On the Determination of Copper and Bismuth in Ferro-Tungsten

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  • フェロタングステン中の銅およびビスマスの定量
  • フェロタングステン チュウ ノ ドウ オヨビ ビスマス ノ テイリョウ

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Abstract

This experiment was conducted for the purpose of establishing a method for a simple and accurate quantitative analysis of copper and bismuth in ferro-tungsten. First of all, the precipitation condition for copper and bismuth when using thionalide, a reagent in lieu of hydrogen sulfide, was studied. Next, the effect of the elements coexisting at the time of Cu-DDTC Method and BiI4− Method was observed.<BR>Thionalide is easier to handle and higher in separation accuracy compared with hydrogen sulfide.<BR>The thionalide complex salt of copper and bismuth will form quantitatively in a short period in a 1 to 2 N sulfuric acid solution containing tartaric acid. These complex salts are readily filtered, and the filtered precipitation can be washed with distilled water. As for the Cu-DDTC Method, there is no significant effect even if 0.5 mg each of antimony, tin, arsenic and lead, and 10 mg of tungsten are contained in the separated sample solution. The existence of bismuth will be harmful.<BR>However, if the determination of bismuth is performed, and corrections are made, it will not be necessary to separate the bismuth.<BR>In the BiI4− Method, there is no significant effect even in case 5 mg of copper and 0.5 mg each of antimony, tin, arsenic, and lead are contained in the separated solution.<BR>As a result of the experiment, the author was able to establish an analysing method which can be done in only one-third of the time required by the JIS Method and has a comparatively high accuracy. A quantitative analysis of copper and bismuth in actual samples were performed and satisfactory results were obtained.

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