Abstract
The author has studied quantitative spectrographic analysis with refcrenece to the following fundamental subjects, and has applied its results to practical analysis of various Al-alloys. The presparking time was varied with the respective metals, bbt at least seven minutes were required to get suitable results. The condition of sparking was most stable when special N-Form ø 3.5mm electrode was sparked at the distance of 2.5mm.
The infldence of spark discharging condition, which exerted upon the surface of electrode, was studied in regard to Al-Si (13%) And it was found that, when inductance was large, spark was discharged from the selected portion of electrode. In regard to the influcoce of other elements co-existing on the clement determination, was the effect of Si examined on the Mg determination in Al. Calibration curve of Mg in Al-alloys, when cotained Si also, parted from the straight line, but went back again as inductance increased.
The quantitative results of elements in various Al-alloys have been obtained in the following deviation: Si 5.9%, Ni 4-5% Cr 5.7%, Mn 4.9%, Mg 4.4%, Fe 6.7%, Cu 5.0%, Zn 2.9%, Ti 19.7%.
