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在過去西西伯利亞地質局中心試驗室的第五次方法討論會上就提出了擬定新的和改進舊有的快速化學分析法,現在又重擬定和審查了下列快速法。鍚 應用碘量法滴定二价的錫來測定鍚。銅、钼、砷或锑量的含量低於0.5～1％時,不干擾測定。鎢的含量大於4～5％時,它就要析出來,或者呈膠凝體狀態而和矽酸在一起,或者為金属鋁還原到低價氧化物。試樣用過氧化鈉或者用氫氧化鈉和金屬鈉熔融,該法經極譜法驗證得出十分滿意的分析結果。 銅 早在1952年我們就擬定了用在實驗室中測定銅的焦磷酸塊—碘量法分析過程与氟—碘塊基性醋酸塊測定銅的方法相似,但氟化銨為焦磷酸鈉所代替,銅的滴定則在滲液的PH為3～3.5時進行之。
At the Fifth Methodological Symposium of the Central Laboratory of the West-West Georgia Bureau of Geology, a new and improved old rapid chemical analysis was proposed and the following quick method has now been re-drawn and reviewed.钖 iodate titration method to determine the price of divalent tin 钖. Copper, molybdenum, arsenic or antimony content of less than 0.5 to 1%, does not interfere with the determination. When the content of tungsten is more than 4 to 5%, it is precipitated or gelled together with silicic acid or reduced to the lower oxide of metallic aluminum. The samples were either sodium peroxide or melted with sodium hydroxide and metallic sodium. This method was verified by polarography to give very satisfactory analytical results. Copper As early as 1952 we developed a method for the determination of copper pyrophosphate in the laboratory - the iodometric method was similar to the method for the determination of copper with the fluorine-iodine base acetic acid block, but the ammonium fluoride was sodium pyrophosphate Instead, the titration of copper is carried out when the pH of the exudate is between 3 and 3.5.