Metrohm 920 Absorber Module - Manual (Page 30)

4.3 Dosino for ultrapure water
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920 Absorber Module
Dosing transfer water for the sample
The transfer water transports the sample to the IC instrument. In order to
obtain accurate analysis results, the transfer water has to be free of ionic
contamination. To remove all traces of ionic contamination, a Metrosep I
Trap 1 – 100/4.0 (6.1014.200) column is used between the Dosino for
ultrapure water and the 6-port valve.
The Dosino aspirates ultrapure water from the bottle and starts by dosing
it to the Metrosep I Trap 1 – 100/4.0 (6.1014.200) through port 1 and to
port 5 of the 6-port valve from there.
Liquid Handling
A Dosino can either aspirate or discharge defined quantities of liquids via
its four ports. In conjunction with the 10-port valve, it is used to transport
liquids through the Combustion IC system. This process is called Liquid
Handling.
Port 3 of the Dosino is connected to transfer tubing and is used for Liquid
Handling.