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将铝酸镁镧(LNA)晶体横向切片,经酸洗、淬火和烘干,研细至200目,称取1.228克粉末与13克粉状焦硫酸钾混匀,移入铂坩埚中,铂坩埚在200、600和7500℃各恒温半小时,取出冷却后,用热水浸去融块,最后用水稀至1升。 铝及稀土总量的测定:取25ml溶液,加入30ml 0.02M EDTA、pH4.5缓冲溶液,煮沸5分钟,冷却后加等体积乙醇,以双硫腙为指示剂,用0.02M硫酸锌回滴,红色为终点。
The lanthanum aluminate (LNA) crystal transverse slice, pickling, quenching and drying, finely ground to 200 mesh, weighed 1.228 g powder and 13 g of powdered potassium pyrophosphate mix, moved into the platinum crucible, the platinum crucible At 200,600 and 7500 ℃ each temperature for half an hour, remove the cooling, leaching the melt with hot water, and finally diluted with water to 1 liter. Determination of total aluminum and rare earths: Take 25ml solution, add 30ml 0.02M EDTA, pH4.5 buffer solution, boil for 5 minutes, add an equal volume of ethanol after cooling, with dithizone as an indicator, with 0.02M zinc sulfate drop back , Red for the end.