白令海和北冰洋海水中铱的阴离子交换预富集-中子活化分析  

Determination of Iridium in the Bering Sea and Arctic Ocean Seawaters by Anion Exchange Preconcentration-neutron Activation Analysis

作　　者：李世红[1] 毛雪瑛[1] 柴之芳[1] 

机构地区：[1]中国科学院高能物理研究所核分析技术重点实验室,北京100039

出　　处：《核化学与放射化学》2004年第2期125-128,共4页Journal of Nuclear and Radiochemistry

基　　金：国家自然科学基金资助项目(19935020);中国科学院创新工程资助项目(KJCX-N01)

摘　　要：研究了用阴离子交换预富集 中子活化法测定海水中铱的分析方法。192Ir示踪实验结果表明,在0 05～1 2mol/LHCl介质中,酸度越低越有利于树脂对Ir的吸附;阴离子交换法对pH=1 5的酸化海水中痕量Ir的回收率为89%;聚乙烯瓶和pH=1 5的酸化条件可以长期保存海水中的Ir。在超净实验条件下,用阴离子交换预富集 中子活化法测定了白令海和北冰洋垂直剖面样品中Ir的浓度,结果分别为(0 85～3 58)×10-12g/L(白令海,采集深度为0～3504m)和(1 26～1 97)×10-12g/L(北冰洋,采集深度为25～1900m),试剂空白值为(0 18～0 20)×10-12g/L。Anion exchange method is investigated to separate and enrich iridium in seawater by radiotracer^(192)Ir.The adsorption of Ir in the resin increases with the decreasing acidity in the 0.05～1.2 mol/L HCl media.The recovery of iridium in pH=1.5 seawater reaches 89% by a single anion-exchange column.The polyethylene contrainer of acidity of pH=1.5 are suitable for storing trace Ir in seawater.An anion exchange preconcentration-neutron activation analysis procedure is developed to determine (iridium) in seawaters sampled from the Bering Sea and Arctic Ocean at different depth.The reagent blank value of the whole procedures is (0.18～0.20)×10^(-12) g Ir.The iridium concentrations in the Bering Sea and Arctic Ocean seawater samples are (0.85～3.58)×10^(-12) g/L (0～3 504 m) and (1.26～1.97)×10^(-12) g/L (25～1 900 m),respectively.

关 键 词：白令海 北冰洋 海水 铱 阴离子交换 预富集 中子活化分析 海洋化学 地外物质 

分 类 号：P734.41[天文地球—海洋化学]