摘要
本文介绍一种新的用于锑、铋分析的碘化铵分解装置。作者研究了锑、铋及其化合物与碘化铵一起加热时的挥发性质,给出一系列实验数据,确定了挥发分离微量锑、铋的必要条件,拟定了岩石中微量锑、铋分离与分光光度测定的流程。本方法标准误差为S_(sb)=0.38;S_(Bi)=0.23,适用于锑、铋含量在X—X·10^(?)ppm范围的岩石样品分析。
A decomposition apparatus was established consisting of a reaction tube and a long air-cooling condenser for the separation of antimony and bismuth through volatilization. It is demonstrated that the reaction Sb203+6NH4I=2SbI3+6NH3+3H20 starts at 300℃ and completes at 380℃ in 8 min. In comparison, the reaction Bi203+6NH4It=2Bil3+ 6NH8+3H2O will mot take place below 450℃ and Will complete at 550℃. The differen-ces in boiling point and volatilizing temperature between antimony and bismuth iodide are large enough to make them separated at different temperatures. Experimental data show that antimony iodide was sublimated at 380℃ without any loss of bismuth, and upon the completion of SibI8 volatilization the long condenser tube can be substituted for by a clean one to collect volatilizing bismuth iodide at the temperature of 550℃ Resu-lts are in gciod agreement with those obtained from thermodifferential-thermogravimetric analyses.Determination of antimony was done using extraction spectrophotometric method with the reagent 5-Br-PADAP, and that of bismuth using spectrophotometric method with Xylenol Orange. The method is simple, rapid, accurate 'and suitable for rock and other geological samples containing antimony and bismuth in the range of X-X 102 ppm.
出处
《地球化学》
CAS
1986年第1期78-84,共7页
Geochimica
