Metrohm 828 IC Dual Suppressor - Manual (Page 9)

1.1 Instrument description
828 IC Dual Suppressor/ 8.828.1003 Instructions for Use
1
1 Introduction
1.1 Instrument description
The 828 IC Dual Suppressor is a continuous, regeneration-free solid
phase suppressor which is used to increase the sensitivity of the
detection of anions in ion chromatography.
As well as the usual chemical suppression of the
carbonate/bicarbonate background, in a second suppression step the
suppressor also removes dissolved CO
2
in order to reduce the
background conductivity of the mobile phase even further. This results
in an improved signal-to-noise ratio; peak areas in the ppm-range and
above are increased by approx. 30%. At the same time the areas of the
injection peak (water dip) and the system peak are reduced to a
minimum. The reduction of the injection peak means that the detection
of early-eluting anions is improved; the reduction of the system peak
allows the detection of anions which coelute with the system peak. The
baseline drift is also minimized when carbonate/bicarbonate gradients
are used.
In Metrohm IC systems the 828 IC Dual Suppressor can be remotely
controlled via a remote interface. It can also be combined with all other
commercially available HPLC systems.