A Sensitive Photometric Procedure for Cobalt Determination in Water Employing a Compact Multicommuted Flow Analysis System.
作者： Ticiane da Silva Magalhães , Boaventura F. Reis
关键词: Detection limit 、 Standard solution 、 Fresh water 、 Flow (psychology) 、 Photometer 、 Chromatography 、 Hydrogen peroxide 、 Materials science 、 Tiron 、 Cobalt 、 Analytical chemistry
摘要: In this work, a multicommuted flow analysis procedure is proposed for the spectrophotometric determination of cobalt in fresh water, employing an instrument setup downsized dimension and improved cost-effectiveness. The method based on catalytic effect Co(II) Tiron oxidation by hydrogen peroxide alkaline medium, forming complex that absorbs radiation at 425 nm. photometric detection was accomplished using homemade light-emitting-diode (LED)-based photometer designed to use cell with optical path-length 100 mm improve sensitivity. After selecting adequate values system variables, adherence Beer–Lambert–Bouguer law observed standard solution concentrations range 0.13–1.5 µg L−1 Co(II). Other useful features including relative deviation 2.0% (n = 11) sample 0.49 µg L−1 Co(II), limit 0.06 µg L−1 (n = 20), analytical frequency 42 determinations per hour, waste gen...
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