Abstract

In this paper, techniques are presented to overcome interferences from caustic matrices and neighboring ions found in process solutions. Column switching and the use of low-capacity columns to characterize strongly retained analytes are described. Oxalate, sulfide, sulfite, sulfate and thiosulfate are characterized on one set of separator columns. High-capacity cation-exchange resins are shown to be an effective pre-treatment tool for neutralizing a caustic chlorine dioxide scrubbing liquor, enabling baseline resolution of chlorate.

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