If I understand correctly, you are asking how you get access to the raw blank data in order to calculate the LOD and BEC using your own spreadsheet? The simplest way to do this will depend a little bit on how you want to calculate these figures and which version of software you are using, but the most common way would be to extract the replicate data for the blank, and calculate the LOD from 3 x the SD of the blank signal, expressed as a concentration.
To get right back to the raw count data, the easiest route in most versions of ChemStation is to use the function called "Edit Average File", which is under the "File" menu. This gives access to a worksheet for the currently file (i.e. the blank) which includes a tab labeled "Table" containing the cps for each replicate.
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From: PLASMACHEM-L: Analytical Chem.(ICP's, DCP's, MIP's). [mailto:[log in to unmask]] On Behalf Of Raśl Badini
Sent: 02 December 2010 13:40
To: [log in to unmask]
Because, the Seren (2 KW) RF generator in our X series (Thermo) got broken, we are using a borrowed an almost brand new Agilent 7500 from another Universitity Lab.
Software is OK in 7500 and give us LOD and BEC right away for example.
However, I failed to find out how exactly do that. It is mentioned in the Chem Station manual the well known formula but we do not know how to check that from our actual data blanks.
We normally do calculate LODs in a separate spreadsheet from the data got from our X Series Thermo ICPMS. I like this "automatic LOD" feature in 7500 software but I want to know exactly what am I doing.
Thanks in advance to those who can help me in this.
Dr. Raśl G. Badini
Santa Maria de Punilla