A-18
Agilent 7500 ICP-MS ChemStation Operator’s Manual
Appendix
5 log (y) = a (log x) + b
6 y = ax + b + bkg (Standard Addition)
where
: count of the background
7 y = ax +[blank]
where
: number of counts in the calibration blank
a
nx
i
y
i
loglog()w
i
i
∑
⎩⎭
⎨⎬
⎧⎫
x
i
w
i
log
i
∑
⎝⎠
⎜⎟
⎛⎞
y
i
w
i
log
i
∑
⎝⎠
⎜⎟
⎛⎞
–
nx
i
log()
2
w
i
i
∑
⎩⎭
⎨⎬
⎧⎫
x
i
w
i
log
i
∑
⎝⎠
⎜⎟
⎛⎞
2
–
------------------------------------------------------------------------------------------------------------------------=
b
y
i
w
i
log
i
∑
n
------------------------- a
x
i
w
i
log
i
∑
n
-------------------------
–=
a
nx
i
y
i
w
i
i
∑
⎝⎠
⎜⎟
⎛⎞
x
i
w
i
i
∑
⎝⎠
⎜⎟
⎛⎞
y
i
w
i
i
∑
⎝⎠
⎜⎟
⎛⎞
–
nx
i
2
w
i
i
∑
⎝⎠
⎜⎟
⎛⎞
x
i
w
i
i
∑
⎝⎠
⎜⎟
⎛⎞
2
–
---------------------------------------------------------------------------------=
b
y
i
w
i
i
∑
n
----------------- a
x
i
w
i
i
∑
n
-----------------
y
bkg
–=
y
bkg
a
x
i
y
i
Blk–()w
i
i
∑
x
i
2
w
i
i
∑
-----------------------------------------=
Blk