高純度テルル中の銅の定量

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The determination of copper in high-purity tellurium was carried out, whereby copper was extracted with bathocuproine-chloroform from the solution of pH4.57.5 containing ammonium citrate (Fig. 2). The complex in chloroform has a maximum absorption at 477mμ (Fig. 1), and this was utilized for the spectrophotometric determination.<BR>The sample was dissolved in <I>aqua regia</I>, ammonium citrate was added and the solution was adjisted to pH6 with aqueous ammonia. Hydroxylamine hydrochloride and bathocuproine were added, allowed to stand for 15min, the complex was extracted with chloroform and the absorbance at 477mμ was measured for determination of copper. 2.9ppm of copper was found in commercial tellurium of 99.99% purity (Table VI).<BR>For tellurium of higher purity, 510g of sample were dissolved in nitric acid, a bulk of tellurium was removed as tellurous acid and the copper was determined as above. 0.11ppm of copper in 99.999% guaranteed tellurium was successfully determined (Table VIII).
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