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, C sar Soto, Jorge Ya ez,M. In s Toral |
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| Affiliation: | 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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