کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
691544 | 1460430 | 2014 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Electrochemical determination of mercury(II) in ambient water at palladium oxide/graphite composite electrodes Electrochemical determination of mercury(II) in ambient water at palladium oxide/graphite composite electrodes](/preview/png/691544.png)
• The palladium oxides was supported onto natural phosphate using solid reaction.
• The palladium oxides was used as modifier of carbon (PdO/NP-CPE) to determine mercury using DPASV.
• The influence of the chemical and electrochemical variables was investigated.
• The proposed electrode exhibits excellent electrocatalytic activity to determine mercury.
The voltammetric behavior of mercury was investigated using carbon paste electrode modified with a palladium oxide supported onto natural phosphate (PdO/NP-CPE). The aim of this work is to optimize all factors influencing this determination (frequency, amplitude, pulse height, deposition time and potential, heated temperature and charge loading of palladium oxide). The best results were obtained with square wave potential in 0.1 mol/L HCl medium. Linear dependence of current versus mercury(II) concentrations, under optimized conditions, was obtained for the concentration ranges from 2.5 × 10−7 to 1.0 × 10−4 mol/L. For 3 min preconcentration, detection limits of 1.93 × 10−8 mol/L was obtained at the signal noise ratio (SNR) of 3. The repeatability expressed as relative standard deviation (%R.S.D.) was always <4.78%.These results indicate clearly that using square wave voltammetry (SWV) with the PdO-doped natural phosphate–carbon composite electrode provides a real opportunity for detecting mercury(II) in ambient water solutions.
Journal: Journal of the Taiwan Institute of Chemical Engineers - Volume 45, Issue 5, September 2014, Pages 2725–2732