Chemistry Reference
In-Depth Information
• up to six automated values made of chemically inert, metal-free material eliminate
corrosion and metal contamination;
• liquid flow path is completely compatible with all high performance liquid
chromatography solvents;
• electronic valve switching, multi-dimensional, coupled chromatography or multi-mode
operation;
• automated sample clean up or pre-concentration;
• environmentally isolates up to four separator columns and two suppressors for optimal
results;
• manual or remote control with Dionex Autoion 300 or Autoion 100 automation
accessors;
• individual column temperature control from ambient to 100°C optional.
Dionex Ion-Pac Columns
Features are:
• polymer ion exchange columns are packed with new pellicular resins for anion or cation
exchange applications;
• 4µ polymer ion exchange columns have maximum efficiency and minimum operating
pressure for high-performance ion and liquid chromatography applications;
• new ion exclusion columns with bifunctional cation-exchange sites offer more
selectivity for organic acid separations;
• neutral polymer resins have high surface area for reversed-phase ion-pair and ion-
suppression applications without pH restriction;
• 5 and 10µ silica columns are optimised for ion-pair, ion suppression and reversed phase
applications.
Micromembrane suppressor
The micromembrane suppressor makes possible detection of non-ultraviolet absorbing
compounds such as inorganic anions and cations, surfactants, antibiotics, fatty acids and
amines in ion exchange and ion-pair chromatography. Two variants of this exist: the
anionic (AMMS) and the cationic (CMMS) suppressor. The micromembrane suppressor
consists of a low dead volume eluent flow path through altering layers of high-capacity
ion exchange screens and ultra-thin ion exchange membranes. Ion exchange sites in each
screen provide a site-to-site pathway for eluent ions to transfer to the membrane for
maximum chemical suppression.
Dionex anion and cation micromembrane suppressors transform eluent ions into less
conducting species without affecting sample ions under analysis. This improves
conductivity detection, sensitivity, specificity and baseline stability It also dramatically
increases the dynamic range of the system for inorganic and organic ion chromatography.
The high ion exchange capacity of the MMS permits changes in eluent composition by
orders of magnitude, making gradient ion chromatography possible.
In addition, because of the increased detection specificity provided by the MMS
sample, preparation is dramatically reduced, making it possible to analyse most samples
after filtering and dilution.
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