丙醇-水体系萃取浮选铜间接测定硫氰酸根  

Indirect determination of thiocyanate by extraction-flotation of copper with propyl alcohol-water system

作　　者：卫伟[1] 钱予华[1] 李全民[1] 刘国光[1] 

机构地区：[1]河南师范大学化学与环境科学学院河南省环境污染控制重点实验室

出　　处：《分析试验室》2007年第1期1-4,共4页Chinese Journal of Analysis Laboratory

基　　金：河南省自然科学基金资助项目(984031300);河南省创新人才工程项目(教高[2001]513号)

摘　　要：试验表明，在SCN^-存在下，Cu（Ⅱ）能被抗坏血酸还原为Cu（Ⅰ），Cu（Ⅰ）与SCN^-形成CuSCN沉淀，该沉淀在丙醇与水分相过程中，能很好的浮选于丙醇，水界面之间，通过测定Cu（Ⅱ）浮选率，能间接测定SCN^-的量，据此建立了测痕量SCN^-的新方法，多数常见阴、阳离子不干扰测定。测定的线性范围为3．0×10^-6～7．8×10^-5mol／L，检出限为1．5×10^-6mol／L，回收率为95．7％～103％。用于尿样与唾液中SCN^-的测定。The experiments indicate that Cu（ Ⅱ ） can be reduced to Cu（ Ⅰ ） by ascorbic acid in the presence of SCN^- and Cu（ Ⅰ ） is precipitated with SCN^- . In the course of phase separation of propyl alcohol from water, the precipitated CuSCN stays at the interface of propyl alcohol and water. The amount of SCN^- can be determined indirectly by mensuring the flotation yield of Cu（ Ⅱ ）. A novel method for the determination of the trace amount of SCN^- is established based on the experiments. The result was not interfered by the majority of ordinary cations and anions. The li- near range is 3.0×10^-6 -7.8× 10^-5 mol/L, and the detection limit is 1.5 × 10^-6 mol/L. The recovery is 95.7 - 103%. The method was succeccessfully applied to the determination of thiocyanate in urine and saliva and the result was satisfactory.

关 键 词：丙醇 萃取浮选 Cu(Ⅱ) 硫氰酸根 

分 类 号：O652.6[理学—分析化学]