Agilent Technologies 7500 ICP-MS User Manual

A-23
Agilent 7500 ICP-MS ChemStation Operator’s Manual
Appendix
Interpolation Formulas for Virtual-Internal-Standard Correction
These formulas are used to calculate the modification rates for all internal standards
used for the latest calibration curve and the current sample data. The concentration
level of the current data internal standards uses the value of level 1 of the calibration
curve, as with the existing internal-standard correction. In the case of “Linear” and
“Quadratic,” one formula is created from all internal-standard modification rates. In
the case of “Point to Point,” a formula is created for every two internal standards.
where
Cps_ci, Conc_ci: CPS and concentration of the internal standard
of the data last used to update the calibration
curve
Cps_si, Conc_si: CPS and concentration of the internal standard
of the current sample data (For the
concentration, use the value set for level 1 of
the calibration curve.)
Point to Point (Y = aX + b; Two adjacent internal standards are used; Default)
Linear (Y = aX + b; All internal standards are used.)
siConc
siCps
ciConc
ciCps
Ri
_
_
_
_
=
∑∑
∑∑∑
−
−
=
ii
iii
MiMin
RiMiMiRin
a
22
)(
n
Mi
a
n
Ri
b
ii
∑∑
−=
baMaRa +=

Agilent Technologies 7500 ICP-MS Specifications

General

Brand	Agilent Technologies
Model	7500 ICP-MS
Category	Laboratory Equipment
Language	English