Metrohm 850 Professional IC Cation - Prep 2 - Manual (Page 23)

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2 Installation
850 Professional IC – Cation – Prep 2
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3 High pressure pump
See Chapter 2.10. 4 Purge valve
See Chapter 2.10.1.
5 Inline filter
See Chapter 2.11. 6 Pulsation damper
See Chapter 2.12.
7 Injection valve
See Chapter 2.15. 8 Separation column
See Chapter 2.20.
When a guard column (see Chapter 2.19,
page 57) is used, it is installed between
injection valve and separation column.
9 Detector
See Chapter 2.17. 10 Eluent output
Connection to the waste container.
11 Sample input 12 Injection valve
For sample preparation. See Chapter 2.15.
13 Sample output 14 Sample degasser
See Chapter 2.13. Use optional.
15 Transfer solution inlet
Connection to transfer solution container.
16 Peristaltic pump
Pumps the transfer solution. See Chapter
2.14.
17 Preconcentration column
For sample preconcentration.
18 Transfer solution outlet
Connection to the waste container.
Standard addition with preconcentration
It is often the case that there are no certified standards available for com-
plicated sample matrices. "Standard addition with preconcentration" tech-
nology can be applied in order to prevent adulterations of the analysis
results caused by the matrix.
Procedure:
1 Sample measurement
The sample is rinsed for a defined time period onto the preconcen-
tration column (3-13) 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 (3-13) to the separation column.
2 1. Standard addition
Note
The sample path should be rinsed between measurements.