应用电感耦合等离子体质谱法(ICP-MS)测定地球化学样品中痕量银时,受到相对地球化学丰度高的Nb,Zr,Y等元素的离子化合物干扰严重,样品不经富集分离,银的测试结果偏差非常大。本研究以负载二苯硫脲泡塑选择性富集Au和Ag,实现了Au和Ag与...应用电感耦合等离子体质谱法(ICP-MS)测定地球化学样品中痕量银时,受到相对地球化学丰度高的Nb,Zr,Y等元素的离子化合物干扰严重,样品不经富集分离,银的测试结果偏差非常大。本研究以负载二苯硫脲泡塑选择性富集Au和Ag,实现了Au和Ag与其它干扰元素的分离,建立了负载二苯硫脲泡塑富集、硫脲解脱-ICP-MS同时测定痕量Au和Ag的新方法。方法采用王水(1∶1)封闭消解矿样,补加水量50 m L,振荡时间和吸附温度分别为25 min和20℃,Au和Ag的方法检出限分别为0.02和0.007μg/g。使用本方法对8个国家一级标准物质中Au和Ag的检测结果与标准值基本相符,确证了方法的可行性。展开更多
The silver contents of organic matter in the host rocks of the Songxishale-hosted Ag-Sb deposit of northeastern Guangdong, South China, have been directly determinedusing the electron microprobe technique. The silver ...The silver contents of organic matter in the host rocks of the Songxishale-hosted Ag-Sb deposit of northeastern Guangdong, South China, have been directly determinedusing the electron microprobe technique. The silver contents in two types of organic matter, marinevitrinite and solid bitumen, vary in the range from 100 X 10^(-6) to 350 X 10^(-6), which are fromtens of times to thousands of times higher than those of the host rocks in the ore deposit. Theaverage silver content of the organic matter is also several times higher than the pay grade ofsilver for commercial mining of the ore deposit. It is quite obvious that the organic matter of thehost rocks in the ore district is characterized by an anomalous enrichment of silver. The results ofthis study indicate that the silver anomalies in the organic matter have been derived from both thehost rocks and the silver-bearing fluids of the Songxi black shale ore source. In the course ofsedimentation and later hydrothermal reworking, organic matter was able to entrap the element silverfrom source rocks and silver-bearing fluids through complexation and reduction, so that silvercould be further enriched (or precipitated) in the solid bitumen. The quantitative assessment inthis study suggests that the distribution of solid bitumens in the ore district may be considered anindication for mineral exploration.展开更多
文摘应用电感耦合等离子体质谱法(ICP-MS)测定地球化学样品中痕量银时,受到相对地球化学丰度高的Nb,Zr,Y等元素的离子化合物干扰严重,样品不经富集分离,银的测试结果偏差非常大。本研究以负载二苯硫脲泡塑选择性富集Au和Ag,实现了Au和Ag与其它干扰元素的分离,建立了负载二苯硫脲泡塑富集、硫脲解脱-ICP-MS同时测定痕量Au和Ag的新方法。方法采用王水(1∶1)封闭消解矿样,补加水量50 m L,振荡时间和吸附温度分别为25 min和20℃,Au和Ag的方法检出限分别为0.02和0.007μg/g。使用本方法对8个国家一级标准物质中Au和Ag的检测结果与标准值基本相符,确证了方法的可行性。
基金the National Natural Science Foundation of China(Grant 49872037)the State Education Ministry Foundation for excellent young teachers the Youth Science Foundation of Jiangsu Province(Grant BQ96007)
文摘The silver contents of organic matter in the host rocks of the Songxishale-hosted Ag-Sb deposit of northeastern Guangdong, South China, have been directly determinedusing the electron microprobe technique. The silver contents in two types of organic matter, marinevitrinite and solid bitumen, vary in the range from 100 X 10^(-6) to 350 X 10^(-6), which are fromtens of times to thousands of times higher than those of the host rocks in the ore deposit. Theaverage silver content of the organic matter is also several times higher than the pay grade ofsilver for commercial mining of the ore deposit. It is quite obvious that the organic matter of thehost rocks in the ore district is characterized by an anomalous enrichment of silver. The results ofthis study indicate that the silver anomalies in the organic matter have been derived from both thehost rocks and the silver-bearing fluids of the Songxi black shale ore source. In the course ofsedimentation and later hydrothermal reworking, organic matter was able to entrap the element silverfrom source rocks and silver-bearing fluids through complexation and reduction, so that silvercould be further enriched (or precipitated) in the solid bitumen. The quantitative assessment inthis study suggests that the distribution of solid bitumens in the ore district may be considered anindication for mineral exploration.
