[Spectrophotometric determination of trace chromium in fly ash].
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.
Xia
Chang-bin
CB
Institute of Environmental Eng. and Chemical Hi-tech. Xiangtan Polytechnic University, Xiangtan 411201, China.
He
Xiang-zhu
XZ
Huang
Nian-dong
ND
Shi
Hong-wen
HW
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
D003031:Coal; D060729:Coal Ash; D052638:Particulate Matter; D014874:Water Pollutants, Chemical; D002857:Chromium; D002244:Carbon