GISP2 Beryllium10 concentration, 719-2253 m

Melted water was collected from the outside of samples taken for cation and anion analysis by UNH. An aliquot was taken for anion analysis (chloride, nitrate, sulfate) and the remainder was weakly acidified with HNO3 to yield a final pH of about 2, Be, Cl and Al carriers were added. The Be (and Al and Cl) were concentrated from melted ice using ion exchange resins. Be was eluted from the cation exchange column, precipitated as Be(OH)2 and ignited to BeO for accelerator mass spectrometry (AMS) measurement. AMS measurements at the Lawrence Livermore National Laboratory Center for Accelerator Mass Spectrometry (Davis et al., 1990). The 10Be (half-life =1.5x10^6 years) concentration was normalized to an ICN standard after carrier blank and boron background correction.融水取自美国新罕布什尔大学（UNH）用于阴阳离子分析的样品外表面。分取部分融水用于阴离子（氯离子、硝酸根、硫酸根）分析；剩余部分用硝酸（HNO₃）弱酸化，使最终pH值约为2，并加入铍（Be）、氯（Cl）及铝（Al）载体。采用离子交换树脂从融冰中富集铍（同时富集铝与氯）。从阳离子交换柱上洗脱铍，将其以氢氧化铍（Be(OH)₂）形式沉淀后灼烧得到氧化铍（BeO），用于加速器质谱（Accelerator Mass Spectrometry，AMS）测试。加速器质谱测试于美国劳伦斯利弗莫尔国家实验室加速器质谱中心完成（Davis等，1990）。经载体空白与硼本底校正后，将¹⁰Be（半衰期为1.5×10⁶年）的浓度归一化至ICN标准。