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本文首次采用 Nafion和 Co(salen) /Nafion修饰铂电极测定海水中的 NO,对实验条件进行了选择 ,确定了最佳实验条件 ,即反应池通氮除氧 30 min,富集时间为 4min。同时用线性扫描法对海水中的 NO进行测定 ,测得海水中 NO的浓度与氧化峰电流之间有一定线性关系。对 Nafion修饰电极而言 ,线性范围 1～ 76.9μmol/L,R2 =0 .991 6,检出限为 1 μmol/L。同时对 2种方法修饰的铂电极进行了比较 ,即当 NO浓度在 1 0 -6mol/L数量级时 2种电极基本上无差别 ,而在 1 0 -7mol/L数量级时 Co(salen) /Nafion修饰电极要明显优于 Nafion修饰电极
In this paper, the NO in seawater was first determined by the Nafion and Co (salen) / Nafion modified platinum electrodes. The experimental conditions were selected and the optimum experimental conditions were determined, that is, the reaction tank was deoxygenated for 30 min with nitrogen and the enrichment time was 4 min. At the same time, the linear sweep method was used to determine NO in seawater. There was a linear relationship between NO concentration in seawater and oxidation peak current. For Nafion modified electrode, the linear range of 1 ~ 76.9μmol / L, R2 = 0.991 6, the detection limit of 1μmol / L. At the same time, two kinds of modified platinum electrodes were compared, that is, the two kinds of electrodes are basically indifferent when the NO concentration is in the order of 10-6mol / L, and the difference between Co (salen) / Nafion The modified electrode is obviously better than the Nafion modified electrode