CTAB-TBP-Au(CN)_2-萃合物水分子数的测定  

Determination of the Water Molecular Number in CTAB-TBP-Au(CN)_2^- Extracted Species

作　　者：李楷中[1] 周晓明[1] 陈景[1] 吴瑾光[2] LI Kaizhong;ZHOU Xiaoming;CHEN Jing;WU Jinguang(Kunming Institute of Precious Metals, Kunming 650106, China;College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China)

机构地区：[1]昆明贵金属研究所,昆明650106 [2]北京大学化学与分子科学学院,北京100871

出　　处：《贵金属》2017年第1期36-41,共6页Precious Metals

基　　金：云南省省院省校合作项目(B9808K)

摘　　要：添加表面活性剂后,碱性氰化液中的金被高效萃取,水分子在萃合物结构中提供氢键。以十六烷基三甲基溴化铵(CTAB)为表面活性剂,磷酸三丁酯(TBP)为萃取剂的体系具有很好的萃金效率,用^(198)Au示踪活化、微库仑水分测定(卡尔-费休法)和红外光谱法对该体系进行了分析,并用线性拟合的方式研究有机相中水和金的定量关系。结果表明,萃合物中水浓度与金浓度线性相关,摩尔比约为4;红外光谱分析结果显示,有机相中的金、氰根和水的含量有固定比例,萃合物具有稳定的化学组成。With the addition of a certain surfactant,gold in alkaline cyanide solution can be effectivelyextracted.Water molecules play an important role as hydrogen bond donors in extracted species.Theextracting system consisting of cetyltrimethyl ammonium bromide(CTAB)as the surfactant and of tributylphosphate(TBP)as the extraction agent has high extraction efficiency.198Au isotope labelled tracer,micro-coulometric water titration(Karl Fischer)and IR spectroscopy were used to analyzing extractng,process while the linear fitting method to calculate the quantitative relationship between gold and water inthe organic phase.The results showed a linear correlation between the concentrations of water and gold inextracted species,and the mole ratio was about4.IR spectra indicated that the content ratio of gold tocyanide to water is fixed,and the extracted species had a stable chemical composition.

关 键 词：分析化学 溶剂萃取 Au(CN)2- 萃合物 水分子 测定 

分 类 号：O658.2[理学—分析化学]