Abstract
Abstract The use of an electrochemical detector for the ion chromatographic detection of non-oxidizable anions such as F−, PO4 −3, NO3 −, and SO4 −2 is described. The electrochemical detector is placed in line after a fiber suppressor and responds to eluent pH changes as the dissociated acids pass through the detector. The intensity of the signal is dependent on the applied potential at the cell with 0.3V being an optimum. Minimum detection limits with a 0.10 mL sample injection volume are below 0.5 ppm for F−, Cl−, PO4 −3, NO3 −, and SO4 −2. No adverse effects on the silver working electrode have been observed.
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