Metrohm 850 Professional IC Anion MCS Prep 2 - Manual (Page 24)

2.3 Flow diagram
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850 Professional IC – Anion – MCS – Prep 2
Procedure:
1 Sample measurement
The sample is rinsed for a defined time period onto the preconcen-
tration column (3-15) at the injection valve (3-7) and retained there.
Then the injection valve (3-7) is switched to and data
recording is started. The eluent carries along the sample retained on
the preconcentration column (3-15) to the separation column.
2 1. Standard addition
Note
The sample path should be rinsed between measurements.
Analogous to Step 1, but an additional defined amount of standard
solution is rinsed onto the preconcentration column (3-15) at the
injection valve (3-7) after the sample. The amount of standard solu-
tion is measured at the additional injection valve (3-14) and injected
into the sample path (one injection corresponds to calibration level
1).
3 2. Standard addition
Similar to Step 2, but with twice the amount of standard solution
(two injections correspond to calibration level 2).
4 X. Standard addition
Carry out the amount of standard additions required.