Synthetic reference material for direct analysis of solid biological samples by electrothermal atomic absorption spectrometry

Abstract

A reference material for the direct analysis of solid samples by electrothermal atomic absorption spectrometry (EAAS) was prepared by copreclpltatlon of eight metal Ions with magneslum(II) 8-qulnotlnate. The metal Ions were quantitatively recovered and the distribution of the metal Ions In the reference material was confirmed to be homogeneous. The reference material was more than adequate for muftlelemental analysis of biological samples by EAAS. For the analysis, an Inner miniature cup, which was placed Into a cupped-type graphite furnace, was also used. Analyses were conducted without any pretreatment of samples. The accuracy, precision, and limits of detection of the method are described. The accuracies obtained and the rapidity of the method permit the analysis of solid samples on a routine basis. The limits of detection for Al, Cd, Co, Cu, Mn, NI, Pb, and Zn In solids are 0.087, 0.008, 0.012, 0.05, 0.003, 0.043, 0.14, and 0.013 µ /g, respectively.

Estimation of the homogeneity of reference materials by SS-ETAAS and use of the "tape-sandwich" sample-introduction technique

“…Same authors [16,17] claim that aqueous standards are perfectly satisfactory at least for elements of high and medium volatility in matrices of low volatility, whereas most favour solid reference materials although large uncertainty might be introduced because of the poor homogeneity of these materials in sub-mg range. An artificial biological solid reference material of reasonably good homogeneity was prepared by Akatsuka and Atsuya and employed in the determination of Co in vitamin B 12 [18,19].…”

Preconcentration of Submicrogram Cobalt with 8-Quinolinol from Natural Waters for Electrothermal Atomic Absorption Spectrometry

“…The thermal conditions for EAAS were as same as those reported previously. 20 For measurements of the absorbance, at least five aliquots with different weights is the range 0.2 -3 mg were used, and the absorbance value corresponding to 1 mg of the precipitate was determined. Occasionally, to normalize the absorbances obtained in different concentration factors, we defined the total absorbances which were calculated from the above absorbance multiplied by the total weight of precipitate obtained.…”

Solid sampling analysis by flame atomic absorption spectrometry for lead determination in seawater samples after pre-concentration using cocrystallized alizarin red - naphthalene

“…Similar approaches using coprecipitation or synthetic materials for calibration have been previously proposed for Pb determination in water samples. [22][23][24] In these works very low detection limits were reported. However, in these procedures a graphite furnace, instead of a flame, was used as atomizer.…”