Metrohm 784 KFP Titrino - Manual (Page 136)

6.3 User methods
784 KFP Titrino
133
6.3.5 KF-titration with blank value subtraction "KF-Blank"
KF-titration regarding a blank value (e.g. for
an extraction solvent), being determined be-
fore and stored as common variable C38 (see
page 132). For work with a KF oven, you need
to enter an extraction time in key ,
">titration parameters".
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:
Sample size depending on expected con-
sumption of KF reagent.
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 %
– Sample size in g
– Factor for % (see page 134)
– Divisor (see page 134)
– Blank value in mL
– KF titer
'pa
784 KFP Titrino 784.0010
date 1999-08-18 time 18:04 0
KFT Ipol KF-Blank
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: all
limit smpl size: OFF
oven: no
activate pulse: OFF
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'fm
784 KFP Titrino 784.0010
date 1999-08-18 time 18:04 0
KFT Ipol KF-Blank
>calculations
Water=(EP1-C38)*C39*C01/C00/C02;2;%
Titer=C39;4;mg/ml
Blank=C38;4;ml
C00= 1.0
C01= 0.1
C02= 1
C38= 0.0
C39= 0.0
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