کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7148879 | 1462105 | 2013 | 36 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
High sensitivity adsorptive stripping voltammetric method for antimony(III) determination in the presence of quercetin-5â²-sulfonic acid. Substituent effect on sensitivity
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
A high sensitivity method for voltammetric determination of Sb(III) using quercetin-5â²-sulfonic acid (QSA) as complexing and adsorbing agent is presented. The Sb-QSA is accumulated on the electrode surface and then reduced at about â0.67 V. Optimal analytical conditions were pH: 5.5, CQSA: 3.0 μmol Lâ1, Eads: â0.10 V and tads: 60 s. The detection limit (3Ï) depends on accumulation time, reaching 3.6 ng Lâ1 and 1.6 ng Lâ1 with tads of 60 s and 180 s, respectively. Peak current is proportional to Sb(III) concentration up to 10.0 μg Lâ1 and 1.5 μg Lâ1 with tads of 60 s and 180 s, respectively. The relative standard deviation were 1.7% and 2.5% for a solution containing 1.0 μg Lâ1 and 5.0 μg Lâ1 of Sb(III), respectively (n = 10). Interference by other metal ions was studied. The proposed method was applied to the determination of antimony in natural and spiked water samples, with satisfactory results. The method was designed in order to compare the sensitivity of the methods that use quercetin and the sulfonic derivative.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Sensors and Actuators B: Chemical - Volume 185, August 2013, Pages 560-567
Journal: Sensors and Actuators B: Chemical - Volume 185, August 2013, Pages 560-567
نویسندگان
Carlos Rojas, Verónica Arancibia, Marisol Gómez, Edgar Nagles,