摘要
以盐酸溶解高氯酸冒烟使试样溶解后,加入过量的氢氧化钠使镁、铁、锰生成氢氧化物沉淀,过滤与铝分离。定容,移取部分加入过量EDTA,在pH4左右,加热煮沸3 min,以PAN为指示剂,用硫酸铜标准溶液滴定过量的EDTA,然后加入氟化钠,再用硫酸铜标准溶液滴定取代出的EDTA,求得铝量。将过滤出的镁、铁、锰等氢氧化物沉淀,溶解并控制酸度,以铬黑T为指示剂,用EDTA标准溶液滴定镁量。
Hydrochloric acid was used to dissolve a sample with perchloric acid smoking, then superfluous sodium hydroxide was added to it to make magnesium, iron and manganese form hydroxide precipitation which was illtrated to separate from aluminium and contant-volumed. Part of it was taken and added to which was superfluous EDTA. At about pH4. it was heated and kept boiling 3 min. with PAN as an indicator the standard solution of copper sulfate was used to titrate superfluous EDTA. Sodium fluoride was added and then the standard solution of copper sulfate was used to titrate the substituted EDTA to get the content of aluminium. The filtrated hydroxides such as magnesium, iron and manganese were precipitated and dissolved, with their acidity kept in check , with chrome black T as an indicator, the standard solution of EDTA was used to titrate the content of magnesium.
出处
《莱钢科技》
2008年第5期66-68,共3页
Laigang Science & Technology
关键词
铝锰镁合金
稀盐酸溶解
铜试剂
EDTA滴定法
铝
镁
aluminium-manganese-magnesium alloy
dissolved with dilute hydrochloric acid
reagent ot copper
EDTA titrimetric method
aluminium
magnesium
