An injection spark excitation technique has been developed for the determination of the phosphorus content in vegetable oils by means of emission spectrography. 1 g oil was ashed in the presence of 0. 2 g basic magnesium carbonate, the residue was diluted with graphite powder in 1:1 ratio. This admixture was filled into a graphite tube electrode and excited by a low voltage spark using a plunger-electrode device. The calibration was carried out by natural standards, the magnesium matrix element being the internal reference. Detection limit of 0. 00062% P and 4. 8% R. S. D. in the 0. 003 to 0. 005% concentration range were found. The technique is also applicable for the determination of some other trace elements (iron, manganese, copper) in vegetable oils.
|Number of pages||11|
|Journal||Periodica Polytechnica Chemical Engineering|
|Publication status||Published - Jan 1 1977|
ASJC Scopus subject areas
- Chemical Engineering(all)