title: [Spectrophotometric determination of trace chromium in fly ash].
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.
authors.affiliation: Institute of Environmental Eng. and Chemical Hi-tech. Xiangtan Polytechnic University, Xiangtan 411201, China.
authors.forename: Chang-bin
authors.initials: CB
authors.lastname: Xia
authors.forename: Xiang-zhu
authors.initials: XZ
authors.lastname: He
authors.forename: Nian-dong
authors.initials: ND
authors.lastname: Huang
authors.forename: Hong-wen
authors.initials: HW
authors.lastname: Shi
mesh_terms: D002244:Carbon / Q000737:chemistry*; D002857:Chromium / Q000032:analysis*; D003031:Coal; D060729:Coal Ash; D052638:Particulate Matter; D013053:Spectrophotometry / Q000379:methods; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods
chemical_list: D003031:Coal; D060729:Coal Ash; D052638:Particulate Matter; D014874:Water Pollutants, Chemical; D002857:Chromium; D002244:Carbon