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本文试验了铅锶共沉淀分离铅的方法,从而抑制了硫酸铅的溶失,提高了铅的回收率,尤其是对于铅含量在0.2～1%的试样、其回收率可提高到95%以上,而且不需要硫酸冒烟,使方法简化。在此基础上,拟定了在pH≈5.5条件下、EDTA测定铅的方法。分析手续称取试样1克置于300毫升烧杯中、加10毫升硝酸(1+1),低温加热溶解。如溶解不完全,加氢氟酸3～5滴、继续加热至液清。煮沸除去氮的氧化物,取下稍冷,加80毫升水、12毫升浓硫酸,煮沸。在不断搅拌下,慢速逐滴加入1毫升硝酸锶(10%约15滴)。继续搅拌3～5分钟,取下放
In this paper, the lead-strontium coprecipitation method for the separation of lead, thereby inhibiting the dissolution of lead sulfate, increased lead recovery, especially for the lead content of 0.2 to 1% of the sample, the recovery rate can be increased to 95% Above, and does not require sulfuric acid smoke, so that the method is simplified. On this basis, the method of EDTA determination of lead at pH≈5.5 was developed. Analysis procedures Weigh the sample 1 g was placed in a 300 ml beaker, add 10 ml of nitric acid (1 +1), low temperature heating to dissolve. Such as incomplete dissolution, hydrofluoric acid 3 to 5 drops, continue heating to liquid. Boil to remove nitrogen oxides, remove slightly cold, add 80 ml of water, 12 ml of concentrated sulfuric acid and boil. With constant stirring, 1 ml of strontium nitrate (10% drop of about 15 drops) was slowly added dropwise. Continue stirring for 3 to 5 minutes, remove the release