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Dionex Easion Operator's Manual
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3.10.2 Pretreating
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3.10.3 Diluting
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36
Analyze samples containing nitrite or sulfite as soon as possible.
Nitrite oxidizes to nitrate, and sulfite to sulfate, thus increasing the
measured concentrations of these ions in the sample. In general,
samples that do not contain nitrite or sulfite can be refrigerated for at
least one week with no significant changes in anion concentrations.
Analyze rainwater, drinking water, and air particulate leach solutions
directly with no sample preparation (other than filtering and possibly
diluting).
Filter groundwater and wastewater samples through 0.45 m filters
before injection, unless samples were filtered after collection.
A Thermo Scientific
(P/N 044105) is available for removing particulates down to
0.45 micron from samples. Connect the inline filter between the
Dionex AS-DV outlet and the sample inlet port on the injection valve.
For more information, refer to High-Pressure Inline Filter
Installation Instructions (Document No. 032319).
Before injection, pretreat samples that may contain high
concentrations of interfering substances by putting them through
™
Thermo Scientific
information, refer to the cartridge manual.
If a Dionex AS-DV is installed, you may want to use Thermo
™
™
Scientific
Dionex
OnGuard resin and allow for automated sample preparation. For more
information, refer to the vial cap manual.
Because the concentrations of ionic species in different samples can
vary widely from sample to sample, no single dilution factor can be
recommended for all samples of one type. In some cases (for
example, many water samples), concentrations are so low that
dilution is not necessary.
Use eluent or ASTM Type I (18.2 megohm-cm) filtered and
deionized water to dilute the sample. When using carbonate eluents,
™
™
Dionex
High-Pressure Inline Filter
™
™
Dionex
OnGuard
™
Guardcap
vial caps, which contain Dionex
II cartridges. For more
Doc. 155028-01 08/20
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