250 padd>m, O, s, M, a – Metrohm 746 VA Trace Analyzer User Manual
Page 401
5.7 Program instructions
746 VA Trace Analyzer / 747 VA Stand
5-250
PADD>M
Page:
O, S
Stand:
M, A
Abbreviation:
P
Instructions t/s Main parameters Auxiliary parameters
––––––––––––– ––––– ––––––––––––––––––––––––– –––––––––––––––––––––––––
## .. PADD>M ..... Soln.name ........ Prop.coeff. ........
Prop.subst. ........
Function
Dispense standard addition solution proportional to the measured
evaluation value
EV:
of a substance into the measuring vessel
(MEAS).
Parameter
Range; Default value / Meaning
Soln.name
8 characters; -
Name of the standard addition solution
The name of the standard addition solution must be identical to the
name entered on the "SUBSTANCES/Calibration" page under
Soln.name
(see section 5.6.3). The mass concentration of the standard
addition solution
Mass conc.
must also be entered on this page.
If the standard addition solution should be added automatically using a
685 Dosimat, a 700 Dosino or 695 Autosampler, the solution name
Soln.name
must be entered in the parameter of the same name on the
"SOLUTIONS" page and assigned to a position
Pos.
(see section
5.3.4).
Without entry of this name on the "SOLUTIONS" page or without a
position assignment, the standard addition solution must be added
manually or with the 6.5611.010 Pipetting equipment (the prompt
ADD
"Soln.name" "V.add" > M
appears in the program run with the calcu-
lated standard addition volume being displayed for
V.add
in
µ
L).
Prop.subst.
8 characters; -
Name of the reference substance for proportional standard
addition
Here, the name of the substance whose evaluation value
EV:
(in A, W or s) is the basis for the proportional standard addition must be
entered. This can be the analyte or one of the 7 other possible sub-
stances.
The name of the substance must be identical to one of the substance
names entered on the "SUBSTANCES/Calibration" page (see section
5.6.3).
Prop.coeff.
0.0010...99999.9; 1
Proportionality coefficient
The proportionality coefficient defines the relation between the meas-
ured mean value of the evaluation value
EV:
and the standard
addition volume
V.add
:
V.add = EV:
Depending on the unit of the evaluation value
EV:
(nA, nW or
s), the proportionality coefficient has the unit
µ
L/nA,
µ
L/nW or
µ
L/s
giving a calculated standard addition volume
V.add
in
µ
L.