强碱分离EDTA络合滴定法测定铝锆炭质耐火材料中三氧化二铝

Determination of Al_2O_3 in Al_2O_3-ZrO_2-C refractories by alkali separation EDTA complexometric titration

试验证明，强碱分离ＥＤＴＡ络合滴定法测定铝锆炭质耐火材料中Ａｌ２Ｏ３时的分离碱度为５％（过加１０ｍｌＮａＯＨ溶液），在沸水浴中保温５～１０ｍｉｎ；ＥＤＴＡ络合条件为：煮沸３～５ｍｉｎ，在２０～７０℃下滴定，六次甲基四胺缓冲溶液（ｐＨ＝５．５）加入量为１５ｍｌ．分析结果准确可靠。

In the determination of Al2O3 in Al2O3-ZrO2-C refractories by alkali separation EDTA complexometric titration,the separated alkalinity should be 5%(over added 10ml NaOH solution)and hathing and holding in boiling water for 5～10min.EDTA complexometric titration condition:boiling for 3～ 5min;titration at 20～70℃,edding 15ml hexmethyl4-ammonia buffering solution.The analyses result is accurate.