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1 Ekologia i Technika

1 2003

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Oznaczanie metali ciężkich w zbożach metodą WD-XRF

Buczkowski R., Szymański T., Peszyńska-Białczyk K., Igliński B.

Ekologia i Technika

2003

R. 11, nr 2

25-30

Several calibration samples based on four crops commonly cultivated in Poland, i.e. barley, oat, rye and wheat have been prepared. Grinded grain matrix was artificially contaminated by addition of solution containing selected metals (Cd, Co, Cr, Fe, Mn, Ni, Pb, Zn). The contamination levels were following: 1, 5, 10, 15, 20, 30, 40 and 50 mg of metal per kg of dry contaminated material. So obtained calibration samples were used to create calibration graphs. The real concentration of studied metals was determinated by AAS and ICP methods. To validate the method - verify its sensitivity, reproducibility and accuracy - each calibration sample was made in three repetitions and measured twice. For each metal the calibration curve was made with regard to standard deviation and standard error. There have been also determinated confidence levels for 1-a=0,95. Calibration graph equations and their correlation coefficient were also calculated. In examined range for each metal was stated the existence of linear relation between concentration and analytical signal intensity. Correlation coefficient for all metals, except Cd and Zn, were higher than 0,97 what permits to conclude that the used method is suitable for such type of analysis. Using t-Student test it was proved that is no statistically significant differences between the insensitivity of the signals of studied metals in different matrixes.