Amperometric sensing of nitrite based on electroactive ferricyanide-poly(diallyldimethylammonium)-alginate composite film

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• 作者：Cong QinAuthor Vitae ; Wen WangAuthor Vitae ; Chao ChenAuthor Vitae ; Lijuan BuAuthor Vitae ; Ting WangAuthor Vitae ; Xiaoli SuAuthor Vitae ; Qingji Xie ; ^{xieqj@hunnu.edu.cn}Author Vitae ; Shouzhuo YaoAuthor Vitae
• 关键词：Poly(diallyldimethylammonium) ; Alginate ; Robust immobilization of ferricyanide ; Electroactive composite ; Electrocatalysis-based amperometric nitrite sensing
• 刊名：Sensors and Actuators B: Chemical
• 出版年：2013
• 出版时间：May, 2013
• 年：2013
• 卷：181
• 期：Complete
• 页码：375-381
• 全文大小：676 K

文摘

Poly(diallyldimethylammonium chloride) (PDDA) and sodium alginate (AlgNa) were mixed to obtain a water-insoluble interpenetrating polymer composite via electrostatic interaction and then cast on an Au electrode surface, followed by robust immobilization of K₃Fe(CN)₆ to yield a K₃Fe(CN)₆-PDDA-Alg/Au electrode of stable electroactivity. The interaction processes and electrode modification are studied by visual inspection and electrochemical methods. Under optimized conditions, the K₃Fe(CN)₆-PDDA-Alg/Au electrode can efficiently electrocatalyze the reduction of nitrite in acidic aqueous solution and give a linear nitrite-detection range of 5.0 ¦ÌM to 9.7 mM with a sensitivity of 83.7 ¦ÌA cm^?2 mM^?1, which is amongst the best results reported for nitrite sensing. The electrode was also used for nitrite electroanalysis in real sample matrices with satisfactory results.