Usually it is not the analysis itself that causes
problems, but rather the sample matrix in which the analysis
is to be carried out. The «MIC-6 Advanced» modular
anion system
- with chemical suppression,
- sample pre-concentration
and
- matrix elimination
simplifies sample preparation
in two respects: on the one hand matrix effects
can be eliminated, while on the other hand the pre-concentration
technique can be used to reliably determine low
concentrations. The «contaminated» sample is transferred to
the «sample loop» of valve B by the built-in
peristaltic pump of the 838 Advanced IC Sample Processor.
The valve is switched and now uses de-ionized water, supplied
via the 833 IC Liquid Handling Pump Unit, to transfer the
sample to the pre-concentration column located on valve
A of the 820 IC Separation Center. At the same time the
de-ionized water is used to rinse the contaminants from
the pre-concentration column. These steps can be repeated
as often as necessary. When the enriched sample volume
is large enough, valve A is switched and the sample is
transferred to the separating column – now without
the interfering matrix.
Matrix elimination significantly increases the working
life of the anion and cation columns. Sample pre-concentration
extends the range of applications. Automation reduces
the costs per sample. With Metrohm Advanced IC Systems
you
can safely meet all the demands placed on you.
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