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三辛胺(TOA)从盐酸介质中萃取、富集金,已应用于原子吸收光谱法测定金,其高灵敏度及选择性使该方法成为金的十分理想的测定方法。本文考查了TOA从盐酸介质中萃取金(Ⅲ)的机理,试图对金(Ⅲ)的萃取分离及测定提供理论依据。 TOA系Fluka进口分装,使用时按计算量配成所需浓度的CCl_4溶液;HAuCl_4用纯金(99.99%)制备;NaCl为基准试剂;其它试剂均不低于分析纯。水相由HAuCl_4-HCl-NaCl配 相似文献
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稀土萃取分离过程皂化产生的含盐废水严重污染环境。利用P507萃取稀土离子、N235萃取酸的特性,设计了P507-N235双溶剂无皂化稀土萃取体系,研究了双溶剂有机相的稳定性及对Nd3+的协萃效应。P507与N235混合时发生放热现象,红外光谱分析显示其特征峰发生了变化,但32次萃取-再生后的混合萃取剂的化学结构稳定;P507与N235对Nd3+具有显著的协萃效果,形成的萃合物为REA3.(R3N.HA).3R3NHCl。研究结果为无皂化稀土萃取分离新工艺开发提供了依据。 相似文献
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Due to the lack of a stable technetium isotope, and the high mobility and long half-life, 99Tc is considered to be one of the most important radionuclides in safety assessment of environmental radioactivity as well as nuclear waste management. 99Tc is also an important tracer for oceanographic research due to the high technetium solubility in seawater as TcO4−. A number of analytical methods, using chemical separation combined with radiometric and mass spectrometric measurement techniques, have been developed over the past decades for determination of 99Tc in different environmental samples. This article summarizes and compares recently reported chemical separation procedures and measurement methods for determination of 99Tc. Due to the extremely low concentration of 99Tc in environmental samples, the sample preparation, pre-concentration, chemical separation and purification for removal of the interferences for detection of 99Tc are the most important issues governing the accurate determination of 99Tc. These aspects are discussed in detail in this article. Meanwhile, the different measurement techniques for 99Tc are also compared with respect to advantages and drawbacks. Novel automated analytical methods for rapid determination of 99Tc using solid extraction or ion exchange chromatography for separation of 99Tc, employing flow injection or sequential injection approaches are also discussed. 相似文献
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用三辛胺萃取法处理高浓度含Cr(Ⅵ)废水 总被引:1,自引:0,他引:1
用三辛胺萃取法处理高浓度含Cr(Ⅵ)废水褚莹,刘沛妍,阎淑荣,吴子生,严忠(东北师范大学化学系长春130024)关键词三辛胺,Cr(Ⅵ),萃取处理含Cr(Ⅵ)废水的萃取剂有三烷基胺(N235)、三辛胺(TOA)、季胺盐及磷酸三丁脂(TBP),稀释剂为... 相似文献
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