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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％。
A carbon paste chemically modified electrode with high sensitivity and selectivity to NO-2 was reported. The electrode is prepared by adding a modifier chitin in the toner. Using acidic Briton-Robinson broad buffer solution (pH3.90) as the supporting electrolyte, with 1.2 × 10-4mol / L cetyltrimethylammonium bromide (CTMAB) as adsorbent for nitrite ion Anodic stripping voltammetry, the detection limit of 1.0 × 10-9mol / L. In the concentration range of 2.0 × 10-9 ~ 2.0 × 10-7mol / L, the peak current has a linear relationship with the concentration. The modified electrode can directly enrich and determine the content of nitrite in the water sample, and most ions have no interference with the determination. The recovery rate is 96.0% ~ 110.0%.