摘要
在含有５０％乙醇，２０×ｌ０￣－５ｍｏｌ／Ｌ１－（２－吡啶偶氮）－２－萘酚（ＰＡＮ）的０．１ｍｏｌ／ＬＮＨ＿４Ａｃ缓冲溶液（ｐＨ７．２）中，Ｎｉ（Ⅱ）－ＰＡＮ络合物在单扫示波极谱仪上产生一灵敏的导数极谱波，峰电位在－０．６５ｖ（ｖｓＳＣＥ），峰电流与Ｎｉ（Ⅱ）浓度在３．０×１Ｏ￣－９～４．０×１０￣－６ｍｏｌ／Ｌ范围内呈线性关系，检测限达２×１Ｏ￣－９ｍｏｌ／Ｌ。机理研究表明，峰电流是由吸附在电极表面的络合物中的ＰＡＮ经不可逆还原而产生的。方法已应用于钢中镍的测定，结果满意。
A sensitive adsorptive wave of nickel （Ⅱ）－PAN complex was obtained by using single-sweep polarography in 0．1mol/L NH_4Ac buffer solution containing 50％ ethanol,at pH 7．2．The peak potential is -0．65V（vs．SCE）．The peakheight is proportional to the concentration of nickel （Ⅱ）over the range 3．0×l0^-9 -4．0×l0^-6mol/L．The linit of detection is as low as 2×10^-9mol/L．The mechanism of the electrode reaction was found to be the irreversible reduction of PAN in the complex adsorbed on the surface of the mercury electrode．The．method has been applied to the determination of nickel in steel samples with satisfactory results．
出处
《冶金分析》
CAS
CSCD
北大核心
1995年第3期13-16,共4页
Metallurgical Analysis
