Xia Chang-bin, He Xiang-zhu, Huang Nian-dong, Shi Hong-wen
Institute of Environmental Eng. and Chemical Hi-tech. Xiangtan Polytechnic University, Xiangtan 411201, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2003 Feb;23(1):205-6.
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.
在硝酸介质中，利用偶氮胂III被重铬酸根（Cr2O7(2-)）氧化的褪色反应来测定含铬粉煤灰中的痕量铬。结果表明，该褪色反应在3.2 mol·L-1硝酸介质中具有高灵敏度，在520 nm处摩尔吸光系数为3.9×10(6) L·mol-1·cm-1，Cr(VI)在0.0 - 40.0 μg·L-1范围内遵守比尔定律。测定了粉煤灰中的铬含量，结果令人满意。
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