Blank Determination of Methanol with Potentiometric Method

Equipment
Potentiometer = 751 GPD Titrino / Titroprocessor
Electrodes = 6.0338.100 double Pt electrode; input Pol

Reagents
HYDRANAL® Composite 5; D0
Sample

20 -30 mL methanol, conditioned to complete dryness
1.000 mL methanol (extraction medium)

Remarks
Calculations:

Blank=EP1

Blank = blank of methanol (extraction medium)

Blank= 0.0145 mL

EP1 = 0.0145 mL

Common variables
C38 = MN1
Mean from 2-3 determinations.
This method can be generally used for KF blank determinations. For work with a KF Oven, you need an extraction time. Enter it in key , >titration parameters.

Use the same control parameters for the blank determination as for

the sample titrations.

For automatic curve output add in , >report “curve“.

Literature

Water determination by Karl Fisher titration, G. Wieland, GIT Verlag,Darmstadt (Germany)HYDRANAL®, practical course, Water reagents according to Eugen Scholz, Riedel de Haën, Seelze (Germany) Metrohm Application Bulletin No. 77: KF water determination

Method documentation

'pa
751 GPD Titrino 15215 751.0010
date 97-03-12 time 10:46 11
KFT Ipol Blank_KF
parameters
control parameters
EP at U 250 mV
dynamics 100 mV
max.rate max. ml/min
min.volume incr. min. ml
stop crit: drift
stop drift 20 ml/min
>titration parameters
titr.direction: -
pause 1 0 s
start V: OFF
pause 2 0 s
extr.time 0 s
dos.element: internal D0
I(pol) 50 mA
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
activate pulse: OFF
------------
'de
751 GPD Titrino 15215 751.0010
date 97-03-12 time 10:46
KFT Ipol Blank_KF
def
>formula

Blank=EP1

RS1 text Blank
RS1 decimal places 4
RS1 unit: ml
>silo calculations
match id: OFF
>common variables
C38=MN1
>report
report COM1:full;
>mean
MN1=RS1
>temporary variables
------------
'fr
751 GPD Titrino 15215 751.0010
date 97-03-12 time 10:45 11
KFT Ipol Blank_KF
EP1 0.0145 ml
Blank 0.0145 ml
mean( 2) +/-s s/%
Blank 0.0145 0.00000 ml 0.00
============
'cu
751 GPD Titrino 15215 751.0010
date 97-03-12 time 10:45 11
KFT IpolBlank_KF
2.0 s/div dV=0.05 ml/div
============
'st

751 GPD Titrino 15215 751.0010

date 97-03-12 time 10:46
statistics
## Blank
1 0.0145
2 0.0145
mean( 2) +/-s s/%
Blank 0.0145 0.00000 ml 0.00