Metrohm 757 VA Computrace Manual de usuario Pagina 10
- Pagina / 198
- Tabla de contenidos
- SOLUCIÓN DE PROBLEMAS
- MARCADORES
Valorado. / 5. Basado en revisión del cliente
Table of contents
757 VA Computrace – Software
VIII
8.5 General rules for VA trace analysis.............................................. 164
Chemicals and equipment......................................................... 164
Electrolytes ................................................................................. 164
Standard solutions ..................................................................... 164
Samples ..................................................................................... 165
Blank values, contamination ...................................................... 165
Selection of VA Measurement mode ......................................... 166
8.6 Voltammetric problems................................................................... 167
Low background current or unstable baseline .......................... 167
Curves with high noise ............................................................... 168
Standard addition curves are not reproducible ......................... 169
Peak displacement..................................................................... 169
No peak found ........................................................................... 170
Peak is in the highest µA range ................................................. 170
Double peak............................................................................... 171
Standard addition peaks displaced........................................... 172
No addition................................................................................. 172
Spikes / signal jump in voltammogram ..................................... 172
Oxygen interference ................................................................... 173
Unsuitable bridging electrolyte in the reference electrode ........ 173
Overcharging of the working electrode...................................... 174
Disturbances at the HMDE through gas formation ................... 175
Complex formation..................................................................... 176
Peak on highly curved baseline ................................................. 177
Peak overlapping ....................................................................... 178
Calibration with chemically non-isoformal standards................ 179
Software license
............................................................................
181
Index
...........................................................................................................
183
- 757 VA Computrace 1
- Table of contents 3
- Exploratory mode 5
- Determination mode 6
- Troubleshooting 9
- Software license 10
- 1 Introduction 11
- 1.2 General information 12
- 1.3 Installation 13
- Method 2 16
- 1.5 Overview of file types 20
- 1.6 Context sensitive menus 20
- 2 Main window 21
- 2.3 File menu 24
- 2.4 Mode menu 26
- 2.5 Utility menu 27
- 2.6 User menu 27
- 2.7 Settings menu 31
- 2.8 Window menu 35
- 3 General settings for 37
- Voltage step 38
- Drop size 38
- [ 1...9 ; 4 ] 38
- Stirrer/RDE (rpm) 40
- [ 0...3000 rpm ; 2000 rpm ] 40
- 3.2 VA measurement modes 41
- SqW - Square wave 43
- EXPLORATORY SPECIFICATION 43
- WORKING 43
- METHOD SPECIFICATIONS 43
- DC - Sampled direct current 45
- WORKING METHOD SPECIFICATIONS 45
- NP - Normal pulse 47
- CV - Cyclic voltammetry 49
- Potential limit (V) 52
- [ -5...+5 V ; -0.1 V ] 52
- Maximum time (s) 52
- [ > 0 ; 20 s ] 52
- 3.3 Potentiostat 55
- 3.5 Graphical settings 59
- Width [ 0...8 ; 0 ] 64
- 4 Exploratory mode 65
- 4.3 Exploratory curves 70
- 5 Determination mode 81
- Voltammetric 87
- WORKING METHOD SPECIFI 87
- 5.3 Monitor 98
- <Next> 99
- 757 VA Computrace – Software 100
- 5.4 Determination curves 104
- DETERMINATION CURVES 105
- TERMINATION CURVES 105
- 5.5 Results 113
- Substances 115
- Cell volume 115
- Substance 115
- 5.6 Sample table 118
- Determination method 122
- Working method 122
- Order [ 1...6 ; ] 122
- Sample table 122
- BASELINE 126
- Front end 126
- Rear end 126
- Peak voltage 127
- Peak height 127
- Derivative 127
- Peak area 127
- CALCULATION 130
- No. of replications 132
- 6 Manual control 135
- 6.2 Dosimat control 137
- 6.3 Film deposition 138
- 6.4 Cleaning procedure 140
- 6 Manual control 142
- 7 How to ...? 143
- 7.2 User rights 144
- Measure blank 150
- No. of blanks 150
- Blank purge time 150
- <OK> 150
- 7.5 Determinations 151
- 7.9 Diagnostic procedures 166
- END OF DETERMINA 170
- 8 Troubleshooting 171
- 8.3 Software problems 172
- 8.4 Dosimat problems 172
- 8.6 Voltammetric problems 177
- Deposition time 181
- Deposition potential 181
- Exponential 187
- 8 Troubleshooting 190
- Index 193
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