Speciation of Trivalent/Hexavalent Chromium in Fly-ash Extracts by Solid-phase Extraction/Atomic Absorption Spectrometry Using a Chelate Resin Treated with Iron (III) Nitrate

In this study, we tried to quantify trivalent chromium (Cr(III)) and hexavalent chromium (Cr(VI)) in fly ash eluate by atomic absorption spectrometry using chelate resin solid phase extraction method. By treating Nobias Chelate PA1 in the chelate resin solid-phase extraction column with an iron(III) nitrate solution, Cr(III) in fly-ash eluate can be captured on the frit of the solid-phase extraction column or resin and Cr(VI) can be passed through the column. It was possible to separate Cr(III)center dot Cr(VI). This method is a pretreatment method that can be carried out easily and in a short time because the pretreatment is completed simply by passing the sample solution through the column. This method is also applicable to samples that are difficult to measure due to color development inhibition in the diphenylcarbazide-absorption spectrometry widely used as a measurement method of Cr(VI) by adjusting the pH of the eluate to 10.7 or higher.