Thermo Fisher Scientific is pleased to announce
a new combined method for the accurate determination of organic acids in a
wastewater sample. Application Note 291:
Determination of Organic Acids in Wastewater Using
Ion-Exclusion Chromatography and On-Line Carbonate Removal demonstrates that ion-exclusion
chromatography excludes the inorganic anions present in the sample. A Thermo
Scientific Dionex
Carbonate Removal Device (CRD 200) is also
needed to remove carbonate on line. Inorganic anions and carbonate can
interfere when determining organic acids in wastewater using anion-exchange
chromatography.
Inorganic anion interferences can be eliminated
easily by using ion-exclusion chromatography because they are excluded from the
column (i.e., not retained). Carbonate is naturally present in wastewater and
can interfere with organic acid determinations, even using ion-exclusion
chromatography, due to the fact that carbonate is a weak acid that is retained
by the column.
This application and many others can be found at
www.thermoscientific.com/dionex
under the
Documents tab.
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