INVESTIGADORES
FERNANDEZ Liliana Patricia
artículos
Título:
SURFACTANT ENHANCED CHEMOFILTRATION OF ZINC TRACES PREVIOUS TO THEIR DETERMINATION BY SOLID SURPHASE FLUORESCENCE
Autor/es:
VEGA, MABEL; AUGUSTO, MIRIAM; TALÍO, MARÍA CAROLINA; FERNANDEZ, LILIANA
Revista:
American Jornal of Analytical Chemistry
Editorial:
Scientific Research Publishing Inc.
Referencias:
Año: 2011 vol. 2 p. 902 - 911
ISSN:
2156-8251
Resumen:
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Surfactant enhanced chemofiltration on Nylon membranes pre-treated with hexadecyltrimethylammonium
bromide (HTAB) and eosin dye (eo) is proposed for zinc traces quantification by solid surphase spectro-
fluorimetry (SSF, λexc = 532 nm; λem = 548 nm). Operational variables which have influence on quantitative
retention of metal complex have been studied and optimized. At optimal experimental conditions, quantita-
tive recovery was reached with a detection limit of 0.662 pg·L?1 and quantification limit of 2.20 pg·L?1. The
calibration sensitivity was of 1.22 L·pg?1 for the new methodology with a linear range of 2.20 pg·L?1 to 779
pg·L?1 Zn (II). The tolerance levels of potential interfering ions were studied with good results. Recuperation
studies were carried out by standard addition method applied to natural water samples (San Juan, Argentine)
without previous treatment. The reproducibility (between-days precision) was also evaluated over 3 days by
performing five determinations each day. CV% was 0.37. The performing obtained in sensitivity and selec-
tivity thanks to chemofiltration step, converts the proposed methodology in an adequate alternative to con-
ventional techniques for Zn (II) traces determination.