Improved Method for Determining the Stable-Hydrogen Isotopic Composition (δD) of Complex Organic Materials of Environmental Interest
Improved Method for Determining the Stable-Hydrogen Isotopic Composition (δD) of Complex Organic Materials of Environmental Interest
复制标题
测定具有环境意义的复杂有机材料的稳定氢同位素组成 (δD) 的改进方法
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
K. Hobson
中科院分区：
文献类型：
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作者：
L. Wassenaar;K. Hobson
尽管在环境研究中有越来越多的新应用，但复杂有机底物的稳定氢同位素（δD）组成的测定受到繁琐的制备技术和样品中不稳定氢与周围水蒸气之间不受控制的同位素交换的阻碍。迄今为止，在实验室准备、测量和校正复杂有机样品中不受控制的氢同位素交换的方式上，几乎没有一致意见，导致δD结果无法比较。以前，旨在控制可交换氢的硝化和制备平衡程序是为特定样品类型（例如纤维素，几丁质）设计的，但需要对单个样品进行大量处理。在这里，我们描述了一个静态的，高温制备平衡技术，提供增加的样品通量和δD测量，不受不受控制的同位素交换损害。通过采用这种方法，将有可能比较复杂的有机δ dme…
Despite new and increasing applications in environmental studies, determinations of the stable-hydrogen isotope (δD) composition of complex organic substrates are hampered by laborious preparation techniques and uncontrolled isotopic exchange between labile hydrogen in the sample and ambient water vapor. To date, there has been little agreement in the way laboratories prepare, measure, and correct for uncontrolled hydrogen isotopic exchange in complex organic samples, resulting in incomparable δD results. Previously, nitration and preparative equilibration procedures aimed at controlling exchangeable hydrogen were designed for specific sample types (e.g. cellulose, chitin) but required extensive processing of individual samples. Here we describe a static, high-temperature preparative equilibration technique that provides increased sample throughput and δD measurements that are not compromised by uncontrolled isotopic exchange. By adopting this approach, it will be possible to compare complex organic δD me...