甲壳素修饰碳糊电极测定亚硝酸根  

Determination of Trace Nitrite with a Chitin Containing Carbon Paste Electrode

作　　者：兰雁华[1] 陆光汉[1] 吴晓刚[1] 姚胜来[1] 宋丰[1] 许汉英[1] 

机构地区：[1]华中师范大学化学系

出　　处：《分析试验室》1999年第1期27-30,共4页Chinese Journal of Analysis Laboratory

基　　金：湖北省自然科学基金

摘　　要：报道了一种对ＮＯ－２具有高灵敏度和选择性的碳糊化学修饰电极。该电极由碳粉中加入修饰剂甲壳素制备而成。采用酸性Ｂｒｉｔｏｎ－Ｒｏｂｉｎｓｏｎ广泛缓冲溶液（ｐＨ３．９０）为支持电解质，用１．２×１０－４ｍｏｌ／Ｌ十六烷基三甲基溴化铵（ＣＴＭＡＢ）作吸附剂，对亚硝酸根离子进行阳极溶出伏安法测定，检测限为１．０×１０－９ｍｏｌ／Ｌ。在量浓度为２．０×１０－９～２．０×１０－７ｍｏｌ／Ｌ范围内，峰电流与浓度具有线性关系。此修饰电极可直接富集和测定水样中亚硝酸根的含量，大多数离子对测定无干扰，回收率为９６．０％～１１０．０％。This paper reports a new chemically modified electrode for determining nitrite with high sensitivity and selectivity.The electrode is constructed by adding chitin into a carbon paste mixture.This method is based on the electrodeposition and subsequent oxidation of CTMAB nitrite complex on the CME in a supporting electrolyte solution consisting of Britton Robinson buffer solution of pH value 3.90 and 1.2×10 -4 mol/L CTMAB.The peak current is directly proportional to the concentration of nitrite over the range 2.0×10 -9 ～2 0×10 -7 mol/L, and the detection limit is 1.0×10 -9 mol/L.The modified electrode preferentially accumulates nitrite from the solution,while most ions do not interfere with the determination.This method has been used for the determination of trace nitrite in water with 96.0%～110 0% recovery

关 键 词：亚硝酸根 化学修饰 碳糊电极 伏安法 测定 

分 类 号：O613.61[理学—无机化学]