期刊
TALANTA
卷 116, 期 -, 页码 604-610出版社
ELSEVIER
DOI: 10.1016/j.talanta.2013.07.040
关键词
Arsenic; Layered double hydroxide; Nano-sorbent; Solid phase extraction; Electrothermal atomic absorption spectrometry; Water samples
资金
- Research Council of Azarbaijan Shahid Madani University (ASMU, Iran)
A selective solid phase extraction method, based on nano-structured Mg-Al-Fe(NO3-) ternary layered double hydroxide as a sorbent, is developed for the pre-concentration of ultra-trace levels of arsenic (As) prior to determination by electrothermal atomic absorption spectrometry. It is found that both As(III) and As(V) could be quantitatively retained on the sorbent within a wide pH range of 4-12. Accordingly, the presented method is applied to determination of total inorganic As in aqueous solutions. Maximum analytical signal of As is achieved when the pyrolysis and atomization temperatures are close to 900 degrees C and 2300 degrees C, respectively. Several variables affecting the extraction efficiency including pH, sample flow rate, amount of nano-sorbent, elution conditions and sample volume are optimized. Under the optimized conditions, the limit of detection (3S(b)/m) and the relative standard deviation are 4.6 pg mL(-1) and 3.9%, respectively. The calibration graph is linear in the range of 15.0-650 pg mL(-1) with a correlation coefficient of 0.9979, sorption capacity and pre-concentration factor are 8.68 mg g(-1) and 300, respectively. The developed method is validated by the analysis of a standard reference material (SRM 1643e) and is successfully applied to the determination of ultra-trace amounts of As in different water samples. (C) 2013 Elsevier B.V. All rights reserved.
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