高純度トリウム化合物中の鉄の光度定量第4報(トリウム中の不純物の定量) : チオシアン酸発色光度法

概要

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A method has been studied for the photometric determination of iron (>ca 1ppm Fe/ThO_2) in thorium oxide or nitrate of the reactor grade. A sample (1∿2g as ThO_2) is dissolved in 10ml nitric acid (1+1) and 3 drops of hydrofloric acid (1+9) using a 50ml platinum dish and evaporated to dryness under ultra-red lamps. The residue is dissolved in 4.2ml of nitric acid (3N) and several ml of water by gentle heating, cooled and transfered in a 25ml volumetric flask. After 0.5ml of aceton has been added as a stabilizer, 10ml of potassium thiocyanate (7.3%) is added. The solution is diluted to the mark, vigorously stirred for one min., and then set aside for about 40 minutes at room temperature. The solution is filtered through a small dry paper, and the absorbancy is measured at 480mμ. A reagent blank is run through the whole procedure. The calibration curve is derived from an experimental curve plotted using the same procedure and a standard series of iron solutions in which is added about the same amount of thorium compound as the sample itself, by substracting the effect of inevitable trace of Fe in the added thorium compound with an aid of vertical translocation of the curve.
山梨大学の論文
1961-12-20