Recovery of organic matter from mineral-rich sediment and soils for stable isotope analyses using static dense media.
Recovery of organic matter from mineral-rich sediment and soils for stable isotope analyses using static dense media.
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DOI：
10.1002/rcm.4358
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发表时间：
2010-01
期刊：
影响因子：
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通讯作者：
C. Wurster;G. Saiz;A. Calder;M. Bird
中科院分区：
文献类型：
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作者：
C. Wurster;G. Saiz;A. Calder;M. Bird
有机质中的光稳定同位素(例如，d13C、d15N、d18O、DD、d34S)能够在环境科学中进行广泛的研究。1-3然而，有机质往往高度分散在矿物质丰富的沉积物和土壤中，因此很难可靠地分离出来进行分析。此外，水生和陆地沉积物都含有丰富的抗性聚合物，如纤维素、角蛋白和甲壳素，这些聚合物可能被回收用于多同位素替代测量，用于研究过去的环境变化。因此，分离没有矿物污染的有机物质以进行进一步的化学提纯将是有益的，特别是对于DD和D18O，在热解测量过程中，矿物可能会作为污染物。在土壤中，模拟土壤有机质(SOM)的碳氮循环需要将有机质分离和分配到不同停留时间的适当土壤库中，并将样品损失或交叉混合降至最低。
Light stable isotopes in organic matter (e.g., d13C, d15N, d18O, dD, d34S) enable a breadth of investigations in the environmental sciences.1–3 However, organic matter is often highly dispersed in mineral-rich sediment and soils, and is thus difficult to reliably isolate for analysis. Moreover, both aquatic and terrestrial sediments contain abundant resistant polymers such as cellulose, keratin, and chitin which can be potentially recovered for multi-isotope proxy measurements for use in investigating past environmental change. Isolation of organic material without mineral contamination for further chemical purification would thus be beneficial, particularly for dD and d18O, where minerals may serve as contaminants during measurement by pyrolysis. In soils, modelling the carbon and nitrogen cycling of soil organic matter (SOM) requires the separation and apportioning of the organic matter to appropriate soil pools of differing residence time with minimal sample loss or cross-mixing.