微晶酚酞-十六烷基三甲基溴化铵分离富集Cr(Ⅵ)  

Separation and enrichment of Cr(Ⅵ)from microcrystalline phenolphthale-cetyltrimethyl ammonium bromide

作　　者：赵亚鹏 ZHAO Ya-peng(Jiyuan Municipal Center for Disease Control and Prevention,Jiyuan,Henan 459000,China)

机构地区：[1]济源市疾病预防控制中心,河南济源459000

出　　处：《中国卫生检验杂志》2021年第15期1807-1810,共4页Chinese Journal of Health Laboratory Technology

基　　金：河南省高等学校重点科研项目(16B150008)。

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Cr(Ⅵ)的新方法。方法在含Cr(Ⅵ)25μg的溶液中,分别加入一定量的1.0×10^(-2) 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10 ml,加入适量的盐,振荡摇匀2 min后静置一段时间,黄色沉淀悬浮于液面上,测定下层溶液中剩余的Cr(Ⅵ),计算Cr(Ⅵ)的浮选率。结果一定条件下,Cr(Ⅵ)可与CTMAB形成疏水性的离子缔合物,该缔合物可被均匀分布在溶液中的微晶酚酞吸附,盐析效应使得沉淀析出,实现Cr(Ⅵ)的分离富集。在最优的实验条件下,Cr(Ⅵ)的浮选率达到92.5%~96.8%。结论该方法简单、快速、条件易于控制,有望用于生产废水中Cr(Ⅵ)的处理和水样中六价铬的监测。Objective A novel method for the separation and enrichment of trace Cr(Ⅵ)with microcrystalline phenolphthalein by cetyltrimethylammonium bromide(CTMAB)was developed in the paper.Methods In the solution containing 25μg of Cr(Ⅵ),a certain amount of 1.0×10^(-2) mol/L CTMAB solution and buffer solution were added,then 7%phenolphthalide ethanol solution was added drop by drop,water was added to a constant volume of 10 ml,an appropriate amount of salt was added,the solution was shaken for 2 min,and then stood for a period of time.The yellow precipitate was suspended on the liquid surface,and the residual Cr(Ⅵ)in the lower solution was determined,and the flotation rate of Cr(Ⅵ)was calculated.Results Cr(Ⅵ)can react with CTMAB to form ion-association complex,which can be adsorbed on the surface of microcrystalline phenol⁃phthalein.As a result,Cr(Ⅵ)was quantitatively enriched on microcrystalline phenolphthalein.Under the optimal conditions,the enrichment yield was within 92.5%~96.8%.Conclusion The developed method appears to be simple,fast and easy-controlling.It is expected to be used for the treatment of Cr(Ⅵ)in wastewater and the monitoring of Cr(Ⅵ)in water samples.

关 键 词：微晶酚酞 铬 分离 

分 类 号：O655[理学—分析化学]