1956 Volume 20 Issue 12 Pages 683-687
In order to trace the possible cause of influence of extraneous elements, different quantities of Zn, Si, Sn, Mn and Cu were added to Al-Mg alloy and Zn, Si, Mn, Fe and Mg to Al-Cu alloy separately to check the variation in the ratio of the analysing line pair (ΔS) and the ratio of the fixing line pair (ΔSG) in binary and ternary systems. As the result, it has been confirmed that there are some cases when such an influence is experienced and also other cases when such an influence is not experienced. Also, in this study, the influence of the change in the pre-sparking time and the excitation condition has been studied and when a longer pre-sparking time is used, the influence has been decreased. When O. Feussner Spark Generator was used in the case of C=3000 cm, no remarkable difference was noticed between L=0.08 mH and 0.8 mH. The elements which affect the quantitative determination of Mg were Zn, Si and Cu and the elements which affect that of Cu were Zn, Sn, Mn and Mg. When the influence of extraneous elements was not noticed in ΔSG, then ΔS was not affected, either. Using an excitation apparatus which makes it possible to spark to an alloy in molten state, we checked the above solid metals which showed an influence of extraneous elements, but no such an influence was recognized in the case of molten state, thus it was confirmed that the influence by extraneous elements is a phenomenon which is caused by the surface condition of the electrodes.