Metrohm 784 KFP Titrino - Manual (Page 134)

6.3 User methods
784 KFP Titrino
131
6.3.3 KF Titer determination with sodium tartrate "TarTiter"
The titer is calculated as mean value out of 5
single 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:
200–300 mg Disodium tartrate dihydrate
(water content 15.66 ±0.05%), stir to com-
plete dissolution.
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
– Water content of disodium tartrate dihydrate ∗ 10
If the sample size is given in mg, the factor is
0.1566.
C39 is the common variable for the titer
'pa
784 KFP Titrino 784.0010
date 1999-08-18 time 14:56 0
KFT Ipol TarTiter
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
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'fm
784 KFP Titrino 784.0010
date 1999-08-18 time 14:56 0
KFT Ipol TarTiter
>calculations
Titer=C00/EP1*C01;4;mg/ml
C00= 1.0
C01= 156.6
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'de
784 KFP Titrino 784.0010
date 1999-08-18 time 14:56
KFT Ipol TarTiter
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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