کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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742146 | 1462109 | 2013 | 6 صفحه PDF | دانلود رایگان |
A simple, highly sensitive square-wave voltammetric method is reported for the sensing of paraquat (PQ) in natural water samples. A glassy carbon electrode modified with functionalized multiwalled carbon nanotubes (MWCNTs) immobilized within a Dihexadecylhydrogenphosphate (DHP) film was prepared and characterized with cyclic, differential-pulse and square-wave voltammetry. The modified electrode was found to exhibit a remarkably enhanced electro-activity toward the sensing of paraquat. Under optimum experimental conditions, using square wave voltammetry, the sensing of paraquat is achievable over the concentration range from 5.0 × 10−8 to 1.5 × 10−6 mol L−1 with a detection limit (3σ) of 1.0 × 10−8 mol L−1. The protocol is explored toward potential interferents and is applied for the analysis of paraquat in natural waters with the results agreeing with independently verified HPLC at a 95% confidence level.
Journal: Sensors and Actuators B: Chemical - Volume 181, May 2013, Pages 306–311