Emulsion liquid membrane separation of As(III) and As(V) |
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Authors: | Longquan Li Ping Yan Wenzhong Gao and Yadong Li |
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Institution: | (1) Department of Chemistry, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China, CN |
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Abstract: | Emulsion liquid membranes (ELM) consisting of L113A (surfactant), liquid paraffin (stabilizer) and kerosene (solvent), with
HCl solution acting as the external phase and KOH solution acting as the internal phase, were applied to the prior separation
of arsenic(III) and arsenic(V) with subsequent spectrophotometric determination by AgDDTC. The effect of various parameters
on the recovery of arsenic(III) were investigated. 8 mol/L HCl was required for 95% As(III) recovery. After reduction of As(V)
to As(III) with sufficient KI, total arsenic could be determined. The RSD of As(III) and As(total) were both less than 3%.
The procedure was applied to aqueous samples with a recovery of 93.5%–101%.
Received: 22 March 1998 / Revised: 12 September 1998 / Accepted: 17 September 1998 |
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