Metrohm 850 Professional IC Anion MCS Prep 3 - Manual (Page 52)

2.14 Sample preparation module (SPM)
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850 Professional IC –Anion – MCS – Prep 3
2.14.3 Inline sample preparation with the SPM
This chapter briefly describes the processes of the two sample preparation
techniques:
￭ Cation exchange before feeding the sample (see "Cation exchange",
page 42).
￭ Neutralization of an alkaline sample before feeding (see "Neutraliza-
tion", page 43).
For a better overview, the flow paths of the regeneration and the rinsing
solution in the SPM are not shown in the following figures.
Cation exchange
The SPM can be used for the separation of cations (e.g. of heavy metals)
before feeding the sample onto the separation column.
Procedure of the cation exchange with the SPM
The SPM, the injection valve and the MSM-HC are used for the cation
exchange with sequential suppression.
Note
If you are not sure whether the capacity of the SPM is sufficient for your
application, you should use a system with sample measuring and pre-
concentration for more heavily loaded samples requiring a matrix elimi-
nation and preconcentration, as it is described in chapter Neutraliza-
tion.
1 Cation exchange
￭ Injection valve position: Fill
￭ The sample flows through the SPM (24-A).
The cations of the sample will continuously be exchanged for H
+
ions.
￭ The sample flows on through the sample loop of the injection
valve (24-B).