Journal
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Volume 104, Issue -, Pages 87-91Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2012.11.026
Keywords
Bis-dibenzo-18-crown-6-based squaraine; Near infrared absorption; Calorimetric method; Hg2+ detection
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Funding
- National Natural Science Fund of China [21277103]
- College Outstanding Young Talent Fund of Anhui Province [2011SQRL148]
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In this contribution, an improved near-infrared absorbing colorimetric detection of Hg2+ ion with high selectivity and sensitivity had been developed by using bis-dibenzo-18-crown-6-based squaraine (BCSQ) as sensor in aqueous media. The proposed method was applied to analyze trace Hg2+ in synthetic Hg2+ samples and natural Hg2+ samples. Under the optimum conditions, the detection had a linear range of 7.5-150 x 10(-8) mol L-1 with a correlation coefficient (R) of 0.9983 combining a limit detection (3 sigma, n = 20) of 5.6 x 10(-9) mol L-1. The relative standard deviation (RSD) was lower than 2.4% (n = 5). The proposed method possesses the advantages of simplicity, rapidity, high selectivity and sensitivity. The action mechanism between BCSQ and Hg2+ was discussed in details. (C) 2012 Elsevier B.V. All rights reserved.
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