Currently working with equipment-limited Cr quantification methods, specifically for concentrations of 1 to 1000 ppm, I selected a Cr(VI) quantification methodology by direct UV–visible spectrometry using the cite below. However, I am also in need of the quantification of Total Chromium for the additional measurement of Cr(III).
I have noted the possibility of measuring total chromium by converting all chromium species in my sample to Cr(VI), I would like to know suggested methodologies for this conversion and measurement. Thank you.
Sanchez-Hachair, A., & Hofmann, A. (2018). Hexavalent chromium quantification in solution: Comparing direct UV–visible spectrometry with 1, 5-diphenylcarbazide colorimetry. Comptes Rendus Chimie, 21(9), 890-896.
I seem to recall (long ago), that someone used an ion specific electrode (ISE) that they attached to their pH meter (but I can't find it). Thus, review this article: Article Extent of oxidation of Cr(III) to Cr(VI) under various condi...
To measure the overall chromium content, encompassing both Cr(VI) and Cr(III), one can utilize an oxidizing agent to transform all chromium species into Cr(VI). Subsequently, a suitable quantification method, such as direct UV-visible spectrometry, 1,5-diphenylcarbazide colorimetry, or ion chromatography coupled with ICP-MS, can be applied to determine the total concentration of Cr(VI).
https://www.epa.gov/sites/default/files/2015-12/documents/7196a.pdf
Hexavalent chromium quantification in solution: Comparing direct UV–visible spectrometry with 1,5-diphenylcarbazide colorimetry
Arnaud Sanchez-Hachair1 ; Annette Hofmann1
Comptes Rendus. Chimie, Tome 21 (2018) no. 9, pp. 890-896.
https://www.aquaref.fr/system/files/Aquaref_2019_D1.1c4_Chrome_VF_0.pdf
Thank you all for your answers, I’ve found the cite bellow for a detailed oxidation of Cr(III) using MnO2.
Chen, K., Bocknek, L., & Manning, B. (2021). Oxidation of Cr (III) to Cr (VI) and production of Mn (II) by synthetic manganese (IV) oxide. Crystals, 11(4), 443.
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