Buchi KjelFlex K-360 Manual do Utilizador Página 17
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3 Technical data
17 KjelFlex K-360 Operation Manual, Version C
3.3 Titration solution
The amount of sample and the concentration of the titrant should be optimized, so that the titrant
volume is between 2 and 18 ml (burette volume: 20 ml).
Table 3-5: Titration solution 1
N-amount N-content Sample size Titrant Titrant concentration Titrant volume
5 mg N 0.5 % N 1 g
H
2
SO
4
0.01 mol/l
17.8 ml
10 mg N 1.0 % N 1 g
H
2
SO
4
0.05 mol/l
7.1 ml
50 mg N 5 % N 0.1 g
H
2
SO
4
0.01 mol/l
17.8 ml
100 mg N 10 % N 1 g
H
2
SO
4
0.25 mol/l
14.3 ml
100 mg N 10 % N 1 g
H
2
SO
4
0.5 mol/l
7.1 ml
200 mg N 20 % N 1 g
H
2
SO
4
0.5 mol/l
14.3 ml
200 mg N 20 % N 1 g
H
2
SO
4
1 mol/l
7.1 ml
Table 3-6: Titration solution 2
P-content P-factor N-content Sample size Titrant Titrant concentration Titrant volume
1 % P 6.25 0.16 % N 2 g
H
2
SO
4
0.01 mol/l
11.42 ml
2 % P 6.25 0.32 % N 1 g
H
2
SO
4
0.01 mol/l
11.42 ml
5 % P 6.25 0.80 % N 2 g
H
2
SO
4
0.1 mol/l
5.71 ml
10 % P 6.25 1.6 % N 2 g
H
2
SO
4
0.1 mol/l
11.42 ml
10 % P 6.25 1.6 % N 2 g
H
2
SO
4
0.25 mol/l
4.57 ml
20 % P 6.25 3.2 % N 2 g
H
2
SO
4
0.25 mol/l
9.14 ml
50 % P 6.25 8.0 % N 2 g
H
2
SO
4
0.5 mol/l
11.42 ml
General recommendation
Hydrochloric acid has the disadvantage of degassing. Therefore Buchi recommends to use sulfuric
acid as titrant.
The correction factor for self prepared solutions is called a 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
3.4 Reference substances
Table 3-7: Reference substances
Name Purity % N theoretical
(100 % purity)
Recommended
sample size
Recommended titrant
concentration
Digestion necessary
Ammonium
dihydrogen
phosphate
99.5 12.18 0.8 g c(H
2
SO
4
) = 0.25
mol/l
No
Glycine 99.7 18.66 0.5 g c(H
2
SO
4
) = 0.25
mol/l
Yes
Phenylalanine 99.0 8.47 0.9 g c(H
2
SO
4
) = 0.25
mol/l
Yes
Ammonium
sulfate
99.5 21.21 0.4 g c(H
2
SO
4
) = 0.25
mol/l
No
- KjelFlex K�360 1
- Table of contents 3
- 1 About this manual 6
- 2 Safety 7
- 2.2 User qualification 9
- 2.3 Proper use 9
- 2.4 Improper use 9
- 2.5 Product safety 9
- 2.6 General safety rules 11
- 3 Technical data 12
- Product Order number 13
- 3.2 Technical data K-360 16
- 3.3 Titration solution 17
- 3.4 Reference substances 17
- 3.5 Materials used 18
- 4 Description of function 19
- 4.2 Function principle 20
- 4.3 Kjeldahl applications 20
- Fig. 4.3: Stop-cock 21
- 5 Putting into operation 23
- Fig. 5.3: Tank connection 25
- 5.4 Level sensors (optional) 26
- 6 Operation 29
- Fig. 6.2: Configuration 35
- Fig. 6.3: Pump calibration 36
- Fig. 6.4: Date/Time 36
- Fig. 6.5: Settings 37
- Fig. 6.6: Titrator 37
- Fig. 6.7: Dispenser 39
- Fig. 6.8: User/Password 39
- Fig. 6.9: User 40
- Fig. 6.10: Keypad 40
- Fig. 6.11: Method 41
- Fig. 6.12: Method list 41
- 6.6 Instrument modes 42
- 6.7 System preparation 42
- Fig. 6.14: Sample 43
- Fig. 6.15: Sample List 44
- Fig. 6.16: Analysis screen 44
- Fig. 6.17: Result screen 45
- Fig. 6.18: Result list 45
- 7 Maintenance 47
- 7.1 Daily maintenance 48
- 7.2 Monthly maintenance 49
- 7.3 Maintenance as required 49
- 7.4 Yearly maintenance 53
- 8 Troubleshooting 54
- 8.2 Diagnostics 56
- 9.2 Storage and transport 59
- 9.3 Disposal 59
- 10 Spare parts 60
- Product Order number 61
- 12 Index 69
- BÜCHI Labortechnik AG 74
- T +41 71 394 63 63 74
- F +41 71 394 65 65 74
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