کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10559096 | 969218 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Determination of mercury in gasoline by cold vapor atomic absorption spectrometry with direct reduction in microemulsion media
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Determination of mercury in gasoline by cold vapor atomic absorption spectrometry with direct reduction in microemulsion media Determination of mercury in gasoline by cold vapor atomic absorption spectrometry with direct reduction in microemulsion media](/preview/png/10559096.png)
چکیده انگلیسی
The determination of Hg in gasoline by cold vapor atomic absorption spectrometry, after direct aqueous NaBH4 reduction in a three-component (microemulsion) medium, was investigated. Microemulsions were prepared by mixing gasoline with propan-1-ol and 50% v / v HNO3 at a 20 : 15 : 1 volume ratio. A long-term homogeneous system was immediately formed this way. After reduction, the Hg vapor generated in a reaction flask was transported to an intermediate K2Cr2O7/H2SO4 trap solution in order to avoid poisoning of the Au-Pt trap by the gasoline vapors. A second reduction step was then conducted and the generated Hg vapor transported to the Au-Pt trap, followed by thermal release of Hg0 and atomic absorption measurement. Purified N2 was used as purge and transport gas. After multivariate optimization by central composite design calibration graphs showed coefficients of correlation of 0.9999 and a characteristic mass of 2 ng was obtained. Typical coefficients of variation of 5% and 6% were found for ten consecutive measurements at concentration levels of 1 and 8 μg Lâ1 of Hg2+, respectively. The limit of detection was 0.10 μg Lâ1 (0.14 μg kgâ1) in the original sample. A total measurement cycle took 11 min, permitting duplicate analysis of 3 samples per hour. The results obtained with the proposed procedure in the analysis of commercial gasoline samples were in agreement with those obtained by a comparative procedure. Gasoline samples of the Rio de Janeiro city have shown Hg concentrations below 0.27 μg Lâ1.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Spectrochimica Acta Part B: Atomic Spectroscopy - Volume 60, Issue 5, 30 June 2005, Pages 625-631
Journal: Spectrochimica Acta Part B: Atomic Spectroscopy - Volume 60, Issue 5, 30 June 2005, Pages 625-631
نویسندگان
Geisamanda Pedrini Brandão, Reinaldo Calixto de Campos, Aderval Severino Luna,