Summary
A post chromatographic chemical reaction detector is described for the determination of Cr (III) and Cr (VI) in the range of 100ng/ml to 10µg/ml. All chromium species which exist in a lower oxidation state than the sixvalent form are oxidized to chromate in a lead dioxide solid phase reactor. The detection is performed by complexation of the chromate with 1,5-diphenylcarbazide, which forms a red-violet complex detectable at 540 nm. The conditions which are necessary for a fast oxidation inside the solid phase reactor are discussed. The system which can also be run in the flow injection mode is applied to measurements of synthetic waste waters and to samples from a steel work.
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Rüter, J., Fislage, U.P. & Neidhart, B. Post column derivatization with a lead dioxide solid phase reactor as part of a continuous chromatographic detection system: Speciation measurements of chromium. Chromatographia 19, 62–66 (1984). https://doi.org/10.1007/BF02687720
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DOI: https://doi.org/10.1007/BF02687720