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Researches showes that primary school students have insufficient understanding of the nature of science. Recent studies emphasise the importance of scientific argumentation. The aim of this research is to investigate the effect of argumentation on the levels of understanding of nature of science of primary school students in science lessons. Quasi experimental design was applied in this research which was studied with eighth grade students in primary school. Nature of science survey and pre-knowledge test were used for data gathering in this research which has been planned for two years. Data were analyzed with SPSS 12,0. Meaningful differences were found between argumentation based learning class and traditional learning class with respect to understanding levels of the nature of science (first practice F1-48=8,032; p=0,007; second practice F1-34=10,422; p=0,003). Scientific argumentation method is suggested as a usable method to teach the nature of science.

Flame atomic absorption spectrometric determination of iron, magnesium, strontium and zinc in 44 deciduous human teeth collected from the people with different ages was carried out by using K + La chemical mixture. Optimum concentration and concentration ratio of K + La mixture on the absorbance values of analytes in the Bone Ash SRM 1400 (NIST) were studied. Detection limits (LOD) of analytes in the absence or presence of K + La mixture and its components were determined and compared. Detection limits in the presence of K + La mixture are 11 mu g L-1 for Fe, 8.0 mu g L-1 for Mg, 6.3 mu g L-1 for Sr and 18 mu g L-1 for Zn. With K + La mixture proposed and FAAS, Bone Ash SRM 1400 material was analyzed and the results found were in agreement with the certified values. The percent recoveries were increased up to 102% for analytes. La + K mixture proposed was applied to the determination of Fe, Mg, Sr and Zn in tooth samples.