کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9743918 | 1491202 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Evaluation of a synergetic effect between Rh as permanent chemical modifier and acetylacetone as complexing agent in Sc determination in sediment slurry samples by ETAAS
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کلمات کلیدی
Scandium - اسکاندیمSynchrotron radiation X-ray fluorescence - اشعه ماوراء بنفش اشعه ماوراء بنفشPermanent chemical modifier - اصلاح کننده شیمیایی دائمیElectrothermal Atomic Absorption Spectrometry - طیف سنجی جذب اتمی الکتروترمالComplexing agent - عامل پیچیدهScanning electron microscopy - میکروسکوپ الکترونی روبشی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
In the present work, scandium was determined in sediment slurry samples (from three different rivers) by electrothermal atomic absorption spectrometry (ETAAS). Slurries were prepared by weighting 100 mg of dry sediment samples (â¤53 μm particle sizes) and adding 6 ml of HCl:HNO3:HF (3:1:2, v/v). Accurate results were only possible due to the synergetic effect between Rh as permanent chemical modifier and acetylacetone (Acac) as complexing agent. The same platform was used for 400 heating cycles. The performance of the chemical modification was evaluated by using scanning electron microscopy (SEM), synchrotron radiation X-ray fluorescence (SRXRF) and some figures of merit (precision and detectability). The best analytical conditions were attained using 1500 and 2550 °C as pyrolysis and atomization temperatures. The scandium content in the liquid phase of the slurries ranged from 61 to 73%, thus indicating, in this study, that both liquid and solid phases play an important role in slurry analyses. An amount of 5.0-20.0 μg lâ1 Sc linear range as well as LOD and LOQ of 0.19 and 0.62 μg lâ1, respectively, were obtained under these conditions. The accuracy was checked by using microwave-assisted decomposition, and the results compared to those obtained with the proposed methodology (slurry analysis). By checking both sets of the results, there is no statistical difference at the 95% confidence levels.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Analytica Chimica Acta - Volume 530, Issue 2, 14 February 2005, Pages 299-305
Journal: Analytica Chimica Acta - Volume 530, Issue 2, 14 February 2005, Pages 299-305
نویسندگان
Araceli Verónica Flores, Carlos Alberto Pérez, Marco Aurélio Zezzi Arruda,