Metrohm 784 KFP Titrino - Manual (Page 135)

6.3 User methods
784 KFP Titrino
132
6.3.4 Blank determination for KFT "Blank_KF"
This method can be generally used for KF
blank determinations. For work with a KF
oven, you need to enter an extraction time in
key , ">titration parameters".
The mean value out of 3 determinations is as-
signed to the common variable C38.
Electrode:
Double Pt-electrode 6.0338.100 at measuring
input "Pol".
Titrating agent:
One-component or two-component Karl-
Fischer reagent, ready to use.
Solvent:
20 mL Methanol or a specific solvent, condi-
tioned.
Sample:
E.g. 1.000 mL methanol (as used for extrac-
tion) or another solvent.
References:
G. Wieland, Water determination by Karl
Fischer Titration, GIT Verlag, Darmstadt, Ger-
many
HYDRANAL® Practical Course, Water rea-
gents for Karl-Fischer-Titration according to
Eugen Scholz, Riedel de Haën, Seelze, Ger-
many
METROHM Application Bulletin No. 77:
Karl Fischer Water Determinations
C38 is the common variable for the KF blank value.
'pa
784 KFP Titrino 784.0010
date 1999-08-18 time 18:01 0
KFT Ipol Blank_KF
parameters
>control parameters
EP at U 250 mV
dynamics 100 mV
max.rate max. ml/min
min.volume incr. min. µl
stop crit: drift
stop drift 20 µl/min
>titration parameters
titr.direction: -
pause 1 0 s
start V: OFF
pause 2 0 s
extr.time 0 s
I(pol) 50 µA
electrode test: OFF
temperature 25.0 °C
time interval 2 s
>stop conditions
stop V: abs.
stop V 99.99 ml
filling rate max. ml/min
>statistics
status: ON
mean n= 3
res.tab: original
>preselections
conditioning: ON
display drift: ON
drift corr: OFF
req.ident: OFF
req.smpl size: OFF
limit smpl size: OFF
oven: no
activate pulse: OFF
------------
'fm
784 KFP Titrino 784.0010
date 1999-08-18 time 18:01 0
KFT Ipol Blank_KF
>calculations
Blank=EP1;4;ml
------------
'de
784 KFP Titrino 784.0010
date 1999-08-18 time 18:02
KFT Ipol Blank_KF
def
>formula
Blank=EP1
RS1 text Blank
RS1 decimal places 4
RS1 unit: ml
RS1 limit control: OFF
>silo calculations
match id: OFF
>common variables
C38=MN1
>report
report COM1:full;
>mean
MN1=RS1
>temporary variables
------------