摘要
在酸性介质中，Ｃｅ（Ⅳ）在过量的Ｆｅ（Ⅱ）中被完全还原后，余下的Ｆｅ（Ⅱ）在ＰＨ４．６ＮａＡｃ－ＨＡｃ缓冲溶液中与邻二氮菲生成桔红色络合物，溶液的颜色随Ｃｅ（Ⅳ）量的增加而呈线性降低．借此建立了分光光度法测定Ｃｅ的新方法．其表观摩尔系数为１．１×１０￣４Ｌ·ｍｏｌ－１·ｃｍ－１，Ｃｅ（Ⅳ）量在０～３．２ｍｇ／Ｌ范围内服从比尔定律．本方法在用于测定稀土氧化物中的Ｃｅ时，结果满意。
t was shown that cerium(Ⅳ ) can be reduced by excess iron (I ) in acid mediumand residual iron (I ) forms an orange - red complex with phenanthroline in NaAc -- HAcbuffer (pH4. 6). The decrease in colour is proportional to the amount of Cerium (0￣3. mg/L). The maxium absorptional wavelength is 510nm and its apparent molar absorptivity is1.1 × 104 L. mol-1. cm-1. The results are satisfactory in using this method for the determination of trace cerium in rare earth.
出处
《广东工业大学学报》
CAS
1995年第4期110-113,共4页
Journal of Guangdong University of Technology
关键词
铈
分光光度法
稀土
Cerium
Spectrophotometry
rare earth
