Metrohm 871 Advanced Bioscan - Manual (Page 30)

4 Notes - Maintenance - Faults
871 Advanced Bioscan / Instructions for Use 8.871.1003
22
4 Not
nance - Faults
4.1 Handling the 871 Advanced Bioscan
General
Amperometric detection takes place with a flowing current and there-
fore with a chemical conversion of the analyte. The course of a chemi-
cal reaction depends directly on various physical parameters, among
other things. In order to obtain optimum measuring conditions (e.g.
ol-
Constant temperature
onstant pH
ry carefully and check
its pH at regular intervals.
Pulsation-free eluent flow
Changes to the eluent flow should be avoided as far as is possible. The
6.2620.150 Pulsation Absorber is available for this purpose; it is
mounted between the 818 IC Pump and the injection valve.
Never make dry measurements
es - Mainte-
stable baseline or reproducible signals) it is necessary to take the f
lowing points into consideration.
The 871 Advanced Bioscan allows the interior of the instrument to be
kept at a constant temperature of up to max. 45°C. The lower limit is the
ambient temperature plus 10 °C. You can activate the oven and define
the temperature in the 871 method parameters window (in IC Net).
C
The characteristic current/potential curves of all electrochemically reac-
tive substances depend very strongly on the pH of the pH eluent used.
This means that you should prepare the eluent ve
The flow-through measuring cell must not be switched on if it is not
being rinsed constantly by the eluent or if the measuring cell is not
connected up properly!
4.2 Practical notes on ion chromatography
4.2.1 Separating columns
Separation efficiency
The attainable quality of analyses with an IC system depends to a large
extent on the separation efficiency of the column used. When purchas-
ing an IC column you should ensure that the separation efficiency suf-