Buchi KjelSampler K-377 Uživatelský manuál Strana 27

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3 Technical data
27
K-375/376/377 Operation Manual, Version B
Measuring input: pH/mV input with 12 bit transducer for accurate resolution during the titration
Connection:
electrode socket according to DIN 19 262 or BNC socket and reference electrode 1 x 4 mm socket
Measuring range Display resolution Accuracy* without sensor Input resistance ()
pH 0…14 0.01 0.05 ±1 digit > 5·10
12
mV –1400 ... +1400 0.1 2 ±1 digit > 5·10
12
Measuring range Display resolution Accuracy* without sensor
T [°C] 30…115 0,1 0,5 K ±1 digit
*Accuracy:
Indicated in terms of measuring incertainty with a confidence of 95%. In addition the measuring uncer-
tainty of the sensor has to be taken into account as well. For pH electrodes e.g.: pH= 0.012...0.03
according to DIN 19 266, Part 3.
3.3 Titration solution
The amount of sample and the concentration of the titrant should be optimized, so that the titrant
volume is between 3 and 17 mL (buret volume: 20 mL).
Table 3-16: Nitrogen expected
N-amount N-content Sample size Titrant Titrant concentration Titrant volume
5 mg N 0.5 % N 1 g
H2SO4 0.01 mol/L
17.8 mL
50 mg N 5 % N 1 g
H2SO4 0.1 mol/L
17.8 mL
100 mg N 10 % N 1 g
H2SO4 0.25 mol/L
14.3 mL
100 mg N 10 % N 1 g
H2SO4 0.5 mol/L
7.1 mL
200 mg N 20 % N 1 g
H2SO4 0.5 mol/L
14.3 mL
200 mg N 20 % N 1 g
H2SO4 1 mol/L
7.1 mL
Table 3-17: Protein expected
P-content P-factor N-content Sample size Titrant Titrant concentration Titrant volume
1 % P 6.25 0.16 % N 2 g
H2SO4 0.01 mol/L
11.4 mL
2 % P 6.25 0.32 % N 1 g
H2SO4 0.01 mol/L
11.4 mL
5 % P 6.25 0.80 % N 2 g
H2SO4 0.1 mol/L
5.7 mL
10 % P 6.25 1.6 % N 2 g
H2SO4 0.1 mol/L
11.4 mL
10 % P 6.25 1.6 % N 2 g
H2SO4 0.25 mol/L
4.6 mL
20 % P 6.25 3.2 % N 2 g
H2SO4 0.25 mol/L
9.1 mL
50 % P 6.25 8.0 % N 2 g
H2SO4 0.5 mol/L
11.4 mL
General recommendation
The correction factor for self prepared solutions is called titer.
The use of standardized titration solutions make a titer determination unnecessary.
Exact titrant concentration = concentration x titer
The titer of the titrant must be known. In case, it is unknown, it must be determined.
Example: Exact titrant concentration = 0.100 mol/L x 0.998
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