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用硝酸分离钨产品中的主体钨,1克WO_3粉末经分离后溶液中残存的WO_3量都大于2毫克,若在此溶液中再加入少量硝酸试剂,试验表明残存的WO_3量可小于0.6毫克,分离效果显著提高。稍过量的硝酸试剂,经H_2O_2破坏后对测定无影响。本文采用该分离办法测定钨产品中的微量铝,分离效果好,灵敏度高,重现性好,操作简便。方法可应用于钨产品中0.0001—0.0x％铝的测定。试剂与仪器铝标准溶液:按常法配制成每毫升含1微克铝的标准溶液(pH≈2);乙酸-乙酸铵缓冲
The main tungsten in the tungsten product was separated by nitric acid. The amount of WO_3 remaining in the solution after the separation of 1 g of WO_3 powder was more than 2 mg. If a small amount of nitric acid reagent was added to the solution, the amount of residual WO_3 could be less than 0.6 mg, Separation effect increased significantly. A slight excess of nitric acid reagent, after H 2 O 2 damage has no effect on the determination. This separation method for the determination of trace aluminum in tungsten products, separation effect, high sensitivity, good reproducibility, easy to operate. The method is applicable to the determination of 0.0001-0.0x% aluminum in tungsten products. Reagents and Instruments Aluminum standard solution: prepared according to the standard solution containing 1 microgram of aluminum per milliliter standard solution (pH ≈ 2); acetic acid - ammonium acetate buffer