Metrohm 850 Professional IC Anion MSM-HC - LP-Gradient - Manual (Page 62)

3.18 High Capacity Metrohm Suppressor Module (MSM-HC)
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850 Professional IC Anion MSM-HC LP Gradient
3.18 High Capacity Metrohm Suppressor Module
(MSM-HC)
3.18.1 General information on the MSM-HC
The MSM-HC is used for chemical suppression during anion analysis if elu-
ents with a high ionic concentration are used or if the concentration is
being significantly increased in the course of a gradient application. It con-
sists of 3 suppressor units in total, which are used for suppression, regen-
erated with sulfuric acid or rinsed with ultra pure water in rotation.
Suppression reaction in the MSM-HC
When using a carbonate eluent, the following reaction (amongst others)
occurs in the MSM-HC:
R-SO
3
- H + + NaHCO
3
/Na
2
CO
3
➙ R-SO
3
- Na + + H
2
O + CO
2
3.18.2 Connecting the MSM-HC
Caution
To protect the MSM-HC against foreign particles or bacterial growth, a
6.2744.180 pump tubing connection with filter must be mounted
between the peristaltic pump and the inlet capillaries of the MSM-HC.
The three inputs and outputs of the suppressor units numbered with 1, 2
and 3 on the MSM-HC each have 2 fixed mounted PTFE capillaries (see
Figure 29, page 53).