中子活化分析大洋多金属结核标准物质的研究

Analysis of Pacific Polymetallic Nodule Reference Materials by Neutron Activation Analysis

采用中子活化分析相对＿Ｋ０法对研制的两个深海多金属结核标准物质ＧＳＰＮ＿２和ＧＳＰＮ＿３中的２６种主量和微量元素进行了定值测定，所得结果与初定值符合；对中子辐照自屏蔽效应进行了实验测定和理论计算，结果显示了很好的一致性；同时还对这两个多金属结核标准物中的Ａｓ、Ｂａ、Ｃｅ、Ｃｏ、Ｅｕ、Ｆｅ、Ｌａ、Ｌｕ、Ｍｎ、Ｍｏ、Ｎａ、Ｓｂ、Ｓｍ、Ｓｃ、Ｔｈ、Ｙｂ和Ｚｎ的取样量与取样误差关系进行了研究。结果表明，在ＧＳＰＮ＿２和ＧＳＰＮ＿３试样中分别有８种和１１种元素，在取样量１０ｍｇ时其取样误差小于１％。

Twenty six elements in two Chinese pacific polymetallic nodule reference materials, GSPN_2 and GSPN_3, were determined by hybrid K 0 _relative neutron activation analysis(NAA). Neutron flux self_shielding effect was corrected by both experiments and theoretical calculation. Sampling uncertainty as a function of sample weight was also studied for individual elements including As, Ba, Ce, Co, Eu, Fe, La, Lu, Mn, Mo, Na, Sb, Sm, Sc, Th, Yb and Zn in the two materials. The results indicate that the sampling uncertainties are less than 1% for 8 elements in GSPN_2 and 11 elements in GSPN_3 at sample weight of 10 mg.