LIQUID-LIQUID EXTRACTION, PRECONCENTRATION AND TRANSPORT STUDIES OF LANTHANUM (III) WITH CALIX [4] RESORCINARENE-HYDROXAMIC ACID (C4RAHA)

A liquid-liquid extraction and preconcentration of lanthanum (III) with a calix[4]resorcinarene bearing eight hydroxamic acid groups (C4RAHA) is described. Its analytical properties were investigated, and showed high affinity and selectivity towards lanthanum (III) in the presence of large quantitie...

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Autores principales: JAIN,VINOD. K., PILLAP,SHIBU. G., MANDAL,HIREN C.
Lenguaje:English
Publicado: Sociedad Chilena de Química 2007
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Acceso en línea:http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072007000200013
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spelling oai:scielo:S0717-970720070002000132007-09-13LIQUID-LIQUID EXTRACTION, PRECONCENTRATION AND TRANSPORT STUDIES OF LANTHANUM (III) WITH CALIX [4] RESORCINARENE-HYDROXAMIC ACID (C4RAHA)JAIN,VINOD. K.PILLAP,SHIBU. G.MANDAL,HIREN C. calix[4]resorcinarene hydroxamic acid lanthanum transport study monazite sand A liquid-liquid extraction and preconcentration of lanthanum (III) with a calix[4]resorcinarene bearing eight hydroxamic acid groups (C4RAHA) is described. Its analytical properties were investigated, and showed high affinity and selectivity towards lanthanum (III) in the presence of large quantities of associated metal ions. Quantitative extraction of lanthanum (III) with C4RAHA was achieved in ethyl acetate in the pH range 7.5-8.0. The extract is directly aspirated into ICP-AES, which increases the sensitivity and detection limit many folds. The λmax and molar absorptivity (ε) for lanthanum were 364nm and 8374 L mol-1cm-¹. The binding ratio of lanthanum with C4RAHA as evaluated by Job’s method is 4:1. The system obeys Beer’s law over the range 0.2 - 9.0 µg mL-¹ of lanthanum with Sandell’s sensitivity of 0.016 µg cm-². The preconcentration factor and overall two-phase stability constant evaluated at 25°C were 115 and 16.77 respectively. The complexation is characterized by favorable enthalpy and entropy changes. A liquid membrane transport study of lanthanum was carried out in a three-phase system under controlled conditions and a mechanism of transport is proposed. To ascertain the validity of the proposed method lanthanum has been determined in monazite sand and some standard geological standardsinfo:eu-repo/semantics/openAccessSociedad Chilena de QuímicaJournal of the Chilean Chemical Society v.52 n.2 20072007-06-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072007000200013en10.4067/S0717-97072007000200013
institution Scielo Chile
collection Scielo Chile
language English
topic calix[4]resorcinarene
hydroxamic acid
lanthanum
transport study
monazite sand
spellingShingle calix[4]resorcinarene
hydroxamic acid
lanthanum
transport study
monazite sand
JAIN,VINOD. K.
PILLAP,SHIBU. G.
MANDAL,HIREN C.
LIQUID-LIQUID EXTRACTION, PRECONCENTRATION AND TRANSPORT STUDIES OF LANTHANUM (III) WITH CALIX [4] RESORCINARENE-HYDROXAMIC ACID (C4RAHA)
description A liquid-liquid extraction and preconcentration of lanthanum (III) with a calix[4]resorcinarene bearing eight hydroxamic acid groups (C4RAHA) is described. Its analytical properties were investigated, and showed high affinity and selectivity towards lanthanum (III) in the presence of large quantities of associated metal ions. Quantitative extraction of lanthanum (III) with C4RAHA was achieved in ethyl acetate in the pH range 7.5-8.0. The extract is directly aspirated into ICP-AES, which increases the sensitivity and detection limit many folds. The λmax and molar absorptivity (ε) for lanthanum were 364nm and 8374 L mol-1cm-¹. The binding ratio of lanthanum with C4RAHA as evaluated by Job’s method is 4:1. The system obeys Beer’s law over the range 0.2 - 9.0 µg mL-¹ of lanthanum with Sandell’s sensitivity of 0.016 µg cm-². The preconcentration factor and overall two-phase stability constant evaluated at 25°C were 115 and 16.77 respectively. The complexation is characterized by favorable enthalpy and entropy changes. A liquid membrane transport study of lanthanum was carried out in a three-phase system under controlled conditions and a mechanism of transport is proposed. To ascertain the validity of the proposed method lanthanum has been determined in monazite sand and some standard geological standards
author JAIN,VINOD. K.
PILLAP,SHIBU. G.
MANDAL,HIREN C.
author_facet JAIN,VINOD. K.
PILLAP,SHIBU. G.
MANDAL,HIREN C.
author_sort JAIN,VINOD. K.
title LIQUID-LIQUID EXTRACTION, PRECONCENTRATION AND TRANSPORT STUDIES OF LANTHANUM (III) WITH CALIX [4] RESORCINARENE-HYDROXAMIC ACID (C4RAHA)
title_short LIQUID-LIQUID EXTRACTION, PRECONCENTRATION AND TRANSPORT STUDIES OF LANTHANUM (III) WITH CALIX [4] RESORCINARENE-HYDROXAMIC ACID (C4RAHA)
title_full LIQUID-LIQUID EXTRACTION, PRECONCENTRATION AND TRANSPORT STUDIES OF LANTHANUM (III) WITH CALIX [4] RESORCINARENE-HYDROXAMIC ACID (C4RAHA)
title_fullStr LIQUID-LIQUID EXTRACTION, PRECONCENTRATION AND TRANSPORT STUDIES OF LANTHANUM (III) WITH CALIX [4] RESORCINARENE-HYDROXAMIC ACID (C4RAHA)
title_full_unstemmed LIQUID-LIQUID EXTRACTION, PRECONCENTRATION AND TRANSPORT STUDIES OF LANTHANUM (III) WITH CALIX [4] RESORCINARENE-HYDROXAMIC ACID (C4RAHA)
title_sort liquid-liquid extraction, preconcentration and transport studies of lanthanum (iii) with calix [4] resorcinarene-hydroxamic acid (c4raha)
publisher Sociedad Chilena de Química
publishDate 2007
url http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072007000200013
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