کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10543616 | 963524 | 2005 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Multicommutation hydride generation atomic fluorescence determination of inorganic tellurium species in milk
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
چکیده انگلیسی
A multicommutated flow system has been developed for hydride generation, atomic fluorescence (HG-AFS) determination of tellurate (TeVI) and tellurite (TeIV) in milk samples. After a batch leaching of Te by sonication at room temperature for 10 min with aqua regia, sample slurries in acidic medium were merged with sodium borohydride and HCl to obtain data on TeIV. Another portion of the acidic slurry was mixed with KBr and passed through a reaction coil introduced inside a microwave oven to reduce quantitatively TeVI to TeIV which was analyzed by HG-AFS. The detection limit was 0.57 ng gâ1 in the original samples. The linear range obtained was till 4 ng mlâ1 and the average recovery of different amounts of TeVI and TeIV added to real milk samples were 98 ± 4% and 98 ± 2%, respectively, indicating the absence of analyte losses or contaminations and original species modification. Average relative standard deviation of 6.3% was found for Te determination in a series of commercially available milk samples containing from 1.0 to 10.1 ng mlâ1 total Te. The proposed method provided a high sampling frequency of 24 hâ1 for the determination of both, free TeIV and total Te, in a same sample with a two times reduced waste generation and a four times reduced reagent consumption as compared with the continuous hydride generation. Additionally, the method developed requires a minimum operator attention and sample manipulation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Food Chemistry - Volume 91, Issue 1, June 2005, Pages 181-189
Journal: Food Chemistry - Volume 91, Issue 1, June 2005, Pages 181-189
نویسندگان
Eva Ródenas-Torralba, Ángel Morales-Rubio, Miguel de la Guardia,