Determination of minor constituents in pyrrhotite using ion-exchange resin

UMEZAKI Yoshimi

doi:10.2116/bunsekikagaku.9.138

Dissolve 1g of powdered sample of pyrrhotite in conc. HCl followed by conc. HNO₃. The residue is treated with HF and H₂SO₄, and redissolved in HCl. After extracting almost all of Fe with ether, evaporate the solution to dryness. Dissolve the residue in 5 to 10 ml of 7N HCl. Pass the HCl solution through a strongly basic ion-exchange resin column. Collect 50 ml of 7N HCl effluent, in which Ca, Mg, Al, Ti, Mn and Ni are contained. Change the eluent to 5N HCl and collect 90 ml of effluent in which Cu and Co are contained. Then 50 ml of 2N HCl effluent containing about 80% of residual Fe are obtained. Finally, 80 ml of 0.5N HNO₃ effluent are obtained in which Zn and traces of Fe are contained.<BR>Determinations of these elements are carried out following the scheme shown in Fig. 3, i. e. by the photometric method for the elements of lower content, and by the chelometric titration for those of higher contents.<BR>By means of the presented method, as low as 0.01% of constituents in 1g of sample can be determined.

Determination of minor constituents in pyrrhotite using ion-exchange resin

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