高等学校化学学报

高等学校化学学报 ›› 1991, Vol. 12 ›› Issue (3): 329.

• 论文 • 上一篇    下一篇

单扫示波极谱法测定痕量亚硝酸根

高志强, 李培标, 赵藻藩   

  1. 武汉大学化学系, 430072
  • 收稿日期:1989-10-05 出版日期:1991-03-24 发布日期:1991-03-24
  • 通讯作者: 高志强

Determination of Trace Nitrite by Single Sweep Polarography

Gao Zhi-qiang, Li Pei-biao, Zhao Zao-fan   

  1. Department of Chemistry, Wuhan University, Wulum, 430072
  • Received:1989-10-05 Online:1991-03-24 Published:1991-03-24

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摘要： 在前文的基础上,经进一步研究发现,在Co3+-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。

关键词: 络合物, 极谱法, 亚硝酸根, 硫氰酸根, 钴离子

Abstract: 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 NOin the adsorbed complex compound to hydroxylamine. The linear range of the polarographic wave is from 1×10-8to 8×10-7mol/Land the detection limit is 5×10-9mol/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.

Key words: Complex, Polarography, Nitrite, Thiocyanate, Cobaltous ion

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