title: Colorimetric detection of trace Hg²+ with near-infrared absorbing squaraine functionalized by dibenzo-18-crown-6 and its mechanism.
abstract: In this contribution, an improved near-infrared absorbing colorimetric detection of Hg(2+) 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 Hg(2+) in synthetic Hg(2+) samples and natural Hg(2+) samples. Under the optimum conditions, the detection had a linear range of 7.5-150 × 10(-8) mol L(-1) with a correlation coefficient (R) of 0.9983 combining a limit detection (3σ, n=20) of 5.6 × 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 Hg(2+) was discussed in details.
authors.affiliation: Anhui Provincial Laboratory of Biomimetic Sensor and Detecting Technology & Department of Material and Chemical Industry, West Anhui University, Lu'an 237012, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Hu
authors.forename: Yafei
authors.initials: Y
authors.lastname: Zhang
authors.forename: Li
authors.initials: L
authors.lastname: Nie
authors.forename: Chenggen
authors.initials: C
authors.lastname: Xie
authors.forename: Zhengquan
authors.initials: Z
authors.lastname: Yan
mesh_terms: D000042:Absorption; D003124:Colorimetry / Q000379:methods*; D043844:Crown Ethers / Q000737:chemistry*; D003503:Cyclobutanes / Q000737:chemistry*; D004121:Dimethyl Sulfoxide / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D008628:Mercury / Q000032:analysis*; D010636:Phenols / Q000737:chemistry*; D012965:Sodium Chloride / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet; D019265:Spectroscopy, Near-Infrared / Q000379:methods*; D013501:Surface-Active Agents / Q000737:chemistry; D013997:Time Factors; D014874:Water Pollutants, Chemical / Q000032:analysis
chemical_list: D043844:Crown Ethers; D003503:Cyclobutanes; D010636:Phenols; D013501:Surface-Active Agents; D014874:Water Pollutants, Chemical; C480596:squaraine; C002564:dibenzo-18-crown-6; D012965:Sodium Chloride; D008628:Mercury; D004121:Dimethyl Sulfoxide