FW: HAWK-POPI Comparison-4
Efremov Sergei
From: Jones, Peter J [mailto:peter...@aramco.com]
Sent: Tuesday, February 05, 2013 6:40 PM
To: David Weldon
Cc: Efremov Sergei; Jones_...@yahoo.com; Qathami, Salman M
Subject: HAWK-POPI Comparison-4
Attached are two tables, one compares the data for sample 35 and 35 from the HAWK with the Weatherford instrument data.
It is very nice to see that the Total Hydrocarbons (THC) for POPI-GU1 and HAWK are very similar. We also see very similar numbers to the individual values of LV, TD, TC, the ratio TD/TC, and Tmin. Based on what I see here, we should be able to run ALL samples with these parameters and be able to feel confident in our testing results.
The only thing we need to address is the correct generation of the *.csv file. Upon looking at the data in greater depth, the only problem that appears to be present in the generation of the *.csv file is the use of a value of “0” for the beginning time-step, instead of using a value that is indicative of the background signal response. That is, the signal for this example should be something like 59.35104 for the zero time step. By having the “0” value at the beginning time step, GC-ROX assumes all signal over “0” should be integrated in calculating yields, thereby, making all calculations under reprocessing incorrect.
With the Legacy POPI equipment, we also have problems when the area under where a baseline becomes large, it is just not seen that often. However, baselining all samples consistently would improve results.
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For example, here a pyrogram from the GC-ROX manual edit module which could be improved with a better baseline:
Thus, addressing this will be important going forward.
Not knowing the process completely, I may get some details wrong, but what we want is the *.csv file to reflect values that are the same as the integrated result of signal – baseline used to calculate the yield. So, the CSV should either be baselined, or should have the baseline value for GC-ROX to use, or the import/QC process should baseline these correctly. When we made GC-ROX, we did not have all the details because of Weatherford, but now we should be able to get this right.
Also attached, please find an Excel spreadsheet for all the data from the F-Well.
Best regards,
Pete
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