INVESTIGADORES
SILVA Maria Fernanda
artículos
Título:
On-line complexation/cloud point preconcentration for the sensitive determination of dysprosium in urine by flow injection inductively coupled plasma-optical emission spectrometry
Autor/es:
CLAUDIA ORTEGA; SOLEDAD CERUTTI; ROBERTO A. OLSINA; M. FERNANDA SILVA; L. DANTE MARTÍNEZ
Revista:
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
Editorial:
Springer
Referencias:
Año: 2003 vol. 375 p. 270 - 274
ISSN:
1618-2642
Resumen:
Abstract An on-line dysprosium preconcentration and
determination system based on the hyphenation of cloud
point extraction (CPE) to flow injection analysis (FIA) associated
with ICP?OES was studied. For the preconcentration
of dysprosium, a Dy(III)?2-(5-bromo-2-pyridylazo)-
5-diethylaminophenol complex was formed on-line at pH
9.22 in the presence of nonionic micelles of PONPE-7.5.
The micellar system containing the complex was thermostated
at 30 °C in order to promote phase separation,
and the surfactant-rich phase was retained in a microcolumn
packed with cotton at pH 9.2. The surfactant-rich
phase was eluted with 4 mol L?1 nitric acid at a flow rate
of 1.5mLmin?1, directly in the nebulizer of the plasma.
An enhancement factor of 50 was obtained for the preconcentration
of 50 mL of sample solution. The detection
limit value for the preconcentration of 50 mL of aqueous
solution of Dy was 0.03 ìgL?1. The precision for 10 replicate
determinations at the 2.0 ìgL?1 Dy level was 2.2%
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
determinations at the 2.0 ìgL?1 Dy level was 2.2%
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
An enhancement factor of 50 was obtained for the preconcentration
of 50 mL of sample solution. The detection
limit value for the preconcentration of 50 mL of aqueous
solution of Dy was 0.03 ìgL?1. The precision for 10 replicate
determinations at the 2.0 ìgL?1 Dy level was 2.2%
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
determinations at the 2.0 ìgL?1 Dy level was 2.2%
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
of 1.5mLmin?1, directly in the nebulizer of the plasma.
An enhancement factor of 50 was obtained for the preconcentration
of 50 mL of sample solution. The detection
limit value for the preconcentration of 50 mL of aqueous
solution of Dy was 0.03 ìgL?1. The precision for 10 replicate
determinations at the 2.0 ìgL?1 Dy level was 2.2%
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
determinations at the 2.0 ìgL?1 Dy level was 2.2%
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
An enhancement factor of 50 was obtained for the preconcentration
of 50 mL of sample solution. The detection
limit value for the preconcentration of 50 mL of aqueous
solution of Dy was 0.03 ìgL?1. The precision for 10 replicate
determinations at the 2.0 ìgL?1 Dy level was 2.2%
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
determinations at the 2.0 ìgL?1 Dy level was 2.2%
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
determination system based on the hyphenation of cloud
point extraction (CPE) to flow injection analysis (FIA) associated
with ICP?OES was studied. For the preconcentration
of dysprosium, a Dy(III)?2-(5-bromo-2-pyridylazo)-
5-diethylaminophenol complex was formed on-line at pH
9.22 in the presence of nonionic micelles of PONPE-7.5.
The micellar system containing the complex was thermostated
at 30 °C in order to promote phase separation,
and the surfactant-rich phase was retained in a microcolumn
packed with cotton at pH 9.2. The surfactant-rich
phase was eluted with 4 mol L?1 nitric acid at a flow rate
of 1.5mLmin?1, directly in the nebulizer of the plasma.
An enhancement factor of 50 was obtained for the preconcentration
of 50 mL of sample solution. The detection
limit value for the preconcentration of 50 mL of aqueous
solution of Dy was 0.03 ìgL?1. The precision for 10 replicate
determinations at the 2.0 ìgL?1 Dy level was 2.2%
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
determinations at the 2.0 ìgL?1 Dy level was 2.2%
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
An enhancement factor of 50 was obtained for the preconcentration
of 50 mL of sample solution. The detection
limit value for the preconcentration of 50 mL of aqueous
solution of Dy was 0.03 ìgL?1. The precision for 10 replicate
determinations at the 2.0 ìgL?1 Dy level was 2.2%
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
determinations at the 2.0 ìgL?1 Dy level was 2.2%
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
of 1.5mLmin?1, directly in the nebulizer of the plasma.
An enhancement factor of 50 was obtained for the preconcentration
of 50 mL of sample solution. The detection
limit value for the preconcentration of 50 mL of aqueous
solution of Dy was 0.03 ìgL?1. The precision for 10 replicate
determinations at the 2.0 ìgL?1 Dy level was 2.2%
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
determinations at the 2.0 ìgL?1 Dy level was 2.2%
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
An enhancement factor of 50 was obtained for the preconcentration
of 50 mL of sample solution. The detection
limit value for the preconcentration of 50 mL of aqueous
solution of Dy was 0.03 ìgL?1. The precision for 10 replicate
determinations at the 2.0 ìgL?1 Dy level was 2.2%
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
determinations at the 2.0 ìgL?1 Dy level was 2.2%
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
An on-line dysprosium preconcentration and
determination system based on the hyphenation of cloud
point extraction (CPE) to flow injection analysis (FIA) associated
with ICP?OES was studied. For the preconcentration
of dysprosium, a Dy(III)?2-(5-bromo-2-pyridylazo)-
5-diethylaminophenol complex was formed on-line at pH
9.22 in the presence of nonionic micelles of PONPE-7.5.
The micellar system containing the complex was thermostated
at 30 °C in order to promote phase separation,
and the surfactant-rich phase was retained in a microcolumn
packed with cotton at pH 9.2. The surfactant-rich
phase was eluted with 4 mol L?1 nitric acid at a flow rate
of 1.5mLmin?1, directly in the nebulizer of the plasma.
An enhancement factor of 50 was obtained for the preconcentration
of 50 mL of sample solution. The detection
limit value for the preconcentration of 50 mL of aqueous
solution of Dy was 0.03 ìgL?1. The precision for 10 replicate
determinations at the 2.0 ìgL?1 Dy level was 2.2%
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
determinations at the 2.0 ìgL?1 Dy level was 2.2%
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
An enhancement factor of 50 was obtained for the preconcentration
of 50 mL of sample solution. The detection
limit value for the preconcentration of 50 mL of aqueous
solution of Dy was 0.03 ìgL?1. The precision for 10 replicate
determinations at the 2.0 ìgL?1 Dy level was 2.2%
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
determinations at the 2.0 ìgL?1 Dy level was 2.2%
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
of 1.5mLmin?1, directly in the nebulizer of the plasma.
An enhancement factor of 50 was obtained for the preconcentration
of 50 mL of sample solution. The detection
limit value for the preconcentration of 50 mL of aqueous
solution of Dy was 0.03 ìgL?1. The precision for 10 replicate
determinations at the 2.0 ìgL?1 Dy level was 2.2%
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
determinations at the 2.0 ìgL?1 Dy level was 2.2%
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
An enhancement factor of 50 was obtained for the preconcentration
of 50 mL of sample solution. The detection
limit value for the preconcentration of 50 mL of aqueous
solution of Dy was 0.03 ìgL?1. The precision for 10 replicate
determinations at the 2.0 ìgL?1 Dy level was 2.2%
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
determinations at the 2.0 ìgL?1 Dy level was 2.2%
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
?1 nitric acid at a flow rate
of 1.5mLmin?1, directly in the nebulizer of the plasma.
An enhancement factor of 50 was obtained for the preconcentration
of 50 mL of sample solution. The detection
limit value for the preconcentration of 50 mL of aqueous
solution of Dy was 0.03 ìgL?1. The precision for 10 replicate
determinations at the 2.0 ìgL?1 Dy level was 2.2%
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1. The method was successfully
applied to the determination of dysprosium in urine
applied to the determination of dysprosium in urine
relative standard deviation (RSD), calculated from the peak
heights obtained. The calibration graph using the preconcentration
system for dysprosium was linear with a correlation
coefficient of 0.9994 at levels near the detection
limits up to at least 100 ìgL?1