کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1165442 1491062 2013 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Determination of aminopolycarboxylic acids in river water by solid-phase extraction on activated charcoal cartridges and gas chromatography with mass spectrometric detection. Method performance characteristics and estimation of the uncertainty
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Determination of aminopolycarboxylic acids in river water by solid-phase extraction on activated charcoal cartridges and gas chromatography with mass spectrometric detection. Method performance characteristics and estimation of the uncertainty
چکیده انگلیسی

A new sample preparation procedure to determine aminopolycarboxylic acids (ethylenediaminetetraacetic acid, EDTA, nitrilotriacetic acid, NTA, diethylenetriaminepentaacetic acid, DTPA, and cyclohexanediaminetetraacetic acid, CDTA) in river water is described. The procedure consists of the solid-phase extraction of the aminopolycaroxyllic acids on activated charcoal cartridges after increasing the ionic strength and acidifying the sample. The extract was eluted with methanol and the analytes were methylated in presence of BF3/methanol to determine them by GC with mass spectrometric detection. Recoveries were higher than 90% with good repeatabilities and inter-day precision for concentrations close to quantification limits (about 10 μg L−1) and higher. It has been verified that the proposed method is robust according to the Youden and Steiner test and free of matrix effects arisen from the presence of organic matter and iron(III) as deduced from statistical tests. A bottom-up approach was followed to estimate the uncertainty of the measured concentration. At concentrations close to 10 μg L−1 the most relevant step of the method is the calculus of the interpolated concentration which has a high value of relative standard uncertainty.

Figure optionsDownload as PowerPoint slideHighlights
► SPE of aminopolycarboxylic acids without preparing iron complexes is studied.
► Adjusting water sample conditions the retention on activated charcoal is feasible.
► There is not any significant matrix-effect in the quantification by GC/MS.
► Method performance characteristics are given. Robustness and uncertainty are evaluated.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Analytica Chimica Acta - Volume 770, 3 April 2013, Pages 94–102
نویسندگان
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