摘要
本文提出,锢镉与巯基乙酸、联吡啶在pH=3.6配合物所产生的吸附波。其峰电位分别为-0.67伏-0.73伏(vs SCE)。一定量的碲(Ⅳ)加入可以使铟峰电流再提高三倍以上。测定镉铟最佳条件为0.005％巯基乙酸-0.001％联吡啶。采用巯基棉柱分离可以消除共存离子干扰。用本法测定工业废水中痕铟镉,获得较为满意的结果。
In a buffer solution of HAc-NaAc (pH=3.6) containing 0.005％ thioylycollic acid, 0.001％ 2,2-dipyridyl, 0.01％ diphenylquanidine and 20mg tellurium (Ⅳ)/10ml, two sensitive waves appear at-0.67V and -0.73V (vs SCE), related to the concentration of Cd and In respectively. The height of wave at -0.67V is directly proportional to the concentration of Cd in the range of 6×10^(-9)-4×10^(-7) mol/L with detection limit of 3×10^(-9) mol/L, and so does the wave at -0.73V to the concentration of In in the range of 2.5×10^(-9)-3×10^(-7) mol/L with detection limit of 1.2×10^(-9). Most common anions and [cations have no effect on the determination of In and Cd. This method has been used to the determination of In and Cd in the industrial wastewater with satisfactory results.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
1989年第3期276-278,共3页
Chinese Journal of Analytical Chemistry
