| 在热液内金属铅的物种形式原位观测实验 |
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| 引用本文：胡书敏，张荣华，张雪彤.2006.In_situ observations of liquid speciation forms of lead in hydrothermal fluids[J].Mineral Deposits,25(4):511~520 |
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| 基金项目:国家自然科学基金项目（20373064、29673008）国家科技部项目（2001DEA30084、2003DEA2C021、2001DEA20023B）和国土资源部项目（20010302） |
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| 中文摘要:文章应用高温高压腔连接紫外_可见谱仪研究了150℃条件下铅在含氯溶液里的物种形式。实验的体系是Pbs_NaCl_HCl_H2O。实验结果表明，铅在含氯溶液里的物种形成有2个步骤：Pb2++Cl-→PbCl+，PbCl++Cl-→PbCl2，处于平衡态时为PbCl2。溶液的氯浓度、温度、反应延续时间影响物种形式。 |
| 中文关键词:地球化学 金属铅的物种形式 原位观测 紫外_可见谱 石英窗口高温高压腔 |
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| In_situ observations of liquid speciation forms of lead in hydrothermal fluids |
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| Abstract:Speciation of metal in Cl_aqueous solutions at 150℃ was examined by using a high pressure and temperature cell connected to an UV_Visible spectrometer. PbS and aqueous solution were put in a high pressure vessel with a quartz window, through which UV_Visible light can pass. The cell was pressurized, and the cell was put in a heating box. Then this box was installed in the VUV spectrometer. The high pressure cell was heated until the pressure inside the cell reached the saturation vapor pressure. We could observe and test the UV_Visible spectra of the speciation of metal_bearing solutions at high temperature and saturation vapor pressure and could also continue to observe the changes of the speciation with time, temperature, and nature of solutions. In this way, the kinetic study of mineral_solution system could be realized, and the experimental system of PbS_NaCl_HCl_H2O was tested. The experiments indicate that two steps are involved in the speciation process of Pb_bearing solution, namely, Pb2++Cl-→PbCl+and PbCl++Cl-→PbCl2. The main species is PbCl2 in the solution near saturation. Concentration of Cl_bearing species, temperature and resident time affect the speciation. |
| keywords:geochemistry, speciation of lead, in_situ observation, UV_visible spectrum, pressure cell with quartz window |
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