title: Sensitive determination of trace mercury by UV-visible diffuse reflectance spectroscopy after complexation and membrane filtration-enrichment.
abstract: A simple, sensitive and selective solid phase reflectometry method is proposed for the determination of trace mercury in aqueous samples. The complexation reagent dithizone was firstly injected into the properly buffered solution with vigorous stirring, which started a simultaneous formation of nanoparticles suspension of dithizone and its complexation reaction with the mercury(II) ions to make Hg-dithizone nanoparticles. After a definite time, the mixture was filtered with membrane, and then quantified directly on the surface of the membrane by using integrating sphere accessory of the UV-visible spectrophotometer. The quantitative analysis was carried out at a wavelength of 485 nm since it yielded the largest difference in diffuse reflectance spectra before and after reaction with mercury(II).A good linear correlation in the range of 0.2-4.0 μg/L with a squared correlation coefficient (R(2)) of 0.9944 and a detection limit of 0.12 μg/L were obtained. The accuracy of the method was evaluated by the analysis of spiked mercury(II) concentrations determined using this method along with those determined by the atomic fluorescence mercury vapourmeter and the results obtained were in good agreement. The proposed method was applied to the determination of mercury in tap water and river water samples with the recovery in an acceptable range (95.7-105.3%).
authors: Shanghai Key Laboratory of Functional Materials Chemistry, and Research Center of Analysis and Test, East China University of Science and Technology, Shanghai, China.
authors: Changhai
authors: C
authors: Yin
authors: Jibran
authors: J
authors: Iqbal
authors: Huilian
authors: H
authors: Hu
authors: Bingxiang
authors: B
authors: Liu
authors: Lei
authors: L
authors: Zhang
authors: Bilin
authors: B
authors: Zhu
authors: Yiping
authors: Y
authors: Du
mesh_terms: D002614:Chelating Agents / Q000737:chemistry; D004230:Dithizone / Q000737:chemistry; D004492:Edetic Acid / Q000737:chemistry; D005374:Filtration; D007202:Indicators and Reagents / Q000737:chemistry; D008567:Membranes, Artificial; D008628:Mercury / Q000032:analysis* / Q000737:chemistry; D013057:Spectrum Analysis / Q000379:methods; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry
chemical_list: D002614:Chelating Agents; D007202:Indicators and Reagents; D008567:Membranes, Artificial; D014874:Water Pollutants, Chemical; D004230:Dithizone; D004492:Edetic Acid; D008628:Mercury