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.
出处
《分析试验室》
CAS
CSCD
北大核心
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)
关键词
丙醇
萃取浮选
Cu(Ⅱ)
硫氰酸根
Propyl alcohol
Extraction-flotation
Copper（ Ⅱ ）
Thiocyanate
