3.8. Analytical performance of the method
The calibration curve for Tl(I), based on optimal conditions,
was linear with a correlation coefficient of 0.9986 in the range
of 0.6–2.5 lg L1. Also in accordance with the definition of
IUPAC (Long and Winefordner, 1983), the detection limit of
this method, evaluated as the concentration corresponding to
three times the standard deviation of 11 runs measurements
of blank solution using the preconcentration method, was
found to be 87 ng L1 for Tl(I). The results (Table 2) show that
the precision of this method (RSD), examined by eight replicate
measurements of 1.5 lg L1 Tl(I) in 100 mL of model
solutions, was about 6.4% and indicating that the method
has good precision for the analysis of trace Tl(I) ions in solution
samples.
Table 3 compares the characteristic data of the present
method with some other methods reported in literatures. As
can be seen, the enrichment factor and detection limits obtained
by the present method are comparable to those reported
method, and it can be used efficiently for sample containing
thallium.
3.9. Application of the method on real waters
In order to establish the performance of preconcentration
method in determination of Tl(I) in real samples, two environmental
water samples (tap water and Mines lake water) were
collected from the region of Serdang city in Malaysia and used
for the mentioned analysis. In these experiments, the samples
were spiked with 1.0 and 2.0 lg L1 Tl(I) and subjected to
the preconcentration procedure. The results (Table 4) indicate
that proposed method could be used to determine thallium in
real water samples.
The method has been applied for the determination of Tl(I)
in the standard reference material (JR-1) for its thallium content
as well. The rock sample (0.5 g) was dissolved in 10 mL of
mixture of HF (25 mL), HNO3 (2 mL) and H2SO4 (8 mL) in a
teflon beaker, and heated until 2 mL of solution was remained.
Eight milliliters of concentrated HNO3 was added to this solution
and after heat treatment distilled water was added to give
a clear solution and was finally made to 100 mL by further
addition of distilled water. This solution was analyzed for its
Tl content according to the proposed procedure and was determined
to be 1.55± 0.18 lg g1 which is in good agreement
with its certified value (1.56 lg g1) with a recovery of 99.3%.
3.8. Analytical performance of the methodThe calibration curve for Tl(I), based on optimal conditions,was linear with a correlation coefficient of 0.9986 in the rangeof 0.6–2.5 lg L1. Also in accordance with the definition ofIUPAC (Long and Winefordner, 1983), the detection limit ofthis method, evaluated as the concentration corresponding tothree times the standard deviation of 11 runs measurementsof blank solution using the preconcentration method, wasfound to be 87 ng L1 for Tl(I). The results (Table 2) show thatthe precision of this method (RSD), examined by eight replicatemeasurements of 1.5 lg L1 Tl(I) in 100 mL of modelsolutions, was about 6.4% and indicating that the methodhas good precision for the analysis of trace Tl(I) ions in solutionsamples.Table 3 compares the characteristic data of the presentmethod with some other methods reported in literatures. Ascan be seen, the enrichment factor and detection limits obtainedby the present method are comparable to those reportedmethod, and it can be used efficiently for sample containingthallium.3.9. Application of the method on real watersIn order to establish the performance of preconcentrationmethod in determination of Tl(I) in real samples, two environmentalwater samples (tap water and Mines lake water) werecollected from the region of Serdang city in Malaysia and usedfor the mentioned analysis. In these experiments, the sampleswere spiked with 1.0 and 2.0 lg L1 Tl(I) and subjected to
the preconcentration procedure. The results (Table 4) indicate
that proposed method could be used to determine thallium in
real water samples.
The method has been applied for the determination of Tl(I)
in the standard reference material (JR-1) for its thallium content
as well. The rock sample (0.5 g) was dissolved in 10 mL of
mixture of HF (25 mL), HNO3 (2 mL) and H2SO4 (8 mL) in a
teflon beaker, and heated until 2 mL of solution was remained.
Eight milliliters of concentrated HNO3 was added to this solution
and after heat treatment distilled water was added to give
a clear solution and was finally made to 100 mL by further
addition of distilled water. This solution was analyzed for its
Tl content according to the proposed procedure and was determined
to be 1.55± 0.18 lg g1 which is in good agreement
with its certified value (1.56 lg g1) with a recovery of 99.3%.
การแปล กรุณารอสักครู่..

3.8. Analytical performance of the method
The calibration curve for Tl(I), based on optimal conditions,
was linear with a correlation coefficient of 0.9986 in the range
of 0.6–2.5 lg L1. Also in accordance with the definition of
IUPAC (Long and Winefordner, 1983), the detection limit of
this method, evaluated as the concentration corresponding to
three times the standard deviation of 11 runs measurements
of blank solution using the preconcentration method, was
found to be 87 ng L1 for Tl(I). The results (Table 2) show that
the precision of this method (RSD), examined by eight replicate
measurements of 1.5 lg L1 Tl(I) in 100 mL of model
solutions, was about 6.4% and indicating that the method
has good precision for the analysis of trace Tl(I) ions in solution
samples.
Table 3 compares the characteristic data of the present
method with some other methods reported in literatures. As
can be seen, the enrichment factor and detection limits obtained
by the present method are comparable to those reported
method, and it can be used efficiently for sample containing
thallium.
3.9. Application of the method on real waters
In order to establish the performance of preconcentration
method in determination of Tl(I) in real samples, two environmental
water samples (tap water and Mines lake water) were
collected from the region of Serdang city in Malaysia and used
for the mentioned analysis. In these experiments, the samples
were spiked with 1.0 and 2.0 lg L1 Tl(I) and subjected to
the preconcentration procedure. The results (Table 4) indicate
that proposed method could be used to determine thallium in
real water samples.
The method has been applied for the determination of Tl(I)
in the standard reference material (JR-1) for its thallium content
as well. The rock sample (0.5 g) was dissolved in 10 mL of
mixture of HF (25 mL), HNO3 (2 mL) and H2SO4 (8 mL) in a
teflon beaker, and heated until 2 mL of solution was remained.
Eight milliliters of concentrated HNO3 was added to this solution
and after heat treatment distilled water was added to give
a clear solution and was finally made to 100 mL by further
addition of distilled water. This solution was analyzed for its
Tl content according to the proposed procedure and was determined
to be 1.55± 0.18 lg g1 which is in good agreement
with its certified value (1.56 lg g1) with a recovery of 99.3%.
การแปล กรุณารอสักครู่..
