| Summary: | There are no ore standard materials which are characterized by the dispersed elements germanium and indium. In order to meet the need of geological exploration, Pb-Zn ores from Fankou of Guangdong were used as the candidates of Ge-ores and Pb-Zn ores from Tongkeng, Nandan of Guangxi were used as the candidates of In-ores. According to Class A standard material specifications, germanium ore (GBW07831) and indium ore (GBW07833) were prepared by ten laboratories using different analysis methods. Germanium ore standard contains certified values of 45 elements, whereas In-ore standard contains certified values of 47 elements. These elements include characteristic elements, coexisting elements, 15 rare earth elements, rock-forming elements and trace elements. The contents of Ge and In are 21.6×10-6 and 39.7×10-6, respectively in the germanium and indium ores. The two standard materials extend the types of ore standard material in China, which can be used as a chemical composition standard for Ge and In ores and used in daily quality control.
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