Separation of cobalt and nickel by emulsion liquid membrane with the use of EDTA as masking reagent |
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| Institution: | 1. Institute of Environmental Radioactivity, Fukushima University, 1 Kanayagawa, Fukushima City, Fukushima 960-1296, Japan;2. Department of Civil Engineering, Southern University, 739/A Mehedibag Road, Chittagong 4000, Bangladesh;3. Denka Co., Ltd., Nihonbashi-Muromachi 2-chome, Chuo-ku, Tokyo 103-8338, Japan;4. Institute of Science and Engineering, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan |
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| Abstract: | EDTA was used to complex nickel to allow a separation of trace amounts of nickel and cobalt in an emulsion liquid membrane (ELM), which contains P204, L-113A, liquid paraffin, kerosene and HCl. Separation time is about 20 min. Separated cobalt and nickel can be easily determined by spectrophotometer. The favorable range of pH is 4.4–5.2. The total separation coefficient is over 220 and the recoveries of cobalt and nickel are more than 95% and less than 8%, respectively. Among the coexisting ions investigated, only copper ion affects the separation. |
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