示差脉冲伏安法测定水及酒中的氰化物  

Determination of Cyanide in Water and Wine by Differential Pulse Voltammetry

作　　者：吴敦虎[1] 孙其志[2] 张英[2] 

机构地区：[1]大连铁道学院应用化学系,大连116022 [2]长春地质学院岩矿测试及地球化学系

出　　处：《分析化学》1990年第6期557-559,共3页Chinese Journal of Analytical Chemistry

摘　　要：CN^--乙醇胺-镍(Ⅱ)-碳酸氢内-亚硫酸钠体系中,用悬汞电极,在-1.50--1.00V间阳极扫描,在示差脉冲极谱仪上,可获得一良好峰形极谱波,其波高与CN^-浓度在1～270μg/L范围内有良好线性关系,测定水和酒中氰化物,检测限为0.2μg/L,相对标准偏差小于6％,回收率在97.5～103.0％之间。对于ppb～ppm级的样品,结果和光度分析法对照,符合较好。该法直接测定水及酒中的氰化物,可不经蒸馏亦无明显干扰,方法简便、灵敏、可靠。A method for determination of trace cyanide in water and wine by differential pulse Voltammetry was proposed. A three electrode arrangement (hanging mercury drop electrode, platinum electtode and silver electrode) was applied to measure the catalytic current caused by the interaction between cyanide and 0. 5×10^(-3)mol/L Ni(Ⅱ)—4. 4×10^(-2)mol/L ethanolamine complex in 0. 026mol/L sodium bicarbonate and 0. 2 mol/L sodium nitrite buffer solution (pH 9. 8). The interference was not substabtial, though distillation was not carried out before the measurements. The experiments showed that the catalytic current has linear dependence on the concentration of cyanide in the range of 1～270μg/L. The method has the advantages of rapidity, simplicity and high sensitivity with the dection limit of 0. 2μg/L.

关 键 词：氰化物 水 酒 脉冲伏安法 

分 类 号：O661.1[理学—分析化学]