Please use this identifier to cite or link to this item: http://nopr.niscair.res.in/handle/123456789/20099
Title: Solvent extraction, separation and recovery of lanthanum(III) and cerium(IV) from monazite sand by N-phenylbenzo-18-crown-6 hydroxamic acid
Authors: Agrawal, Y K
Vora, S B
Shah, G
Issue Date: Mar-2005
Publisher: NISCAIR-CSIR, India
IPC Code: Int. Cl.7 G01N; C07C 59/00; C22B 59/00
Abstract: A new N-phenylbenzo-18-crown-6-hydroxamic acid is reported for the separation of lanthanum(III) and cerium(IV) from monazite. Lanthanum(III) and cerium(IV) have been ex tracted and separated in presence of thorium, uranium and other associated cations at pH 8.8 and 9.5, respectively, in dichloromethane. Lanthanum(III) gives a colourless complex with the reagent which is extracted into dichloromethane and has molar absorptivity of 9.0 × 103 L mol-1 cm-1 at 385 nm. Cerium(IV) forms a red colour complex with the reagent extracted in dichloromethane with λmax 450 nm and molar absorptivity 6.5 × 103 L mol-1 cm-1. For trace determination, the extracts are inserted directly into the plasma for ICP-AES measurements of La(III) and Ce(IV) in the range of 4-80 ng mL-1 and 8-120 ng mL-1, respecti vely with the detection limit of 0.5 ng mL-1. The complexes of lanthanum(III) and cerium(IV) are very stable, (log β2k 20.20 and 20.50, respectively) as compared to those of thorium ( 1.60), uranium (1.80), and other related cations. The proposed method of preconcentration and analysis of La(III) and Ce(IV) is not adversely affected by highly ionic media, rendering the method suitable for their trace determination in sea water.
Page(s): 497-503
URI: http://hdl.handle.net/123456789/20099
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections: IJC-A Vol.44A(03) [March 2005]

Files in This Item:
File Description SizeFormat 
IJCA 44A(3) 497-503.pdf1.44 MBAdobe PDFView/Open


Items in NOPR are protected by copyright, with all rights reserved, unless otherwise indicated.