Jump to main content
Jump to site search

Issue 2, 2009
Previous Article Next Article

Determination of total selenium by multicommutated-flow hydride generation atomic absorption spectrometry. Application to cow's milk and infant formulae

Author affiliations

Abstract

A multicommutated flow system was designed and evaluated for the determination of selenium by hydride generation atomic absorption spectrometry (HG-AAS). It was applied to the determination of total selenium in samples of cow's milk (fluid and powder) and infant formulae. Linearity was satisfactory in the range up to 27.5 µg L−1 (h = 0.082 C + 0.0033, h = peak-height, absorbance, C = concentration in µg L−1, r2 = 0.999). Detection (3s) and quantification (10s) limits in solution were LD = 0.08 µg L−1 and LQ = 0.27 µg L−1, corresponding to LD = 3.2 µg kg−1 and LQ = 10.8 µg kg−1 in solid samples, and to LD = 0.8 µg L−1, LQ = 2.7 µg L−1 in fluid milk samples. Trueness was verified by analysis (n = 5) of two reference materials (NIST 1549, Non-fat Milk Powder and NIST 1846 Infant Formula). At the 95% significance level, results were statistically equivalent to the certified values. Instrumental precision (sr(%), n = 5) was in the range 1.4% to 11.7%, analytical precision (sr(%), n = 5) being 4.2 and 9.3% respectively for the determination of the above mentioned reference materials. The sampling frequency of the system was 160 hour−1.

Graphical abstract: Determination of total selenium by multicommutated-flow hydride generation atomic absorption spectrometry. Application to cow's milk and infant formulae

Back to tab navigation

Publication details

The article was received on 18 Jun 2009, accepted on 10 Sep 2009 and first published on 06 Oct 2009


Article type: Paper
DOI: 10.1039/B9AY00079H
Citation: Anal. Methods, 2009,1, 139-143
  •   Request permissions

    Determination of total selenium by multicommutated-flow hydride generation atomic absorption spectrometry. Application to cow's milk and infant formulae

    M. Pistón, J. Silva, R. Pérez-Zambra and M. Knochen, Anal. Methods, 2009, 1, 139
    DOI: 10.1039/B9AY00079H

Search articles by author

Spotlight

Advertisements