Metrohm 746 VA Trace Analyzer User Manual
Page 295
5.6 Method Specifications
746 VA Trace Analyzer / 747 VA Stand
5-144
Parameter
Range; Default value / Meaning
Curve type
linear, nonlin; linear
Curve type for standard addition
The measured values obtained in the standard addition can be
evaluated with a linear or a non-linear function (see also section
6.9.4):
linear
Straight line of type y = bx
Calculation by weighted linear regression
y:
EV
Evaluation value (A, W or s)
x:
ρ
eff
Effective mass concentration in the
analysis solution
b:
Slope
Slope of the line
Y.reg
Estimated
EV
value for sample con-
centration
ρ
eff,s
Y.reg
Slope
0
0
EV
ρρ
eff
eff
std.add., linear
nonlin
Curve of type y = bx + cx
4
Calculation by weighted curve matching
y:
EV
Evaluation value (A, W or s)
x:
ρ
eff
Effective mass concentration in the
analysis solution
b:
Slope
Slope of the line in the linear region
c:
Nonlin.
Non-linearity factor
Y.reg
Estimated
EV
value for sample con-
centration
ρ
eff,s
Slope
Y.reg
0
0
EV
ρρ
eff
eff
std.add., nonlin
1
st
standard addition
2
nd
standard addition
3
rd
standard addition
Sample
3
rd
standard addition
2
nd
standard addition
1
st
standard addition
Sample