Iodide analysis by anion-exchange chromatography and pulsed amperometric detection in surface water and adsorbable organic iodide.
An anion-exchange chromatography method in combination with pulsed amperometric detection (PAD) was developed for the analysis of dissolved iodide in surface water and in absorption solutions obtained from adsorbable organic iodide (AOI) determination. The development of the amperometric waveform for a selective detection using a silver-working electrode together with the optimization of the injection volume and digital signal smoothing is described in detail. This combination of excellent selectivity, exhibits a detection limit of 0.02 microg/L, without any need of sample treatment other than micro-filtration. The results of AOI determination of the method described in this article are compared with results obtained with a different ion chromatography approach applying UV detection.
Bruggink
Cees
C
Dionex Benelux BV, Abberdaan 114, 1046 AA Amsterdam, The Netherlands. cees.bruggink@dionex.nl
van Rossum
Willem J M
WJ
Spijkerman
Ed
E
van Beelen
Eric S E
ES
D000837:Anion Exchange Resins / Q000737:chemistry; D002852:Chromatography, Ion Exchange / Q000379:methods*; D003217:Conductometry / Q000379:methods; D004563:Electrochemistry / Q000295:instrumentation* / Q000379:methods*; D004566:Electrodes; D005618:Fresh Water; D007454:Iodides / Q000032:analysis* / Q000737:chemistry*; D012680:Sensitivity and Specificity; D012834:Silver
D000837:Anion Exchange Resins; D007454:Iodides; D012834:Silver