微晶酚酞-十六烷基三甲基溴化铵分离富集Ag^(+)  

Separation and enrichment of Ag^(+) by microcrystalline phenolphthalein-cetyltrimethyl ammonium bromide

作　　者：赵亚鹏 左国强[2] 刘改云[2] ZHAO Ya-peng;ZUO Guo-qiang;LIU Gai-yun(Jiyuan Municipal Center for Disease Control and Prevention,Jiyuan,Henan 459000,China;不详)

机构地区：[1]济源市疾病预防控制中心,河南济源459000 [2]济源职业技术学院冶金化工系,河南济源459000

出　　处：《中国卫生检验杂志》2022年第5期521-523,527,共4页Chinese Journal of Health Laboratory Technology

基　　金：河南省2020年科技发展计划项目(202102210259)。

摘　　要：目的建立十六烷基三甲基溴化铵(CTMAB)-微晶酚酞体系共沉淀浮选分离富集Ag^(+)的新方法。方法在含50μg Ag^(+)的溶液中,分别加入一定量的2.0×10^(-3)mol/L十六烷基三甲基溴化铵(CTMAB)溶液和缓冲溶液,逐滴加入7%的酚酞乙醇溶液,加水定容到25 ml,加入适量的盐,振荡摇匀5 min后静置一段时间,沉淀悬浮于液面上,过滤,原子吸收光谱法测定滤液中剩余的Ag^(+),计算Ag^(+)的富集率。结果一定条件下,Ag^(+)可与CTMAB电离的Br^(-)形成AgBr沉淀,该沉淀可被均匀分布在溶液中的微晶酚酞吸附,振荡后,被酚酞吸附的AgBr沉淀浮选至CTMAB形成的泡沫层,从而实现微痕量Ag^(+)的分离富集。在最优的实验条件下,Ag^(+)的浮选率可达到100%。结论该方法简单、快速、条件易于控制,有望用于废水中Ag^(+)的处理和水样中Ag^(+)的监测。Objective A novel method for the separation and enrichment of Ag^(+)with microcrystalline phenolphthalein-cetyltrimethyl ammonium bromide(CTMAB)was developed in the paper.Methods A certain amount of 2.0×10^(-3)mol/L CTMAB solution and buffer solution were added to the solution containing 50μg Ag^(+),and 7%phenolphthalein ethanol solution was added drop by drop,and water was added to a constant volume of 25 ml,and an appropriate amount of salt was added.After shaking for 5 min,it was left to stand for a period of time.The precipitation was suspended on the liquid surface,and the remaining Ag^(+)in the filtrate was determined by atomic absorption spectrometry,and the enrichment rate of Ag^(+)was calculated.Results Under certain conditions,Ag^(+)and Br^(-)ionized CTMAB can form AgBr precipitation,which can be adsorbed by microcrystalline phenolphthalein uniformly distributed in the solution.After shaking,AgBr adsorbed by phenolphthalein is precipitated and floated to the foam layer formed by CTMAB,thus achieving the separation and enrichment of microtrace Ag^(+).Under the optimal experimental conditions,the flotation rate of Ag^(+)can reach 100%.Conclusion The developed method is simple,fast and easy-controlling,which is expected to be used for the treatment of Ag^(+)in wastewater and the monitoring of Ag^(+)in water samples.

关 键 词：微晶酚酞 银 分离 

分 类 号：O655[理学—分析化学]