Owner manual

5.6 Method Specifications
746 VA Trace Analyzer / 747 VA Stand
5-154
Parameter Range; Default value / Meaning
The proportionality factor is determined by means of a linear function
of type 0/linear, i.e. a straight line of type y = bx passed through the
origin, where
y: EV
a
/ EV
r
Ratio of the evaluation values of analyte
and reference substance
x: ρ
eff,a
/ ρ
eff,r
Ratio of the effective mass concentrations
of analyte and reference substance in the
analysis solution
b: Prop.fact. Proportionality factor
The curve "EV
a
/ EV
r
" vs "ρ
eff,a
/ ρ
eff,r
" is displayed and plotted.
0/linear
int.std.
Slope = Prop.fact.
0
0
Determinations with the aid of an internal standard are normally
programmed with the following basic structure:
:
D SMPL>M or SMPL/M Sample addition to measuring vessel
C (CAL Loop start for calibration
C CSOLN>M Addition of calibration solution to meas. vessel
RADD>M Addition of internal standard to meas. vessel
(REP Loop start for replication
SEGMENT Call-up of segment (with sweep)
ØMEAS Switch off voltage (solution change)
REP)n Loop end, n = number of replications
C RINSE Resetting of the volume bookkeeping to 0
C CAL)n Loop end, n = number of calibration solutions – 1
:
First, this program is used to record a calibration curve for determina-
tion of the proportionality factor. For this, the run mode on the
"MONITORING" page must be set to Run mode = calibration.
Instructions marked by D are ignored. Internal standard is added to
the calibration solutions (max. 10) in sequence and the measure-
ments performed.
To store the proportionality factor calculated from the calibration curve
permanently in the method, the method must then be copied from the
working memory into the method memory. This occurs automatically
with Auto.batch = on; an unsecured method with the same name in
the method memory will be overwritten.
The run mode is then switched to Run mode = determination. In-
structions marked by C are ignored. Internal standard is added to the
analysis solution and the measurement performed.
EV
a
/ EV
r
ρ
eff,a
/ ρ
eff,r