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Effect of ammonia in the ion-chromatographic determination of trace anions and optimization of analytical conditions

✍ Scribed by M.L. Balconi; F. Sigon

Publisher: Elsevier Science
Year: 1986
Tongue: English
Weight: 557 KB
Volume: 191
Category: Article
ISSN: 0003-2670
DOI: 10.1016/s0003-2670(00)86316-3

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✦ Synopsis

The ion-chromatographic determination of traces of anions in the fluids of a thermal power plant is examined with an on-line automated system. Ammonia in the sample affects the analytical response for the Dionex AS4-A and AS2 anion-separation columns, because of the variable efficiency of the preconcentration. This effect can be corrected for, without sample pretreatment, by evaluating the response surface of the systems. The use of the more sensitive AS4-A column requires the chloride peak to be shifted away from the "water dip" in the chromatograms. Simplex optimization of the eluent enabled this to be done for samples without ammonia. Real utilization of AS4-A columns is however inhibited if samples contain organic acids because their peaks are not well resolved from that of chloride under the conditions adopted.

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