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对于含镍量为75～80％的高电阻电热合金,我们用高锰酸钾容量法获得满意的结果。 分析步骤:称取20mg试样置于600ml烧杯中,加15～20ml王水,加热溶解后加5ml高氯酸,加热至冒白烟,使绿色溶液变成桔红色,取下稍冷,加少量水溶解盐类,加10ml酒石酸溶液(50％),混匀,用热水(90℃以上)稀至250ml,再煮沸,小心加50ml氨水(1+1),立即以细流状加入15ml丁二酮肟乙醇溶液(1％),振动1分钟,静
For high resistance electric alloys containing 75-80% nickel, we obtained satisfactory results with the potassium permanganate capacity method. Analysis steps: Weigh 20mg sample placed in 600ml beaker, add 15 ~ 20ml aqua regia, add 5ml perchloric acid heated to dissolve, heated to white smoke, the green solution turns orange, remove the cold, plus A small amount of water to dissolve the salt, add 10ml of tartaric acid solution (50%), mix, dilute to 250ml with hot water (above 90 ℃), and then boiled, carefully add 50ml ammonia (1 +1) Dimethylglyoxime ethanol solution (1%), vibration for 1 minute, static