Precise determination of Sr/Ca by laser ablation ICP-MS compared to ICP-AES and application to multi-century temperate corals
Precise determination of Sr/Ca by laser ablation ICP-MS compared to ICP-AES and application to multi-century temperate corals
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DOI：
10.2343/geochemj.2.0295
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发表时间：
2014-01-01
影响因子：
0.8
通讯作者：
Eggins, Stephen
中科院分区：
文献类型：
--
作者：
Kawakubo, Yuta;Yokoyama, Yusuke;Eggins, Stephen
珊瑚骨骼Sr/Ca组成是重建过去热带气候的有用工具。虽然基于溶液的ICP-AES已成为获得每月解析的Sr/Ca记录作为海面温度（SST）的替代的首选方法，但激光烧蚀ICP-MS（LA-ICP-MS）允许以更高的空间分辨率更快速且更精确地分析多个元素比率，并且测量可以容易地重复。然而，对于长珊瑚，该方法仍需改进。它适用于435岁的滨珊瑚从日本南部的温带地区。LA-ICP-MS和ICP-AES测定的Sr/Ca比值在10-15年的3个周期内具有很好的一致性。讨论了分辨率、数据处理和Sr/Ca-SST校准问题，并提出了一种确保LA-ICP-MS获得高精度Sr/Ca记录的复制策略。
Coral skeletal Sr/Ca compositions are valuable tools for the reconstruction of past tropical climate. While solution-based ICP-AES has become the preferred method to obtain monthly-resolved Sr/Ca records as proxy for sea-surface temperature (SST), laser ablation ICP-MS (LA-ICP-MS) allows a more rapid and still precise analysis of multiple elemental ratios at higher spatial resolution and, measurements can easily be replicated. However, the methodology still needs to be refined for long corals. It is applied here to a 435 year old Porites coral from the temperate region of southern Japan. Sr/Ca ratios measured by LA-ICP-MS and ICP-AES for three 10-15 yr periods are shown to be highly consistent. Resolution, data processing and Sr/Ca-SST calibration issues are discussed, and a replicate strategy is proposed to ensure high-precision Sr/Ca records from multi-century corals using LA-ICP-MS.