Abstract
Micro-determination of metals was made by flame photometric method, in which metals were changed into oxin complex and the extracted complex with organic solvent was directly derived into the flame.
The method was not only useful in removing of disturbing elements, but also effective for increasing the line intensity by a direct excitation of organic solvent in the oxygen-hydrogen flame and the sensitivity was much higher than in the case of aqueous solution. The oxin complex of manganese or copper was extracted with organic solvent, such as methyl isobutyl ketone, amylacetate, ethyl acetate or chloroform, the extract was derived into oxygen-hydrogen flame, and the line intensity of manganese was measured at 403.5 mμ and that of copper at 324.8 mμ. The intensities of flame under various conditions have been investigated for each solvent, and it was confirmed that the sensitivity could be increased 2030 times in case of manganese and 68 times in case of copper than in the case of aqueous solution by selecting optimal gaseous pressure for each solvent.
