期刊
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
卷 110, 期 -, 页码 118-123出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.sab.2015.06.005
关键词
Arsenic; Multi-walled carbon nanotubes; Dispersive micro-solid phase extraction; Garlic
类别
资金
- Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET)
- Agencia Nacional de Promocion Cientifica y Tecnologica (FONCYT) [PICT-2013-0072, PICT-2013-0957]
- Universidad Nacional de Cuyo [06/M079, 06/M012]
- Organization for the Prohibition of Chemical Weapons (OPCW)
A highly sensitive dispersive micro-solid phase extraction (D-mu-SPE) method combining an ionic liquid (IL) and multi-walled carbon nanotubes (MWCNTs) for inorganic As species (As(III) and As(V)) species separation and determination in garlic samples by electrothermal atomic absorption spectrometry (ETAAS) was developed. Trihexyl(tetradecil)phosphonium chloride IL was used to form an ion pair with the arsenomolybdate complex obtained by reaction of As(V) with molybdate ion. Afterwards, 1.0 mg of MWCNTs was dispersed for As(V) extraction and the supernatant was separated by centrifugation. MWCNTs were re-dispersed with tetradecyltrimethylammonium bromide surfactant and ultrasound followed by direct injection into the graphite furnace of ETAAS for As determination. Pyrolysis and atomization conditions were carefully studied for complete decomposition of MWCNTs and IL matrices. Under optimum conditions, an extraction efficiency of 100% and a preconcentration factor of 70 were obtained with 5 mL of garlic extract. The detection limit was 7.1 ng L-1 and the relative standard deviations (RSDs) for six replicate measurements at 5 mu g L-1 of As were 5.4% and 4.8% for As(III) and As (V), respectively. The proposed D-mu-SPE method allowed the efficient separation and determination of inorganic As species in a complex matrix such as garlic extract (C) 2015 Elsevier B.V. All rights reserved.
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