Metrohm 761 Compact IC - Manual (Page 45)

2.7 Precolumns and separating columns
761 Compact IC
35
2.7.5 General information on separating columns
New IC separating columns are normally filled with solution and
sealed at both ends. Before the column is installed in the system, it
must be ensured that this solution is freely miscible with the eluent
used (check manufacturer's specifications).
The IC separating columns and precolumns currently available from
Metrohm are listed in section 6.3.2. A test chromatogram and an infor-
mation leaflet is provided with each column. You will find additional in-
formation concerning these columns in the 8.732.2003 Metrohm Mono-
graph «Ion chromatography» and in special "Application Bulletins",
which are available on request free of charge from your local Metrohm
agency.
When you install the column, always ensure that this is inserted
correctly in accordance with the flow direction shown (arrow must
point upwards).
2.7.6 Selection of the sample loop
Selection of the sample loop depends on the separating column used.
Normally, the following sample loops are used:
Cation columns 10 µ L
Anion columns with suppressor 20 µ L
Anion columns without suppressor 10 µ L
Depending on the instrument version, the following sample loops are
installed in the 761 Compact IC 761:
Version Sample loop Volume
2.761.0010 6.1825.230 (PEEK) 10 µ L
2.761.0020 6.1825.210 (PEEK) 20 µ L
If desired, the built-in sample loop can be replaced by one of the sam-
ple loops available as an option (see section 6.3.1).