.
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