INVESTIGADORES
GIL raul andres
artículos
Título:
Study of matrix effects and spectral interferences in the determination of lead in sediments, sludges and soils by SR-ETAAS using slurry sampling
Autor/es:
MARIANELA SAVIO; SOLEDAD CERUTTI; LUIS D. MARTINEZ; PATRICIA SMICHOWSKI; RAÚL A. GIL
Revista:
TALANTA
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Año: 2010 p. 523 - 527
ISSN:
0039-9140
Resumen:
An interference-free, fast, and simple method is
proposed for Pb determination in environmental solid samples combining
slurry sampling and electrothermal atomic absorption spectrometry.
Samples were ground to an adequate particle size and slurries were
prepared by weighing from 0.05 g to 0.20 g of dry sediment, adding
nitric acid, and a solution containing 0.1% Triton X-100. Ultrasonic
agitation was employed for slurries homogenization. Analytical variables
including acid pre-treatment conditions, particle size, slurry
stability, temperature program of the graphite furnace, and type and
concentration of the chemical modifier were studied. The undesirable
effects of potential non-specific and spectral interferences on Pb
signal were also taken into account. Continuum source and self-reversal
methods for background correction were evaluated and compared. For
calibration, synthetic acid solutions of Pb were employed. Calibration
was linear within the range 1-30 μg L-1 and 5-30 μg L-1
when the 217.0 nm and 283.3 nm analytical lines were used. Correlation
coefficients of 0.9992 and 0.9997 were obtained. Using optimized
conditions, limits of detection (3σ) of 0.025 μg g-1 and 0.1 μg g-1
were achieved for the 217.0 nm and 283.3 nm analytical lines,
respectively. The method was successfully applied to the determination
of lead in soil, contaminated soil, municipal sludge, and sediment
samples. The accuracy was assessed by the analysis of two certified
reference materials: municipal sludge (QC MUNICIPAL SLUDGE A) and lake
sediment (TRAP-LRM from IJS)