Osterberg Erich C, Handley Michael J, Sneed Sharon B, Mayewski Paul A, Kreutz Karl J
Climate Change Institute, Sawyer Environmental Research Center, and Department of Earth Sciences, Bryand Global Sciences Building, University of Maine, Orono, Maine 04469, USA.
Environ Sci Technol. 2006 May 15;40(10):3355-61. doi: 10.1021/es052536w.
We present a novel ice/firn core melter system that uses fraction collectors to collect discrete, high-resolution (<1 cm/sample possible), continuous, coregistered meltwater samples for analysis of eight major ions by ion chromatography (IC), >32 trace elements by inductively coupled plasma sectorfield mass spectrometry (ICP-SMS), and stable oxygen and hydrogen isotopes by isotope ratio mass spectrometry (IRMS). The new continuous melting with discrete sampling (CMDS) system preserves an archive of each sample, reduces the problem of incomplete particle dissolution in ICP-SMS samples, and provides more precise trace element data than previous ice melter models by using longer ICP-SMS scan times and washing the instrument between samples. CMDS detection limits are similar to or lower than those published for ice melter systems coupled directly to analytical instruments and are suitable for analyses of polar and mid-low-latitude ice cores. Analysis of total calcium and sulfur by ICP-SMS and calcium ion, sulfate, and methanesulfonate by IC from the Mt. Logan Prospector-Russell Col ice core confirms data accuracy and coregistration of the split fractions from each sample. The reproducibility of all data acquired by the CMDS system is confirmed by replicate analyses of parallel sections of the GISP2 D ice core.
我们展示了一种新型的冰/雪芯融化器系统，该系统使用馏分收集器来收集离散的、高分辨率（可能低至<1厘米/样本）、连续的、共配准的融水样本，以便通过离子色谱法（IC）分析八种主要离子，通过电感耦合等离子体质谱仪（ICP-SMS）分析超过32种微量元素，并通过同位素比率质谱仪（IRMS）分析稳定的氧和氢同位素。新的连续融化与离散采样（CMDS）系统保存了每个样本的存档，减少了ICP-SMS样本中颗粒溶解不完全的问题，并且通过使用更长的ICP-SMS扫描时间并在样本之间清洗仪器，比以前的冰融化器模型提供了更精确的微量元素数据。CMDS的检测限与直接连接到分析仪器的冰融化器系统所公布的检测限相似或更低，适用于极地和中低纬度冰芯的分析。通过对洛根山探矿者-拉塞尔山口冰芯进行ICP-SMS分析总钙和硫，以及通过IC分析钙离子、硫酸盐和甲磺酸盐，证实了每个样本分离馏分的数据准确性和共配准。通过对GISP2 D冰芯平行部分的重复分析，证实了CMDS系统获取的所有数据的可重复性。
