کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10529025 | 960770 | 2005 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Optimization of 210Pb determination via spontaneous deposition of 210Po on a silver disk
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
The accuracy of 210Pb determination via spontaneous deposition of 210Po on a silver disk and alpha spectrometric measurement was examined. The study focused on the storage conditions of the polonium-containing solutions, the tracer used in polonium analysis and the effect of storage time and acid concentration on 210Po deposition. The intermediate precision and repeatability associated with the improved 210Pb analysis of fresh groundwater samples was 5 and 14%, respectively. These improved values were achieved by using glass bottles as storage containers for the solution remaining from the first 210Po deposition, by rinsing the sample container with concentrated hydrochloric acid after storage and by using different isotopes of polonium as the yield determinant tracer in the first and the second deposition. Less polonium adsorption onto the storage container walls occurred with HCl than with HNO3. The overall uncertainty in 210Pb analysis was (11 ± 7)% at the 95% confidence level. The minimum detectable activity concentration was 0.1 mBq lâ1 calculated from blank samples and 0.05 mBq lâ1 using the background counts of the alpha spectrometer.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Analytica Chimica Acta - Volume 545, Issue 2, 27 July 2005, Pages 252-261
Journal: Analytica Chimica Acta - Volume 545, Issue 2, 27 July 2005, Pages 252-261
نویسندگان
P. Vesterbacka, T.K. Ikäheimonen,