Determination of traces of silver in human scalp hair slurries by electrothermal atomic absorption spectrometry

Abstract

Abstract.A simple and rapid method for the determination of traces of silver in human hair by slurry sampling and electrothermal atomic absorption spectrometry was optimized. Hair pulverization and the particle size reduction were achieved using a vibrational zirconia mill ball for 20 min. Palladium nitrate, magnesium nitrate and palladium-magnesium nitrate were investigated as chemical modifiers to thermally stabilize silver. Glycerol was used as wetting agent to stabilize the hair slurries. A limit of detection of 21.6ggkg -1 was obtained for the use of palladium nitrate as best chemical modifier. The repeatibility of the overall procedure (slurry preparation and atomic absorption spectrometric determination) corresponding to eleven measurements was 14.3%. Matrix effect was significant and so, the standard addition method was used to determine silver in hair samples from healthy people. The levels found varied between 0.10 and 1.62mg kg -1.

On-line determination of silver in sea-water and marine sediment by inductively coupled plasma mass spectrometry

“…3,4,6 An average detection limit of 0.4 pg ml 21 was achieved. Bermejo-Barrera et al 9 undertook the direct determination of Ag in sea-water using GFAAS, reporting a detection limit of 0.5-1.1 ng ml 21 based on a 20 ml injection volume. Gornushkin et al 10 achieved a detection limit of 9 pg ml 21 for Ag determination in sea-water by laser excited atomic fluorescence spectrometry in combination with electrothermal atomization.…”

Atomic Spectrometric Techniques for the Analysis of Clinical Samples

“…Two reviews on the use of slurry sampling in the period 1990-2000 and on direct solid sampling in the period 1995-2005 were published [63,64]. In the first of the two reviews, one can see that human hair was the clinical sample most studied for determining Al and Mn [65], Hg [66], Pb [67], Ag [68], Cr [69], Ni [70], Cd [71] and also, Cd, Mn, and Pb in animal tissues [72], and Cd in microorganisms such as E scherichia coli and Pseudomona putrida [73]. In the second review, applications of solid sampling for Cd determination in kidney and liver [74] and for Cu and Zn in bovine liver were reported [75].…”

Application of factorial design and Doehlert matrix in the optimisation of instrumental parameters for direct determination of silicon in naphtha using graphite furnace atomic absorption spectrometry

“…6 Silicon is present in naphtha as polysiloxanes, which are used as antifoam products in several petroleum industry processes. In coked naphtha, silicon is present at a high concentration (w1.0 mg mL 21 ) and can easily be determined by flame atomic absorption spectrometry (FAAS) using a nitrous oxideacetylene flame. 7 For cracked naphtha, however, the silicon concentration is very low and FAAS cannot be used.…”

“…Multivariate techniques have been widely applied in the optimisation of methods in analytical chemistry. [16][17][18][19][20][21][22][23] However, in the optimisation of instrumental conditions for metal determinations using GFAAS these techniques have not been so widespread. Araujo et al 24 applied factorial design for optimisation of the instrumental variables in the determination of cadmium by GFAAS.…”