Efficiency of a re-usable Carius tube for determination of platinum group elements in ultramafic rocks  

作　　者：LIU Yingying QI Liang ZHAO Zheng HUANG Xiaowen WANG Yichang 

机构地区：[1]State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences [2]University of Chinese Academy of Sciences [3]Key Laboratory of Metallogeny and Mineral Resource Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences

出　　处：《Chinese Journal Of Geochemistry》2014年第1期45-52,共8页中国地球化学学报

基　　金：funded by the China’s Lunar Exploration Program (TY3Q 20110029);"CAS Hundred Talents" Project from the Chinese Academy of Sciences to Prof. Qi Liang (KZCX2-YW-BR-09);National Natural ScienceFoundation of China (NSFC 40973049)

摘　　要：Digestion with aqua regia in Carius tube is commonly employed for determination of PGEs in geological samples. However, silicates cannot be completely dissolved by aqua regia and PGEs might partially remain in silicate residue. In this study, an ultramafic reference material was used to investigate the efficiencies of a new re-usable Carius tube after digestion at 220 and 240℃, and an autoclave-lined Carius tube at 260 and 280℃. The results show that about 10% of PGEs retained in the silicate residues at 220 and 5% still r℃ emains even digestion temperature increases to 280℃. These results agree with previous works that increasing the digestion pressure and temperature can achieve more effective dissolution. Thus, a modified digestion procedure for determination of PGEs in ultramafic rocks by the re-usable Carius tube was proposed in this study.Digestion with aqua regia in Carius tube is commonly employed for determination of PGEs in geological samples. However, silicates cannot be completely dissolved by aqua regia and PGEs might partially remain in sili- cate residue. In this study, an ultramafic reference material was used to investigate the efficiencies of a new re-usable Carius tube after digestion at 220 and 240℃, and an autoclave-lined Carius tube at 260 and 280℃. The results show that about 10% of PGEs retained in the silicate residues at 220℃ and 5% still remains even digestion temperature increases to 280℃. These results agree with previous works that increasing the digestion pressure and temperature can achieve more effective dissolution. Thus, a modified digestion procedure for determination of PGEs in ultrama- fic rocks by the re-usable Carius tube was proposed in this study.

关 键 词：可重复使用 铂族元素 卡洛斯 超基性岩 测定 消化过程 超镁铁质岩石 温度升高 

分 类 号：P618.53[天文地球—矿床学]