Normal Mode - Agilent Technologies 7500 ICP-MS Operator's Manual

Agilent 7500 ICP-MS ChemStation Operator's Manual
Performing a Semiquantitative Analysis

Normal Mode

The Normal Mode is used when the ISTD is added to the unknown sample only.
This mode can also be used with Laser Ablation, where the matrix element is used
as the ISTD. The ISTD factor is calculated from the SemiQuant factor, so no
Internal Standard Data File is required for this mode.
The internal standard (ISTD) factor is calculated from the following equation:
ISTD factor = (SemiQuant Factor of ISTD) x (ISTD Concentration)
The concentration for each element is calculated using the following equation:
Conc. = (cps in sample) x (ISTD factor) x (dilution factor)
where the dilution factor is obtained from the Start Run panel if running a
method or in the Sample Log Table if running a sequence (default = 1.0); and the
SemiQuant factor is obtained from the SemiQuant parameters panel.
To set up internal standard correction, perform the following steps:
>>
1 Select SemiQuant
The Internal Standard Correction dialog box appears.
Internal Standard Correction Dialog Box
2 Select the Normal Mode button on the top of the dialog box if it is not already
selected.
3 Click the Internal Standard Correction check box on the top of the dialog box if
it is not already checked.
The Internal Standard Correction check box will be checked.
/ (SemiQuant factor)
Internal Standard Correction.
/ (cps of ISTD in the sample)
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