Electrolyte Concentration Calculation; Calculation Of Sl (Slope Value); Concentration Calculation Of Internal Standard Solution; Calculation Of Compensation Value (C.value) - Hitachi 902 Service Manual

9.4

Electrolyte Concentration Calculation

An example of Na calculation with use of the printout example on the previous page is
described here.

Calculation of SL (slope value)

−
E E
H L
SL =
C
H
log
C
L
− −
32 0 . ( . 39 6)
=
160
log
120
= 60.8
SL : Slope value
E : Electromotive force of HIGH solution (32.0)
H
E : Electromotive force of LOW solution (-39.6)
L
C : Concentration of HIGH solution (160.0)
H
C : Concentration of LOW solution (120.0)
L

Concentration calculation of internal standard solution

−
E I S E L
×
C = CL 10 SL
IS
−
35 4
×
= 120 0 10 .
= 140.7
C : Concentration of internal standard solution
IS
E : Electromotive force of internal standard solution (-35.4)
IS

Calculation of compensation value (C.VALUE)

The difference between the input value and measured value is obtained through measurement
of the Hitachi calibrator having the known concentration.
C.VALUE = C - C
c x
= 139.0 - 138.9
= 0.1
C : Input value (139.0)
c
C : Measured value (138.9)
x
− −
. ( 39 6 . )
60 8 .
9 - 13