Metrohm 790 Personal IC User Manual Page 162
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5.1 Practical notes on ion chromatography
790 Personal IC
153
5.1.3 Eluents
Treatment
For the preparation of the eluents, only chemicals of a purity degree of
at least "
p.a.
" should be used. For diluting, please use only
high purity
water
.
Fresh eluents should always be
microfiltered
(0.45
µ
m filter) and
de-
gassed
(with N
2
, He or vacuum). For alkaline eluents and eluents with
low buffering capacity one should preferably use a
CO
2
absorber
.
The supply vessel containing the eluent must be closed as tightly as
possible to avoid excessive evaporation. This is primarily important with
eluents containing organic solvents (e.g. acetone), the evaporation of
which can lead to drifts in the long term. If work is performed in a very
sensitive range, even if one drop of condensate falls back in the eluent
this can cause a noticeable change in the background conductivity.
Influence of various parameters on anion columns
• Concentration:
An increase in the concentration usually leads
to shorter retention times and quicker separa-
tion, but also to a higher background conduc-
tivity.
• pH:
pH alterations lead to shifts in the dissociation
equilibrium and thus to changes in the reten-
tion times.
• Organic modifiers:
Addition of an organic solvent (e.g. methanol,
acetone, acetonitrile) to aqueous eluents ge-
nerally accelerates lipophilic ions.
Eluent change
When the eluent is changed, it must be ensured that
no precipitates
can be formed. Solutions used in direct succession must therefore be
miscible. If the system has to be rinsed with an organic solution, several
solvents with increasing or decreasing lipophilic character may possibly
have to be used (e.g. water
↔
acetone
↔
chloroform).
5.1.4 Peristaltic pump
The 6.1826.060 pump tubings used by the peristaltic pump are con-
sumable material with a limited lifetime and should be exchanged at
regular intervals (approx. every 4 weeks under continuous use; see
section 5.2.10
).
The working life of pump tubing depends to a considerable extent on
the contact pressure. This is why the contact pressure must be cor-
rectly set as described in
section 2.9.2
. If the pump is to remain
switched off for a lengthy period of time the tubing cartridges
40
4040
40
should
be raised completely by loosening the snap-action lever
43
4343
43
on the
right-hand side (the set contact pressure remains unchanged).
- 790 Personal IC 1
- Table of contents 2
- 3 Operating tutorial 3
- 4 Operation 3
- List of figures 7
- 1 Introduction 10
- 1.2 Parts and controls 12
- 1 Introduction 13
- 1.733.0110 Detector block) 15
- 1.3.1 Organization 19
- SYSTEM STATE 20
- <OK> 20
- 1.4 Safety notes 21
- 2 Installation 22
- 2.2.1 Packaging 24
- 2.2.2 Check 24
- 2.2.3 Location 24
- 2.3.5 Filter unit PEEK 27
- 2.4 Mains connection 28
- 2.4.2 Fuses 29
- 2.5 Connection to the PC 30
- 2.5.3 Basic settings 31
- Hardware 33
- Hardware settings 33
- Cell constant 33
- 2.6 High-pressure pump 34
- Flow rate 41
- <Send to unit> 41
- <On> 41
- <Off> 41
- 2.8 Suppressor module 46
- 2.9 Putting into operation 52
- File / Open / System 53
- 790com1 53
- 790com2 53
- Prep MSM.smt 53
- <Open> 53
- Startup determination 54
- Run time 55
- 2 Installation 59
- 3.2 Preparations 61
- 3.3 Calibration 62
- 3.4 Sample determination 69
- 4.1.2 Glossary 73
- 4.1.4 Main window elements 75
- 4.1.9 Help 78
- 4.2.1 Fonts 79
- 4.2.2 Security system 79
- 4.2.3 Global settings 80
- 4.2.4 COM port 82
- 4.3 Systems 83
- 4.3.3 System functions 84
- 4.3.4 PC icon 86
- 4.3.5 Watch window 86
- 4.3.6 Instrument icon 87
- 4.3.7 System state window 93
- 4.4 Methods 95
- Data Log 101
- <Add new> 101
- New comment 101
- 4.4.3 Method setup 102
- 790 Personal IC 103
- 4.4.4 Integration 105
- Component table 109
- Components table 111
- 4.4.6 Report output 121
- 4.5 Chromatograms 133
- 4.5.4 Peak editor 142
- 4.5.5 Printing 144
- 4.6 Sample queue 147
- 4.6.2 Sample queue control 148
- 4.6.3 Sample queue editor 150
- 4.7 Batch reprocessing 153
- REPROCESS / 157
- <Merge> 157
- Appearance 157
- File / Save / Chroma 157
- 5.1.1 Separating columns 160
- 5.1.2 High-pressure pump 161
- 5.1.3 Eluents 162
- 5.1.4 Peristaltic pump 162
- 5.1.5 Suppressor module 163
- 5.1.6 Connections 163
- 5.2.1 General information 164
- 5.2.2 Passivation 164
- 5.2.3 Recycling 165
- 5.2.4 Shutdown 165
- 93 and 170
- 5.3 Faults and malfunctions 177
- 6 Appendix 180
- 6.1.4 High-pressure pump 181
- 6.1.5 Peristaltic pump 181
- 6.1.6 Suppressor module 182
- 6.1.7 RS232 interface 182
- 6.1.8 Remote interface 182
- 6.1.9 Mains connection 183
- 6.1.10 Safety specifications 183
- 6.1.12 Ambient temperature 183
- 6.1.13 Housing 184
- 6.2 Standard equipment 185
- 2.790.0010 186
- 2.790.0020 186
- 6.3 Optional accessories 188
- 6.4 Warranty and conformity 195
- EU Declaration of Conformity 196
- 6.5 Index 198
- 6 Appendix 199
- 6.5 Index 200
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