کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1242675 | 1645368 | 2010 | 6 صفحه PDF | دانلود رایگان |

We report the benefit of using an optimized composite electrode, based on a multiwall carbon nanotubes and epoxy resin, as working electrode in an automated flow system. The optimal composite electrode composition consists in a 10% carbon nanotubes and 90% epoxy resin. This composition provides lower limit of detection and increases the stability and reproducibility of the analytical signal compared to the 20% conventional composition electrodes. Moreover, the standard solutions are on-line prepared with an automated flow system. The integration of the developed carbon nanotube electrodes in the proposed flow system provides a highly sensitive analyzer for free chlorine determination in water down to the 20 μg L−1. The working range was found to be 0.02–4 mg L−1 with an analysis time of 60 s. The system sensitivity was maintained into the control limits (±2σ) for one month, with a mean value of −0.146 (±0.008) μA L mg−1. Validation of the analytical system has been performed by the successful determination of free chlorine in tap water and swimming pools water samples.
Journal: Talanta - Volume 81, Issues 4–5, 15 June 2010, Pages 1593–1598