痕量锕系元素的精密测定——Ⅳ.微克量镎及镅的荧光络合滴定

PRECISE DETERMINATION OF TRACE ACTINIDES Ⅳ, FLUORESCENCE COMPLEXOMETRIC TITRA-TION OF A FEW MICROGRAMS OF NEPTUNIUM AND AMERICIUM

摘要: <正> 我们在文献1中,以痕量钍的精密测定为例,提出了痕量锕系元素的非常规荧光络合滴定法,并预料此法尚可用于痕量铀、镎、钚、镅和锔的精密测定。对铀的标准矿样及钚的分析基准物质的分析结果,均证实了方法的可靠性。本文简要报道应用此法于痕量镎及镅的精密测定结果,所用仪器及主要试剂同文献1中所述。

Abstract: The procedure of unusual fluorescence complexometric titration has been applied to the determination of a few micrograms of Np and Am. Np (Ⅴ) is pre-reduced to Np (Ⅳ) by NH2OH·HCl. The relative standard deviation for the determination of 5μg Np is less than ±0.5%; and that for 2μg Np or Am is less than±1%.