Abstract
In determining trace elements by flame photometry, an extraction techinique with organic solvent has been introduced in order to eliminate the interferences of the other elements and to increase the sensitivity of the method.
In the present work, calcium oxinate was extracted with methyl isobutylketone and the microquantity of it in the extract was determined by flame photometry. The measurement of emission intensity of calcium was made at the wave length of 554 mμ or 622 mμ, under the hydrogen pressure of 2.0 1b/in2 and oxygen pressure of 25.0 1b/in2.
Barium and Na which interfered the flame photometric determination of Ca by aqueous solution did not disturb in this case.
The permissible amount of P was larger than in the case of aqueous solution.
Applying the present method to the determination of Ca in iron and steel, Ca could be determined down to 0.001 percent. In the present method the sensitivity for calcium was about 10 times higher than that obtained by flame photometry of aqueous solution.
