کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1168938 960612 2008 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Sensitive determination of cadmium in water samples by room temperature ionic liquid-based preconcentration and electrothermal atomic absorption spectrometry
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Sensitive determination of cadmium in water samples by room temperature ionic liquid-based preconcentration and electrothermal atomic absorption spectrometry
چکیده انگلیسی

A sensitive preconcentration methodology for Cd determination at trace levels in water samples was developed in this work. 1-Butyl-3-methylimidazolium hexafluorophosphate ([C4MIM][PF6]) room temperature ionic liquid (RTIL) was successfully used for Cd preconcentration, as cadmium-2–(5-bromo-2-pyridylazo)-5-diethylaminophenol complex [Cd–5-Br-PADAP]. Subsequently, Cd was back-extracted from the RTIL phase with 500 μL of 0.5 mol L−1 nitric acid and determined by electrothermal atomic absorption spectrometry (ETAAS). A preconcentration factor of 40 was achieved with 20 mL of sample. The limit of detection (LOD) obtained under optimum conditions was 3 ng L−1 and the relative standard deviation (R.S.D.) for 10 replicates at 1 μg L−1 Cd2+ concentration level was 3.5%, calculated at peak heights. The calibration graph was linear from concentration levels near the detection limits up to at least 5 μg L−1. A correlation coefficient of 0.9997 was achieved. Validation of the methodology was performed by standard addition method and analysis of certified reference material (CRM). The method was successfully applied to the determination of Cd in river and tap water samples.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Analytica Chimica Acta - Volume 628, Issue 1, 17 October 2008, Pages 41–48
نویسندگان
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