کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5467300 | 1518611 | 2017 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Measurements of δ11B in water by use of a mass spectrometer with accelerator
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سطوح، پوششها و فیلمها
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چکیده انگلیسی
This study describes the tests carried out to measure the isotopic composition of Boron (B) in water samples by use of the magnetic spectrometer and accelerator of the Center for Isotopic Research on Cultural and Environmental heritage (CIRCE) of Italy. B was extracted from water samples to obtain Boric acid (B(OH)3), which was then analyzed. We quantified the precision of our experimental system and the variability introduced by the chemical extraction measuring chemically untreated and treated pure B(OH)3 samples. We found an instrumental precision around 10â° (1Ï), but, by increasing the number of replicates (>30), we obtained a standard deviation of the mean (Ïerr) around 3â° or lower. We also tested whether the chemical extraction caused isotopic fractionation and found a small fractionation (ε = 5 ± 4â°) of treated samples normalized against untreated ones, compatible with zero at 2Ï. In order to avoid δ11B biases, we decided to normalize unknown treated samples with treated standards. Finally, we measured δ11B of seawater and groundwater samples to test the analytical method, and obtained values of 30 ± 6â° and â4 ± 4â° respectively. We conclude that our experimental system is only suitable when remarkable (>10â°) δ11B differences exist among water samples, but cannot be used to measure natural differences (<10â°) unless the total uncertainty is significantly decreased.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms - Volume 412, 1 December 2017, Pages 109-114
Journal: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms - Volume 412, 1 December 2017, Pages 109-114
نویسندگان
Egidio Di Fusco, Mauro Rubino, Fabio Marzaioli, Brunella Di Rienzo, Luisa Stellato, Andreina Ricci, Giuseppe Porzio, Antonio D'onofrio, Filippo Terrasi,