Objective: To study microscopic structure and trace element content of cinnabar primary ore produced in Guizhou Province in order to provide experimental basis for processing and medicinal use of cinnabar primary ore. Methods: The microstructures and contents of trace elements of 21 primary cinnabar ore samples from Thallium mercury mine in Lanmuchang, Zhenfeng County and Sixiang mercury mine in Danzhai County were studied by microscopic and inductively coupled plasma mass spectrometry (ICP-MS) technique. The transmitted light and reflected light structure pictures of cinnabar were obtained by microscope. The sample was digested by adding hydrogen bromide (HBr), hydrofluoric acid (HF) and nitric acid (HNO3) into cinnabar powder, and then rhodium (Rh) internal standard solution and deionized water at constant volume to prepare test solution for machine test. ICP-MS used argon as carrier gas to generate plasma at nearly 7 000 ℃ by high-frequency oscillation. Rhodium element was used as internal standard element to monitor test drift. Results: The cinnabar produced in Danzhai County and Zhenfeng County had a high degree of crystallization, and the cinnabar was generally granular, lumpiness and veined. Cinnabar was usually symbiotic with quartz, calcite, pyrite, arsenopyrite and other minerals, and the symbiotic relationship was complex, often in the form of inclusion, Mosaic, infection structure. The contents of 51 trace elements in 21 cinnabar samples were significantly different. The contents of aluminum (Al), iron (Fe), barium (Ba) and other trace elements in cinnabar were relatively high, ranging from 1.98 μg·g-1 to 53 278 μg·g-1. The contents of most trace elements in cinnabar were low including lithium (Li), cobalt (Co), nickel (Ni), gallium (Ga), rubidium (Rb), yttrium (Y), niobium (Nb), molybdenum (Mo), silver (Ag), antimony (Sb), praseodymium (Pr), samarium (Sm), europium (Eu), gadolinium (Gd). The contents of thorium (Th) and other elements were about 1 μg·g-1.The contents of vanadium (V), chromium (Cr), germanium (Ge), yttrium (Y), cadmium (Cd), cerium (Ce), niobium (Nd) in cinnabar from the Sixiangchang were about 1 μg·g-1. Conclusion: Except for Al, Fe and Ba, the contents of trace elements in cinnabar produced by Thallium mercury mine in Langmuchang and Sixiangchang mercury mine are generally low. However, the microstructure and mineral symbiosis of cinnabar primary ores are complex. Therefore, it is necessary to remove the symbiosis mineral impurities before cinnabar primary ores can be considered for medicinal use.
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ChP 2020.Vol I[S].2020:143
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