Estimation of Cr(III) in Water with the Presence of Cr(VI) by Chlorophosphonazo I Color Reaction Spectrophotometry

Speciation of Chromium

“…For example, in "Estimation of Cr(III) in Water with the Presence of Cr(VI) by Chlorophosphonazo I Color Reaction Spectrophotometry", Zhang et al confirmed that chlorophosphonazo I did not react with Cr(VI), and less than 0.4 μg/mL of Cr was detected. 7 Electrochemical methods have intrinsic advantages because the redox potentials of the Cr(III) and Cr(VI) species are largely different. Jin et al reported "Electrochemical Determination of Chromium(VI) in River Water with Gold Nanoparticles-Graphene Nanocomposites Modified Electrodes", in which the composites facilitated the electron-transfer processes, leading to the observation of Cr(VI) at a low detection limit (10 nM) by amperometric detection.…”