Metrohm 732 IC Detector - Manual (Page 69)

3 Operating tutorial
732 IC Detector / 733 IC Separation Center
62
3.5 Sample determination
Following the calibration of the IC system as described in section 3.4
the first sample solution can be injected.
1 Filter drinking water sample
⇒ Filter the drinking water sample with a 0.45 µ m microfilter.
2 Trigger auto-zero
ZERO
⇒ Press the key. This starts the automatic elec-
tronic background compensation. During zeroing, the
green LED in the key starts to flash. As soon as zeroing is
at an end, the green LED in the key is perma-
nently on.
3 Set injection valve A to "FILL"
FILL
⇒ Press the key for injection valve A on the 733 IC
Separation Center. This switches the injection valve to the
"FILL" position. This position is indicated by lighting up of
the green LED in the key.
4 Fill sample loop
⇒ Immerse the suction tubing 88 88 attached to connection 22 22
in the vessel containing the drinking water sample.
⇒ Use the syringe fastened to connection 21 21 to siphon in ca.
1 mL sample.
5 Set injection valve A to "INJECT"
INJECT
⇒ Press the key for injection valve A on the 733 IC
Separation Center. This switches the injection valve to the
"INJECT" position and the chromatogram is started. The
"INJECT" position is indicated by lighting up of the green
LED in the key.
⇒ At the same time start the recorder (if used).
An integrator attached to the 733 IC Separation Center or a
PC with evaluation software (e.g. «IC Metrodata for Win95»)
is started automatically when injection valve A is switched
to the "INJECT" position.
+0.000 µµS/cm 0.0 min
full scale: 4.00 µµS/cm
As soon as injection valve A is in the "INJECT" position, the
current time is reset to " 0.0 min " . This marks the start time
of the chromatogram.
The ion chromatogram of the drinking water sample is
recorded during the next 20 min or so.
Fig. 20 shows an example of a drinking water sample.