Cr能氧化甲酚蓝褪色，本文借此进行新的光度法测定铬的研究 。实验表明，在2.88～3.96 mol／L H2SO4介质中，有色溶液 的最大吸收波长为590nm，铬浓度在0～30μg／25mL范围与吸光 度的减少值呈线性关系，表观摩尔吸光系数为2.82×104。方法用于测定土 壤中微量铬时，结果满意。
In this paper the fading reaction of cresol blue oxidized by Cr in H2SO4 medium is presented. The decreased absorbance caused by thi s fading reaction colour is directly proportional to the amounts of chromium. The maximum absorptivity wavelength is 590nm and the apparent molar absorptivity is 2 .82×104L*mol－1*cm－1.The Linear ra nge is 0-30μg／25mL for chromium.T he method has been applied to the determination of trace chromium in soil with satisfactory results.
参考文献
| [1] | Z Marczenko.Spectrophotometric Determination of Elements[M].New York :Ellis Horwood Ltd,1976 |
| [2] | 奚旦立;孙裕生;刘秀英.环境监测[M].北京:高等教育出版社,1996:218. |
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