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Agilent 7500 ICP-MS ChemStation Operator's Manual
Appendix
where
Mi : Mass number of internal standards
n : Number of internal standards (two in the case of "Point to Point")
Ri : Modification rate of the internal-standard CPS between the
Ma : Mass number of the element to be quantitatively analyzed
Ra : Virtual-internal-standard correction coefficient for
2
Quadratic (Y = aX
+ bX + c; All internal standards are used.)
−
S
S
S
2
(
MM
)
=
(
M
R
)
a
−
S
S
2
2
(
MM
)
(
M
M
)
−
S
S
(
MR
)
2
2
=
(
M
M
)
b
S
S
(
MM
)
2
2
(
M
M
)
∑
∑
Ri
Mi
=
−
i
i
c
b
n
n
=
+
Ra
aMaMa
bMa
where
Mi : Mass number of internal standards
n : Number of internal standards
Ri : Modification rate of the internal-standard CPS between the
Ma : Mass number of the element to be quantitatively analyzed
Ra : Virtual-internal-standard correction coefficient for correcting
A-24
standard data and sample data
correcting the CPS of the element to be quantitatively
analyzed
S
(
MR
)
2
(
MM
)
2
{
S
}
2
(
MM
)
S
S
2
2
(
M
R
)
(
MM
)
−
2
{
S
}
2
(
MM
)
∑
2
Mi
−
a
n
+
c
standard data and sample data
the CPS of the element to be quantitatively analyzed
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