Abstract
Iron, cobalt and nickel in refined soybean oils were determined by neutron activation analysis followed by radiochemical purification of the resulting radioactive iron, cobalt and nickel.
After neutron irradiation of the oils in a small reactor of TRIGA-II type, followed by chemical separation based mainly on ion exchange of the iron and cobalt, the nickel was separated by Ni-dimethylglyoxime precipitation method. These elements were determined by β- decay and γ-spectrometory. The sensitivity limits were about × 10-7 grams for iron, × 10-8 grams for cobalt and × 10-9 grams for nickel when 13 grams samples are irradiated for 0.5150 hrs. in a thermal neutron flux of about 1012 n/cm2/sec.
