大洋多金属结核中五氧化二磷分析方法

ANALYTICAL METHOD OF P 2O 5 IN THE OCEANIC POLYMETALLIC NODULES

试样经ＮａＯＨ熔融，水浸取后，使Ｆｅ、Ｍｎ、Ｃｕ、Ｃｏ、Ｎｉ等共存元素形成氢氧化物沉淀与磷分离，滤液中的磷用磷钼黄光度法测定．方法简便、快速、精密度好、准确度高．经对标准物质ＧＢＷ０７２４９测定，结果与推荐值吻合，ＲＳＤ（ｎ＝１０）＜１．４％．

NaOH was used as the melting agent to melt the samples at 650℃ for 7-10 min. When immersing in the water, the coexist elements such as Mn, Fe, Cu, Co, Ni were separated from the solution in the hydroxide precipitation, then P 2O 5 was determinated in the solution by phosphomolybdic yellow spectophotometry. This method was simple, rapid, precise and accurate. It was used to determinate P 2O 5 in the standard reference polymetallic nodules (GBW07249). The result agreed well with the recommended value, the RSD was less than 1.4%(n=10).