Abstract
Using ion-chromatography it was possible to determine traces of iodide quantitatively without interferences in samples with a high main content of salts. The sensitivity of the procedure could be severely enhanced (factor 150) by the application of a direct photometric detection of iodide at 226 nm in contrast to the normally used conductivity or indirect UV detection. Further advance of the method is due to the fact that nearly no pretreatment of the samples was necessary compared with other methods for the trace analysis of iodide. The detection limit for the direct iodide determination in pure solutions was about 10 ppb, with possible decrease by pre-concentration procedures of aqueous samples.
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