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  • Title: [Spectrophotometric determination of trace chromium in fly ash].
    Author: Xia CB, He XZ, Huang ND, Shi HW.
    Journal: Guang Pu Xue Yu Guang Pu Fen Xi; 2003 Feb; 23(1):205-6. PubMed ID: 12940011.
    Abstract:
    In HNO3 medium the fading reaction of arsenazo III oxidated with Cr2O7(2-) was used as to determine trace Cr in fly ash containing Cr. The results show that the fading reaction has high sensitivity in the medium of 3.2 mol.L-1 nitric acid, the molar absorptivity of 3.9 x 10(6) L.mol-1.cm-1 at 520 nm, and Beer's law is obeyed for Cr (VI) in the range of 0.0-40.0 micrograms.L-1. Contents of Cr in fly ash were determined with satisfactory results.
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