Determination of cobalt in water samples by photoacoustic spectroscopy with a solid-phase spectrophotometry approach using 3-(2-pyridyl)-5,6-bis(4-sulfophenyl)-1,2,4-triazine |
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| Authors: | Renato Saavedra Csar Soto Jorge Yaez M Ins Toral |
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| Institution: | a Recycling Research Team, Tottori Pref. Inst. of Public Health and Environmental Science, 526-1 Minamidani, Yurihama-cho, Tottori, 6820704 Japan;b Research Center for Material Cycle and Waste Management, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506 Japan;c Kyoto Research Laboratories Sekisui Chemical Co., Ltd., 2-2 Kamichoshi-cho, Kamitoba, Minami-ku, Kyoto, 601-8105, Japan;d Department of Regional Environment, Faculty of Regional Sciences, Tottori University, Koyama-cho, Tottori 680-8551, Japan |
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| Abstract: | This work forms part of an investigation which seeks to determine metal complexes in a solid phase by photoacoustic spectrometry (PAS). Results of spectral determination of Co(II) complexes are introduced. The method is based on Co(II) colorimetric reaction with 3-(2-pyridyl)-5,6-bis(4-sulfophenyl)-1,2,4-triazine (FST, ferrozine) retained on an anion-exchange resin, DEAE Sephadex A-25. The immobilization of Co(II) on the solid phase is combined with PAS measurement. A numerical approach is applied to reduce noise in the spectral data. At λ = 477 nm, the calibration for Co(II) is linear over the range 14–300 μgL? 1. The Co(II) concentration in water samples was determined by conventional photoacoustic measurement. The relative standard deviation (R.S.D.) of the method for the calibration is < 5%. Under optimized conditions, the obtained analytical features were LOD 14 μgL? 1 and LOQ 45 μgL? 1. |
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| Keywords: | Lead Disposable cartridge Mercury-free anodic stripping voltammetry Municipal solid waste molten slag Leaching test |
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