摘要
在前文的基础上,经进一步研究发现,在Co^(3+)-SCN^--抗坏血酸介质中(pH=2),也可得到灵敏的亚硝酸根的极谱还原波,并对该波的机理进行了初步的研究。 1 实验部分 1。1 仪器和试剂 JP-2型示波极谱仪(成都仪器厂),三电极系统;PAR-370电化学系统(美国PAR公司),M303型静汞滴电极(SMDE);501型超级恒温水浴(25±0.2℃)。高纯二氧化碳除氧。
In acidic medium(pH = 2), there is a well-defined single sweep polarographic wave of nitrite complex containing NO which can be used for determining trace nitrite. The complex can be strongly adsorbed on the surface of the mercury electrode, the polarographic wave is attributed to the reduction of NO in the adsorbed complex compound to hydroxylamine. The linear range of the polarographic wave is from 1×10-8 to 8×10-7 mol/L and the detection limit is 5×10-9 mol/L. Most common ions show no or a little effect on the determination. This method is applied to the analysis of water, foods and nitrate samples.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1991年第3期329-331,共3页
Chemical Journal of Chinese Universities
关键词
亚硝酸根
极谱法
单扫示波
痕量
Complex, Polarography, Nitrite, Thiocyanate, Cobaltous ion
