A novel sensor for the detection of acetamiprid in vegetables based on its photocatalytic degradation compound

卷:194

Jin, Dangqin ; Xu, Qin ; Yu, Liangyun ; Mao, Airong ; Hu, Xiaoya

Yangzhou Univ

关键词: Electrochemical sensor;    Acetamiprid;    6-Chloronicotinic acid;    Titanium dioxide;    Photocatalytic degradation;   

DOI  :  10.1016/j.foodchem.2015.08.118

学科分类：食品科学和技术

【 摘 要 】

An electrochemical method for the indirect determination of acetamiprid was studied, using titanium dioxide photocatalysts coupled with a carbon paste electrode. The cyclic voltammetric results indicated that the photocatalytic degradation compound of acetamiprid had electroactivity in neutral solutions. The amount of acetamiprid was further indirectly determined by differential pulse anodic stripping voltammetric analysis as a sensitive detection technique. The experimental parameters were optimized with regard to the photocatalytic degradation time, pH of buffer solution, accumulation potential and accumulation time. Under optimal conditions, the proposed electrochemical method could detect acetamiprid concentrations ranging from 0.01 to 2.0 mu M, with a detection limit (3 S/N) of 0.2 nM. Moreover, the proposed method displays excellent selectivity, good reproducibility, and acceptable operational stability and can be successfully applied to acetamiprid determination in vegetable samples with satisfying results. (C) 2015 Elsevier Ltd. All rights reserved.