| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a measurement method of accurately measuring rate of reduction of chrome in a process of reducing trivalent chrome to divalent chrome. <P>SOLUTION: The measurement method features measurement of absorbance at a wavelength of 400 nm to 450 nm before and after reduction treatment or oxidation treatment for a sample liquid including chrome, and measurement of a change in valence of chrome based on, for example, a ratio of absorbance V1 before treatment to absorbance V2 after treatment. For example, the rate of reduction of chrome is measured based on the absorbance V1 before reduction to the absorbance V2 after reduction, and wavelengths of 424 nm, 432 nm, and 417 nm are used for measurement for a chromium chloride solution [A], a hydrochloric acid chrome solution [B], and a sulfuric acid chrome solution [C], respectively. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
