INVESTIGADORES
SILVA Maria Fernanda
artículos
Título:
Cloud Point Extraction of Lead in Saliva via Use of Nonionic PONPE 7.5 Without Added Chelating Agents
Autor/es:
MARTA O. LUCONI; M. FERNANDA SILVA; ROBERTO A. OLSINA; LILIANA P. FERNÁNDEZ
Revista:
TALANTA
Editorial:
Elsevier
Referencias:
Año: 2000 vol. 51 p. 123 - 129
ISSN:
0039-9140
Resumen:
A new micelle-mediated phase separation of metal ions to preconcentrate trace levels of lead as a prior step to its
determination by flame atomic spectroscopy has been developed. The methodology is based on the cloud point
extraction of lead with PONPE 7.5 in the absence of chelating agent. The chemical variables affecting the sensitivity
of the extractive-spectrometric procedure were evaluated in detail, optimised and successfully applied to the
determination of lead in saliva samples. Under the optimal conditions, a %E higher than 99.9 was achieved. The
proposed method showed linear calibration within the range: 0.6?4 mg ml1 Pb(II). The sensitivity was 0.053 mg
ml1. The method has been applied to the determination of lead in human saliva. The nature of the extracting species
as well as the location of lead in the micelle were studied. The analytical performance of the proposed method clearly
satisfies the typical requirements for control processes
as well as the location of lead in the micelle were studied. The analytical performance of the proposed method clearly
satisfies the typical requirements for control processes
as well as the location of lead in the micelle were studied. The analytical performance of the proposed method clearly
satisfies the typical requirements for control processes
ml1. The method has been applied to the determination of lead in human saliva. The nature of the extracting species
as well as the location of lead in the micelle were studied. The analytical performance of the proposed method clearly
satisfies the typical requirements for control processes
as well as the location of lead in the micelle were studied. The analytical performance of the proposed method clearly
satisfies the typical requirements for control processes
as well as the location of lead in the micelle were studied. The analytical performance of the proposed method clearly
satisfies the typical requirements for control processes
ml1. The method has been applied to the determination of lead in human saliva. The nature of the extracting species
as well as the location of lead in the micelle were studied. The analytical performance of the proposed method clearly
satisfies the typical requirements for control processes
as well as the location of lead in the micelle were studied. The analytical performance of the proposed method clearly
satisfies the typical requirements for control processes
as well as the location of lead in the micelle were studied. The analytical performance of the proposed method clearly
satisfies the typical requirements for control processes
proposed method showed linear calibration within the range: 0.6?4 mg ml1 Pb(II). The sensitivity was 0.053 mg
ml1. The method has been applied to the determination of lead in human saliva. The nature of the extracting species
as well as the location of lead in the micelle were studied. The analytical performance of the proposed method clearly
satisfies the typical requirements for control processes
as well as the location of lead in the micelle were studied. The analytical performance of the proposed method clearly
satisfies the typical requirements for control processes
as well as the location of lead in the micelle were studied. The analytical performance of the proposed method clearly
satisfies the typical requirements for control processes
ml1. The method has been applied to the determination of lead in human saliva. The nature of the extracting species
as well as the location of lead in the micelle were studied. The analytical performance of the proposed method clearly
satisfies the typical requirements for control processes
as well as the location of lead in the micelle were studied. The analytical performance of the proposed method clearly
satisfies the typical requirements for control processes
as well as the location of lead in the micelle were studied. The analytical performance of the proposed method clearly
satisfies the typical requirements for control processes
ml1. The method has been applied to the determination of lead in human saliva. The nature of the extracting species
as well as the location of lead in the micelle were studied. The analytical performance of the proposed method clearly
satisfies the typical requirements for control processes
as well as the location of lead in the micelle were studied. The analytical performance of the proposed method clearly
satisfies the typical requirements for control processes
as well as the location of lead in the micelle were studied. The analytical performance of the proposed method clearly
satisfies the typical requirements for control processes
proposed method showed linear calibration within the range: 0.6?4 mg ml1 Pb(II). The sensitivity was 0.053 mg
ml1. The method has been applied to the determination of lead in human saliva. The nature of the extracting species
as well as the location of lead in the micelle were studied. The analytical performance of the proposed method clearly
satisfies the typical requirements for control processes
as well as the location of lead in the micelle were studied. The analytical performance of the proposed method clearly
satisfies the typical requirements for control processes
as well as the location of lead in the micelle were studied. The analytical performance of the proposed method clearly
satisfies the typical requirements for control processes
ml1. The method has been applied to the determination of lead in human saliva. The nature of the extracting species
as well as the location of lead in the micelle were studied. The analytical performance of the proposed method clearly
satisfies the typical requirements for control processes
as well as the location of lead in the micelle were studied. The analytical performance of the proposed method clearly
satisfies the typical requirements for control processes
as well as the location of lead in the micelle were studied. The analytical performance of the proposed method clearly
satisfies the typical requirements for control processes
ml1. The method has been applied to the determination of lead in human saliva. The nature of the extracting species
as well as the location of lead in the micelle were studied. The analytical performance of the proposed method clearly
satisfies the typical requirements for control processes
as well as the location of lead in the micelle were studied. The analytical performance of the proposed method clearly
satisfies the typical requirements for control processes
as well as the location of lead in the micelle were studied. The analytical performance of the proposed method clearly
satisfies the typical requirements for control processes
E higher than 99.9 was achieved. The
proposed method showed linear calibration within the range: 0.6?4 mg ml1 Pb(II). The sensitivity was 0.053 mg
ml1. The method has been applied to the determination of lead in human saliva. The nature of the extracting species
as well as the location of lead in the micelle were studied. The analytical performance of the proposed method clearly
satisfies the typical requirements for control processes
as well as the location of lead in the micelle were studied. The analytical performance of the proposed method clearly
satisfies the typical requirements for control processes
as well as the location of lead in the micelle were studied. The analytical performance of the proposed method clearly
satisfies the typical requirements for control processes
ml1. The method has been applied to the determination of lead in human saliva. The nature of the extracting species
as well as the location of lead in the micelle were studied. The analytical performance of the proposed method clearly
satisfies the typical requirements for control processes
as well as the location of lead in the micelle were studied. The analytical performance of the proposed method clearly
satisfies the typical requirements for control processes
as well as the location of lead in the micelle were studied. The analytical performance of the proposed method clearly
satisfies the typical requirements for control processes
ml1. The method has been applied to the determination of lead in human saliva. The nature of the extracting species
as well as the location of lead in the micelle were studied. The analytical performance of the proposed method clearly
satisfies the typical requirements for control processes
as well as the location of lead in the micelle were studied. The analytical performance of the proposed method clearly
satisfies the typical requirements for control processes
as well as the location of lead in the micelle were studied. The analytical performance of the proposed method clearly
satisfies the typical requirements for control processes
mg ml1 Pb(II). The sensitivity was 0.053 mg
ml1. The method has been applied to the determination of lead in human saliva. The nature of the extracting species
as well as the location of lead in the micelle were studied. The analytical performance of the proposed method clearly
satisfies the typical requirements for control processes
as well as the location of lead in the micelle were studied. The analytical performance of the proposed method clearly
satisfies the typical requirements for control processes
as well as the location of lead in the micelle were studied. The analytical performance of the proposed method clearly
satisfies the typical requirements for control processes
1. The method has been applied to the determination of lead in human saliva. The nature of the extracting species
as well as the location of lead in the micelle were studied. The analytical performance of the proposed method clearly
satisfies the typical requirements for control processes