期刊
TALANTA
卷 105, 期 -, 页码 87-92出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2012.11.061
关键词
Mercuric ion; Preconcentration; Visual; Fluorescence
资金
- National Nature Science Foundation of China [21027001, 21005080, 21021004]
- China 863 project [2011AA060602]
In this work, trace Hg2+ in environmental water samples was first preconcentrated by dispersive liquid-liquid microextraction (DLLME), and then was colorated by one common rhodamine B thiolactone (RBT) probe for visual and fluorescence detection. In this way, a highly sensitive and selective method was developed for field monitoring of Hg2+ in environmental waters. The color of RBT test solution could change clearly from colorless to pink around the level of 2 mu g L-1 Hg2+, which just meets with the maximum residue level of Hg2+ in drinking water recommended by U.S. EPA, so the water samples with Hg2+ concentration over 2 mu g L-1 could be selected rapidly by naked eye. Moreover, the quantification of Hg2+ could be obtained by fluorescence detection of test solution. The best extraction efficiency of Hg2+ by DLLLME could be obtained by using 200 mL water sample (pH 5.0, 50 degrees C), 150 mu L extraction solvent (lauric acid, LA) and 3 mL dispersive solvent (methanol). Thus an enrichment factor of similar to 407 and the limit of fluorescence detection of 0.03 mu g L-1 could be achieved. The method was also highly selective for Hg2+ with tolerance to at least 1000-fold of the foreign metal ions. This method was successfully applied to detect Hg2+ in deionized water, tap water and sea water. (C) 2012 Elsevier B.V. All rights reserved.
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