کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9743461 | 1491191 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Square-wave adsorptive stripping voltammetry for the determination of cyclofenil after photochemical derivatization
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Square-wave adsorptive stripping voltammetry for the determination of cyclofenil after photochemical derivatization Square-wave adsorptive stripping voltammetry for the determination of cyclofenil after photochemical derivatization](/preview/png/9743461.png)
چکیده انگلیسی
Square-wave adsorptive voltammetry was applied for the determination of cyclofenil at ultra-trace levels. Due to the unstable behavior of cyclofenil, the analyte photochemical derivative was used for quantification. This stable analyte photoderivative was pre-concentrated (30 s accumulation time) on the hanging mercury drop electrode (HMDE), using Britton-Robinson buffer (pH 9) as the supporting electrolyte. Under these conditions, the cyclofenil photoderivative presented one reduction peak maximum at â1280 mV. Instrumental and experimental parameters were carefully optimised. Limit of detection of 1.5 Ã 10â8 mol lâ1, was achieved with a linear dynamic range from 5 Ã 10â8 to 6 Ã 10â6 mol lâ1. This analytical approach was tested through the analysis of one commercial pharmaceutical formulation and analyte spiked urine samples. While no interferences were observed for the analysis of the pharmaceutical tablet, urine samples imposed interferences that were corrected by using the analyte addition technique. Recovery tests enabled results from 93.6 to 106.5%. Repeatability of the measurements was below 7% at 1 Ã 10â6 mol lâ1 concentration level.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Analytica Chimica Acta - Volume 549, Issues 1â2, 6 September 2005, Pages 67-73
Journal: Analytica Chimica Acta - Volume 549, Issues 1â2, 6 September 2005, Pages 67-73
نویسندگان
Wagner F. Pacheco, Pércio A.M. Farias, Ricardo Q. Aucelio,