チオシアン酸鉄-ゼフィラミンイオン対抽出による鉄の原子吸光分析

抄録

Anion of iron(III)-thiocyanate complex was quantitatively extracted into n-butyl acetate as a ion-pair with zephiramine cation. The procedure was as follows: To 95ml of sample solution containing up to 25μg of iron in a 200ml separatory funnel, and 5ml of hydrochloric acid (1+2), 10ml of 2.0M potassium thiocyanate solution, 10ml of 0.02M zephiramine solution and 10ml of n-butyl acetate were added. After shaking the vessel for 5 minutes, the organic phase was introduced into air-acetylene flame and absorbance was measured at 248.3nm. The iron of (225) μg could be determined by this method. The coefficient of variation was 0.7% for 20μg of iron(III) on a basis of 10 determinations. The presence of 2mg each of Ag(I), Al(III), Ba(II), Ca(II), Cd(II), Cr(VI), Cu(II), Hg(II), Mn(II), Mo(VI), Pb(II), 1mg each of Mg(II), Ni(II), V(IV), Zn(II) and 100μg of Sn(II) did not interfere with the determination of 20μg iron (III), but the presence of above 50μg of Pd(II) and 20μg of Co(II) interfered with the determination. The present method was applied to the determination of iron in waste water, aluminum alloy and copper alloy. Analytical results were satisfactory.