DETERMINATION OF CADMIUM IN TOBACCO BY SOLID SURFACE FLUORESCENCE USING NYLON MEMBRANES COATED WITH CARBON NANOTUBES

TALÍO, MARÍA CAROLINA; ALESSO, MAGDALENA; ACOSTA, MARIANO; OLSINA, ROBERTO; FERNANDEZ, LILIANA

TALANTA

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2013 vol. 107 p. 61 - 66

0039-9140

A new methodology based on fluorescent signal enhancement of o-cresolphthalein (o-CPT) for traces of cadmium determination is proposed. The dye was retained on membrane filters in the presence of a  micellar surfactant solution of carbon nanotubes (CNTs). All the experimental variables that influence   both the preconcentration procedure and the fluorimetric sensitivity were carefully optimized. The    calibration graph using zeroth order regression was linear from 6.5 ng L À 1 to 5.65 Â 105 ng L À 1, with a      correlation coefficient higher than 0.999. Under optimal conditions, the limits of detection and       quantification were of 2 ng L À 1 and 6.5 ng L À 1. respectively. The proposed method showed good          sensitivity and selectivity, with good tolerance to foreign ions, and it was applied to the determination         of trace amounts of cadmium in leachate from cigarettes? tobacco samples with satisfactory results. The          trueness of the recommended procedure was assessed through parallel analysis of the samples with         electrothermal atomization atomic absorption spectrometry. This methodology represents an innova-        tive and attractive application of membrane filters that enables metal traces determination by solid         surface fluorescence.