Metrohm 784 KFP Titrino - Manual (Page 133)

6.3 User methods
784 KFP Titrino
130
6.3.2 KF Titer determination with H
2
O or methanol standard
"H2OTiter"
The titer is calculated as mean value of 5 sin-
gle determinations and stored as common
variable C39. Therefore, it can be directly
used in subsequent methods.
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:
Distilled water, approx. 10 µ L or methanol
standard (5 or 10 mg water/mL).
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
– Result in mg/mL
– Sample size in g
– Factor
The factor depends on type and water content of
the standard:
Standard Sample
used size in Factor
water g 1000
water µ L density (H
2
O) = 1 g/mL
methanol g water content in mg/g
methanol mL water content in mg/mL
methanol µ L 0.001 ∗ water content
in mg/mL
C39 is the common variable for the titer
'pa
784 KFP Titrino 784.0010
date 1999-08-18 time 17:58 0
KFT Ipol H2OTiter
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= 5
res.tab: original
>preselections
conditioning: ON
display drift: ON
drift corr: OFF
req.ident: OFF
req.smpl size: value
limit smpl size: OFF
oven: no
activate pulse: OFF
------------
'fm
784 KFP Titrino 784.0010
date 1999-08-18 time 17:59 0
KFT Ipol H2OTiter
>calculations
Titer=C00/EP1*C01;4;mg/ml
C00= 1.0
C01= 1000
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'de
784 KFP Titrino 784.0010
date 1999-08-18 time 17:59
KFT Ipol H2OTiter
def
>formula
Titer=C00/EP1*C01
RS1 text Titer
RS1 decimal places 4
RS1 unit: mg/ml
RS1 limit control: OFF
>silo calculations
match id: OFF
>common variables
C39=MN1
>report
report COM1:full;
>mean
MN1=RS1
>temporary variables
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