Direct determination of Cd and Pb in edible oils by atomic absorption spectrometry with transverse heated filter atomizer

Feasibility of filter atomization in high-resolution continuum source atomic absorption spectrometry

“…Taking into account this assumption, the investigation of analytical performances of the GFA in this work was undertaken using 40 mg of carbon fiber as collector. An examination of other than carbon fiber materials for collectors [20][21][22][23][24] was beyond the scope of this research. …”

“…Optical arrangement of the line source based AA instruments employed earlier with filter atomization [15][16][17][18][19][20][21][22][23][24] place rigorous restrictions on both parameters. Light losses due to reduced aperture of the light beam and intense radiation from the filter at high temperatures caused increase of noise from the photo detectors and, respectively, limited opportunities for the determination of less volatile elements.…”

“…Filter atomization in conventional AAS based on line sources was used as alternative to the traditional platform tube technique for the direct determination of high and medium volatile elements in samples associated with strong spectral and chemical interferences [11][12][13][14][15][16][17][18][19][20][21][22][23][24]. It provided reduction of interferences without involvement of chemical modifiers and the possibility for using larger sampling volumes of organic or inorganic liquids, while keeping the temperature program short.…”

“…It provided reduction of interferences without involvement of chemical modifiers and the possibility for using larger sampling volumes of organic or inorganic liquids, while keeping the temperature program short. Analytical characteristics of the transversely heated filter atomizer (THFA) have been verified in the analysis of organic extracts [18], fuels [19] and biological samples [20][21][22][23][24]. The atomizers were produced modifying commercial transversely heated graphite atomizers (Perkin Elmer) by furnishing the tube with filter and collector, instead of a platform.…”

Metal Determinations in Olive Oil

“…Al, Cr, Cd, Cu, Fe, Mn, Ni and Pb contents of olive oil were investigated using diethyl ether, methyl isobutyl ketone (MIBK), xylene, heptane, 1,4-dioxane as solvent and N,N-hexamethylenedithiocarbamic acid, hexamethyleneammonium (HMDC-HMA) salt as a modifier by ETAAS (Karadjova et al, 1998). A transverse heated filter atomizer (THFA) was employed for the direct determination of Cd and Pb in olive oil after sample dilution with nheptane (Canario & Katskov, 2005). Moreover, Martin-Polvillo et al (1994) and List et al (1971) determined trace elements in edible oils based on the direct aspiration of the samples, diluted in MIBK.…”