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Title: Liquid-liquid extraction, separation and preconcentration, membrane transportation and ICP-AES determination of vanadium with dibenzo-18-crown-6
Authors: Agrawal, Y K
Menon, S K
Jain, V K
Issue Date: May-2003
Publisher: NISCAIR-CSIR, India
Abstract: Dibenzo-18-crown-6(DB18C6) is used for the liquid-liquid extraction and membrane transporation of vanadium(V).Vanadium is extracted with DB 18C6 in 3.0 M HCl medium using dichloromethane as solvent which forms a colourless complex (λmax 285 nm). The complex obeys Beer's law in the range of 4.25-93.5 ng mL-1. The dichloromethane extract is directly inserted into plasma for inductively coupled plasma atomic emission spectrophotometric (ICP-AES) estimation of vanadium, which enhances the sensitivity several folds and the limits for estimation is 0.2-5.0 ng mL-1 with detection limit 0.05 ng mL-1. The overall formation constant (logβ2Kʹc) and extraction constant (Kcx) calculated are 22.20 and 1.8×10-14 at 25°C, respectively. Vanadium is preconcentrated and determined in sea water, standard samples and environmental samples.
Page(s): 1008-1012
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.42A(05) [May 2003]

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