کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
584220 | 1453181 | 2007 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Electrochemical studies and square wave voltammetry of paraquat at natural phosphate modified carbon paste electrode
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بهداشت و امنیت شیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
A square wave voltammetry (SWV) method for the determination of trace amounts of paraquat at carbon paste electrode modified with natural phosphate (NP-CPE) is proposed. Paraquat was accumulated onto natural phosphate at open circuit potential from aqueous solution. The reduction peaks of paraquat were observed around â0.7 V and â1.0 V (versus SCE). The response of paraquat at NP-CPE related to: the concentration of this herbicide, preconcentration time, natural phosphate loading and measuring solution pH, was investigated. It was observed that the increase of the cathodic peak currents using SWV, under the optimized condition, is linear with the increase of paraquat concentration in the range from 2.3 Ã 10â8 mol Lâ1 to 300 Ã 10â8 mol Lâ1. The detection limit (DL, 3S.D.) and quantification limit (QL, 10S.D.) for peak 1 were about 7.8 Ã 10â10 mol Lâ1 and 2.59 Ã 10â9 mol Lâ1, respectively, in pure electrolyte water with the relative standard deviation of 1.8% (n = 7). The proposed method was successfully applied to the determination of paraquat in real water samples with satisfactory results.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 145, Issues 1â2, 25 June 2007, Pages 1-7
Journal: Journal of Hazardous Materials - Volume 145, Issues 1â2, 25 June 2007, Pages 1-7
نویسندگان
M.A. El Mhammedi, M. Bakasse, A. Chtaini,