Agilent Technologies 7500 ICP-MS Operator's Manual page 634

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