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我们在测定含镍20%的合金铸铁时,试验了用氟化物掩蔽大量的铁以及稀土、钛、铝等元素,三磷酸盐掩蔽锰,于酸性溶液中EDTA络合镍,铜盐返滴法测定,获得了较为满意的结果。分析方法一试剂稀王水:一份盐酸和一份硝酸与二份水混合。1-(2-吡啶偶氮)-2-萘酚:0.2%,20%的乙醇溶液。三磷酸盐:0.2M,制备方法见后。硫酸铜标准溶液:0.01M,称取CuSO_4·5H_2O2.4968克溶于水中,于量瓶中稀至1升.二操作方法称取试样0.05～0.1克于250毫升锥形瓶中,加稀王水5～10毫升,加热溶解,煮沸赶氧化氮。冷却,
When testing 20% alloy cast iron with nickel, we tested a large amount of iron, rare earth, titanium, aluminum and other elements covered with fluoride, masked manganese with triphosphate, EDTA complexed nickel in acid solution, Determination, obtained more satisfactory results. Analytical methods A reagent dilute aqua regia: a hydrochloric acid and a nitric acid mixed with two parts of water. 1- (2-pyridylazo) -2-naphthol: 0.2%, 20% ethanol solution. Triphosphate: 0.2M, see the preparation method. Copper sulfate standard solution: 0.01M, weighed CuSO_4 · 5H_2O2.4968 grams dissolved in water, dilute to 1 liter in the flask. Two methods Weigh the sample 0.05 to 0.1 grams in 250 ml Erlenmeyer flask, add dilute Aqua 5 to 10 ml, heated to dissolve, boil nitrogen oxide. cool down,