Metrohm 797 VA Computrace Manuale Utente Pagina 272
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- Indice
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9 Troubleshooting
797 VA Computrace – Software
260
Samples
1. The amount of sample depends on the concentration of the
element to be determined.
2. If the sample matrix is known, a better assessment of the
analysis can be made (organic components?).
3. A digestion must be carried out on contaminated samples and
on samples where contamination is suspected (see Metrohm
Monograph «Sample preparation for techniques in voltam-
metric trace analysis»).
4. A lot of errors are made during sampling and when storing the
sample. Caution and a critical approach are required.
5. The sample should have a good solubility in the electrolyte and
be mixable with it.
Blank values, contamination
The following points should be checked if the results are too
high:
1. Have the dilutions been made correctly?
2. Have contamination risks been excluded?
3. Contamination risks are very high at low concentrations:
measuring vessels should be conditioned with dilute HNO
3
so-
lution.
4. Are the chemicals pure enough?
"Suprapure" grade reagents should be used at low concentra-
tions.
5. Very high concentrations were measured in the previous analy-
sis:
electrodes and measuring vessels must be carefully cleaned and
conditioned (memory effects).
6. Has the standard addition been carried out properly?
Was the volume set correctly on the pipetting unit?
The following points should be checked if the results are too
low:
1. Concentration too high?
HMDE overloaded, use DME/SMDE instead?
2. Buffer not correct?
Make up new one if necessary.
3. Addition ratio too low?
4. Addition ratio too high?
Selection of VA Measurement mode
The following points should be considered by selecting the VA
measurement mode:
- 797 VA Computrace 1
- Table of contents 10
- Table of contents 11
- 1 Introduction 13
- 1.2 General information 14
- 1.3 Installation 14
- 1.3 Installation 15
- 1 Introduction 16
- 1.5 Overview of file types 19
- 1.6 Context sensitive menus 20
- 2 Main window 21
- 2 Main window 22
- 2.3 File menu 24
- 2.3 File menu 25
- 2.4 Mode menu 27
- 2.5 Utility menu 28
- 2.6 User menu 28
- 2.6 User menu 29
- 2.7 Settings menu 32
- 2.7 Settings menu 33
- 2.8 Window menu 46
- 2.8 Window menu 47
- 3.1 Electrodes 48
- 3.1 Electrodes 49
- Drop size [ 1...9 ; 4 ] 50
- 3.2 VA measurement modes 52
- 3.2 VA measurement modes 53
- METHOD SPECIFICATIONS 54
- KING METHOD SPECIFICATIONS 56
- Normal pulse 58
- 3.3 Potentiostat 71
- 3.5 Graphical settings 76
- 3.5 Graphical settings 77
- Color of the line 81
- 4 Exploratory mode 82
- 4 Exploratory mode 84
- 4.3 Exploratory curves 86
- 4.3 Exploratory curves 87
- PLORATORY CURVES 97
- EXPLORA 97
- TORY SPECIFICATION 97
- 5 Determination mode 98
- 5 Determination mode 100
- 797 VA Computrace – Software 101
- 5.3 Monitor 120
- 5.3 Monitor 121
- 5.4 Determination curves 130
- 5.4 Determination curves 131
- 5.5 Results 141
- 5.5 Results 143
- Electrode test 145
- 5.6 Sample table 146
- 5.6 Sample table 147
- Voltammogram 154
- Chronoamperogram 154
- Minimum 157
- Recommended 157
- 6 Electroplating Bath VA 162
- Calibra 205
- Calibration 205
- Calibration tech 207
- 7 Manual control 209
- 7 Manual control 210
- 7.2 Dosing Device control 211
- 7.3 Pump control 212
- 7.4 Film deposition 213
- 7.5 Cleaning procedure 215
- 8 How to ...? 217
- 8.2 User rights 218
- DOSINOS window: 239
- Suppressor standard 247
- Rinsing solution 247
- Response curve) 253
- 8.10 Diagnostic procedures 265
- 9 Troubleshooting 269
- 9.4 Dosing Device problems 270
- 9 Troubleshooting 272
- AC – Alternating 273
- FICATION 273
- METHOD PARAMETERS 273
- 9.6 Voltammetric problems 274
- 9.6 Voltammetric problems 275
- Software license 288
- Software license 289
- Index 291
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