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- W2158476688 abstract "A colorimetric filtration method has been developed for the highly selective and sensitive determination of Ni2+ and Pb2+ ions. Determinations of Ni2+ and Pb2+ follow the filtration using nioxime (1,2-cyclohexanedione dioxime) and rhodizonic acid disodium salt, respectively, as colorimetric reagents. Different from regular instrumentation techniques, the metal chelate precipitations are continuously pumped into a home-made flow cell at a constant flow rate, and filtered by a cellulose acetate/nitrate membrane. The color changes of the membrane are imaged using a conventional flatbed scanner, and digitized. The special selection of individual channels in the red, green, and blue channels of the images filters the influences of coexisting ions and provides a highly selective detection of Ni2+ and Pb2+ cations. The linear relationship between the colorimetric response of the chosen channel and Ni2+ or Pb2+ concentrations indicates a quantitative detection. The detection limit for Pb2+ is 3 μM (almost half of the Chinese wastewater discharge standard concentration), and is well below the nM level (94 nM) for Ni2+ (a quarter of the WHO drinking water safe-exposure standard for Ni2+). The determinations take five to ten minutes. No shelf life issue exists because the chelating indicators react with metal directly without any pre-immobilizations." @default.
- W2158476688 created "2016-06-24" @default.
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- W2158476688 date "2011-01-01" @default.
- W2158476688 modified "2023-10-11" @default.
- W2158476688 title "Colorimetric filtrations of metal chelate precipitations for the quantitative determination of nickel(ii) and lead(ii)" @default.
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- W2158476688 doi "https://doi.org/10.1039/c1an15290d" @default.
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