ICP-MS分析不同产地南寒水石原生矿石微量元素含量

Analysis of Trace Elements in Calcite Raw Ore from Different Areas by ICP-MS

关键词:  南寒水石  矿物药  微量元素  显微结构  电感耦合等离子体质谱  晶体缺陷

Key words:  calcite  mineral medicine  trace element  microstructure  ICP-MS  crystal defect

摘要:

目的 对中国西南地区3个不同产地的矿物药南寒水石进行形态特征、显微结构和微量元素含量研究，为南寒水石的药用提供实验依据。方法 通过对紫木凼(贵州省贞丰县)、八渡乡(广西壮族自治区田林县)、者桑乡(云南省富宁县)3个不同产地的15个南寒水石应用显微镜及电感耦合等离子体质谱(ICP-MS)技术进行显微结构及微量元素含量研究。结果 紫木凼地区南寒水石常和雄黄共生，呈乳白色、暗灰色，以脉状和块状呈现；稀土元素含量明显低于其余两地，且富含中稀土元素，砷(As)、锆(Zr)、锑(Sb)元素含量明显高于其余两地。八渡地区南寒水石主要为乳白色块状和脉状，粒径较大，显微镜下可见明显的菱面体条纹；稀土元素含量均一，但铕(Eu)元素异常富集，钪(Sc)、钇(Y)、钡(Ba)元素含量明显高于其余两地南寒水石。云南省富宁县者桑地区南寒水石以乳白色粗脉状为主，矿物组合单一，镜下粒径较小且颗粒之间以锯齿状接触。者桑地区南寒水石富集中重稀土元素，且Sc元素变化范围大，其含量明显高于其余两地南寒水石，含量最高可达18.4 μg·g^–1。结论 不同地区所产南寒水石的形态、显微结构、微量元素含量具有明显差异，南寒水石原生矿石在作为药材使用时应注意对其加工炮制剔除掉共生杂质矿物。

Abstract:

OBJECTIVE To study the morphological characteristics,microstructure and trace element contents of calcite from 3 different areas in southwest China and to provide experimental basis for the medicinal use of calcitum.METHODS The microstructures and trace element contents of 15 calcite from 3 different producing areas in Zimudang (Zhenfeng County,Guizhou Province),Badu (Tianlin County,Guangxi Province) and Zhesang (Funing County,Yunnan Province) area were studied by using microscope and inductively coupled plasma mass spectrometry (ICP-MS).RESULTS In the Zimudang area,calcite was often associated with realgar.The calcite was milky white and dark gray,and the calcite was vein-like and massive.The content of rare earth elements in calcite was significantly lower than that in the other two places,and the calcite was rich in rare earth elements,and the content of As,Zr and Sb elements in calcite were significantly higher than those in the other two places.The calcite in Badu area was mainly milky white massive and veined,and the calcite particle size was large,and visible rhombohedral stripes could be seen under the microscope.The rare earth elements in Badu calcite were uniform,but Eu element were abnormally enriched.The contents of Sc,Y and Ba in Badu area were significantly higher than those in other areas.The calcite in Zhesang area was mainly milky white with coarse veins,single mineral assemblage,small particle size and serrate contact between particles under the microscope.The calcite in Zhesang area was rich in heavy rare earth elements and had a wide range of Sc elements.The content of Sc elements in the calcite in Zhesang area was significantly higher than that in other places,with the maximum content of 18.4 μg·g^–1.CONCLUSION The morphology,microstructure and contents of trace elements of calcite in different regions are obviously different.When calcitum raw ore is used as medicinal materials,attention should be paid to its processing to eliminate the symbiotic impurities.