吸光光度法による純鉄中の極微量銅定量 : 純鉄中の極微量不純物分析法の研究(第9報)

概要

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For the determination of microamounts of copper (010μg) in pure iron, the bathocuproine photometric method is applied. The procedure is as follows. One tenth gram of sample is dissolved in 10ml of hydrochloric acid (1 : 1) with a few drops of hydrogen peroxide (30%). After 15ml of ammonium citrate solution (20%) is added, the pH of the solution is adjusted to about 6 with ammonia water. Two ml of hydroxylamine solution (10%), and 2ml of bathocuproine alcohol solution (0.1%) are added. After standing for 5 minutes, the solution is shaken with 5.00ml of chloroform for about 2 minutes. Copper is determined by measuring the absorbance of the organic layer at 477mμ against chloroform. Twenty micrograms of each element of Al, As, B, Ca, Ce, Co, Cr, Nb, Ni, Mg, Mn, Mo, P, Pb, Si, Sn, Ta, Ti, V, W, and Zn do not interfere.
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