Thanks to Fergus and Ed for their useful replies on and off the list.



2010/12/3 Keenan, Fergus <[log in to unmask]>

> Hi
> For PlasmaLab users there is a quick and simple way to set up a reusable
> template that will  automatically calculate IDLs if your test is based on
> some multiple of the blank's Standard Deviation (SD) for N replicate blank
> measurements (often N=10).
> Create up a new experiment with the elements you need DLs for using the
> acquisition parameters you would normally use (sweeps, dwell times etc).
> In your sample list you need a blank and a standard.
> Set up the N replicates you need for the blank under "the "main runs"
> column.
> Now input the multiplier you wish to use for the SD in the "User Dilution"
> column.
> When you run the experiment and view the results in the "Analyte Dilution
> Conc" tab the value in the SD row for the blank will be the calculated DL.
> If you want the experiment to report only the DL and no other information
> then there are two edits required:
> First, in the sample list UN-check the "Report" box for the Standard but
> leave the Blank checked.
> Second, in the "Results" tab click on the "Edit Display Filters"
>  button(that's the one that looks like a a funnel with a lightning bolt).
> This will open the "Display Parameters" window. In the "Sections Visible"
> area uncheck every parameter except "SD" and Click "OK" to close the window.
> Now the report will only display the DLs which you can copy and paste, print
> or export as csv.
> Finally save this experiment file as a Template - give it a name like IDL
> Test. Next time you want to estimate DLs all you need to do click on the
> relevant template icon, run the experiment and it will report just the DLs.
> If anyone needs help with this just drop me a note off-list.
> Fergus
> Fergus Keenan
> Thermo Fisher Scientific
> Field Marketing Manager
> Trace Chemical Analysis
> EMail: [log in to unmask]
> ________________________________________________________________
> -----Original Message-----
> 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]
> Subject: LODs
> Hi,
> 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.
> Regards
> Raul
> --
> Dr. Raśl G. Badini
> Santa Maria de Punilla
> Córdoba. Argentina

Dr. Raśl G. Badini
Santa Maria de Punilla
Córdoba. Argentina