期刊
ANALYTICA CHIMICA ACTA
卷 788, 期 -, 页码 52-60出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2013.05.049
关键词
In-syringe magnetic stirring-assisted; liquid-liquid microextraction; Single-drop extraction; Aluminum; Seawater; Lumogallion
资金
- Spanish Ministry of Science and Innovation [CTQ2010-15541]
- Conselleria d'Economia, Hisenda, e Innovacio of the Government of the Balearic Islands through the allowance to competitive groups [43/2011]
- Education for Competitiveness Operational Program (ECOP) [CZ.1.07/2.3.00/30.0022]
- European Social Fund
- state budget of the Czech Republic
For the first time, the use of a magnetic stirrer within the syringe of an automated syringe pump and the resulting possible analytical applications are described. A simple instrumentation following roughly the one from sequential injection analyzer systems is used in combination with an adaptor, which is placed onto the barrel of a glass syringe. Swirling around the longitudinal axis of the syringe and holding two strong neodymium magnets, it causes a rotating magnetic field and serves as driver for a magnetic stirring bar placed inside of the syringe. In a first study it was shown that this approach leads to a sealed but also automatically adaptable reaction vessel, the syringe, in which rapid and homogeneous mixing of sample with the required reagents within short time can be carried out. In a second study in-a-syringe magnetic stirring-assisted dispersive liquid-liquid microextraction (MSA-DLLME) was demonstrated by the application of the analyzer system to fluorimetric determination of aluminum in seawater samples using lumogallion. A linear working range up to 1.1 mu mol L-1 and a limit of detection of 6.1 nmol L-1 were found. An average recovery of 106.0% was achieved for coastal seawaters with a reproducibility of 4.4%. The procedure lasted 210s including syringe cleaning and only 150 mu L of hexanol and 4.1 mL of sample were required. (C) 2013 Elsevier B.V. All rights reserved.
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