کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5409531 | 1506547 | 2016 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
On the interaction of N-acetylcysteine with Pb2Â +, Zn2Â +, Cd2Â + and Hg2Â +
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: On the interaction of N-acetylcysteine with Pb2Â +, Zn2Â +, Cd2Â + and Hg2Â + On the interaction of N-acetylcysteine with Pb2Â +, Zn2Â +, Cd2Â + and Hg2Â +](/preview/png/5409531.png)
چکیده انگلیسی
The binding ability of N-acetylcysteine (NAC) towards Pb2 +, Zn2 +, Cd2 + and Hg2 + metal cations was studied by potentiometry, UV spectrophotometry and 1H NMR spectroscopy. For all the systems, very similar speciation models were obtained, with the formation of ML0, ML22 â and ML(OH)â species. Their stability was found to be quite different: as an example, at I = 0.1 mol·Lâ 1 and t = 25 °C, logβ (ML0) = 32.11, 7.21, 6.53 and 5.52 for Hg2 +, Pb2 +, Cd2 + and Zn2 +, respectively. The speciation models and the coordination mode of the complexes formed were discussed on the basis of spectroscopic results. The sequestering ability of NAC towards metal cations was evaluated by determining the concentration of the ligand able to complex half of the metal ion fraction (pL0.5). The values such obtained were very different, ranging from a maximum of 12.4 for Hg2 + to a minimum of 3.7 for Zn2 + (at pH = 7.4 and I = 0.15 mol·Lâ 1), following the order: Hg2 + â«Â Pb2 + > Cd2 + > Zn2 +.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Liquids - Volume 223, November 2016, Pages 360-367
Journal: Journal of Molecular Liquids - Volume 223, November 2016, Pages 360-367
نویسندگان
Paola Cardiano, Claudia Foti, Ottavia Giuffrè,