The Dionex DX-500 Liquid Ion Chromatography is
an advanced system suitable for analyzing the dissolved ion
composition of all types of natural waters. A PeakNet WorkStation
is used to control the instrument, collect data, process data,
and generate reports. Ion separations are performed with different
IonPac analytical columns. The separated ions are measured with
a CD20 conductivity detector with suppressed conductivity detection.
The EG-40 Eluent Generator with SRS-ULTRA Self-Regenerating
Suppressor enhances analytical sensitivity by providing superior
suppression of background eluent conductivity, resulting in
a significant improvement in analyte detection limits. Coupled
with the AS-40 Autosampler, the analytical process is fully
Routine measurements of ions include both anions and cations:
Fluoride (F-) and chloride (Cl-), nitrate
lithium (Li+), sodium (Na+),
potassium (K+), magnesium (Mg2+)
and calcium (Ca2+).
Samples can originate from any aqueous system, whether a lake,
stream or interstitial waters, but must be free of debris and
aggregated particles. Normally, field collected samples need
to be filtered through a 0.20 µm membrane filter. Many
simple organic anions, such as citrate and formate, may also
be quantified using this system.