extraction and determination of trace copper (ii) using octadecyl silica membrane disks modified 1-(2-pyridyl azo) 2-naphtol(pan) in water samples and paraffin-embedded tissues from liver loggerhead turtles specimens by faas

a simple and reproducible method for the rapid extraction and determination of trace amounts of copper(ii) ions using octadecyl-bonded silica membrane disks modified by 1-(2-pyridyl azo)2-naphtol(pan) and atomic absorption spectrometry was presented. the method was based on complex formation on the surface of the envi-18 disk tm disks followed by stripping of the retained species by minimum amounts of appropriate organic solvents. the elution was efficient and quantitative. the effect of potential interfering ions, ph, ligand amount, stripping solvent, and sample flow rate were also investigated. under the optimal experimental conditions, the break-through volume was found to about 1000ml providing a preconcentration factor of 500. in the present study, we reported the application of preconcentration techniques still continues increasingly for trace metal determinations by flame atomic absorption spectrometry (faas) for quantification of cu in formalin-fixed paraffin-embedded (ffpe) tissues from liver loggerhead turtles. the maximum capacity of the disks was found to be 389± 4 µg for cu 2+ .the limit of detection of the proposed method was 5ng per 1000ml.the method was applied to the extraction and recovery of copper in different water samples.