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掺钕磷酸盐玻璃,由于含有稀土,使磷的测定比较困难.前人曾报导过在硝酸介质中,加入过量铋盐与磷酸根生成沉淀,分离沉淀后,以EDTA标准溶液反滴过量铋盐间接测定磷酸根的方法,手续较为复杂.本文试验了不分离沉淀直接以EDTA反滴过量铋盐的方法.并且提出了加入乙酸络合稀土离子以消除稀土离子的干扰.改进后的方法简单快速,可满意地应用于掺钕磷酸盐玻璃中磷含量的测定. 试验步骤称取预先处理好的玻璃样品0.1克于50ml烧杯中,加入8ml(1+1)HNO_3加热溶解后,洗入100ml量瓶中冷却后以蒸馏水稀至刻度,摇匀.取20ml溶
Neodymium-doped phosphate glass, due to the presence of rare earth, the determination of phosphorus more difficult.Incentives have reported in the nitric acid medium, adding excess bismuth and phosphate to form a precipitate, the precipitate was separated, with EDTA standard solution excessive drop of bismuth The method of indirect determination of phosphate is more complicated.This paper tested the method of reverse titration of excess bismuth salt without EDTA precipitation and proposed the addition of acetic acid complex rare earth ions to eliminate the interference of rare earth ions.The improved method is simple and fast , Can be satisfactorily applied to the determination of phosphorous content in neodymium-doped phosphate glass.Procedure Weigh out 0.1g of pre-treated glass sample in 50ml beaker, add 8ml (1 + 1) HNO_3, After cooling the bottle diluted with distilled water to the mark, shake. Take 20ml dissolved