Determination of the H isotopic composition of individual components in fine-scale mixtures of organic matter and phyllosilicates with the nanoscale secondary ion mass spectrometry.
Determination of the H isotopic composition of individual components in fine-scale mixtures of organic matter and phyllosilicates with the nanoscale secondary ion mass spectrometry.
复制标题
使用纳米级二次离子质谱法测定有机物和层状硅酸盐的精细混合物中各个组分的 H 同位素组成。
DOI：
10.1021/ac301099u
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发表时间：
2012
影响因子：
7.4
通讯作者：
F. Robert
中科院分区：
文献类型：
--
作者：
L. Piani;L. Remusat;F. Robert
当有机物在纳米尺度上与粘土矿物混合时，即使使用纳米级二次离子质谱（NanoSIMS，50-100 nm）的标称空间分辨率，也不能直接测量两个含H相的单独D/H比。为了克服这一局限性，提出了一种新的分析方案的基础上去卷积的D（-）/H（-）和（16）OD（-）/（16）OH（-）离子比测量NanoSIMS。实际上，由于有机物和粘土的H（-）和（16）OH（-）的产率不同，理论上应该可以确定离子探针分析区域中这两种组分的混合比。使用具有不同D/H比的有机物，在纯样品中测定D（-）/H（-）和（16）OD（-）/（16）OH（-）离子比的相互依赖性。然后使用H（-）和（16）OH（-）产率和在纯有机物和粘土上测量的同位素比率，确定预期的D（-）/H（-）和（16）OD（-）/（16）OH（-）变化作为混合比例的函数。这些数值预测与实验室制备的富含D的有机物和D-贫层状硅酸盐的混合物的测量结果是一致的，验证了所提出的实验方案及其用于陨石。随着离子比率的精度提高10倍，应该可以将该方案扩展到具有天然陆地D/H变化的样品。这种改进可以通过开发合成氘代参考样品来实现。
When organic matter is mixed on a nanometer scale with clay minerals, the individual D/H ratios of the two H-bearing phases cannot be directly measured even with the nominal spatial resolution of nanoscale secondary ion mass spectrometry (NanoSIMS, 50-100 nm). To overcome this limitation, a new analytical protocol is proposed based on the deconvolution of the D(-)/H(-) and (16)OD(-)/(16)OH(-) ionic ratios measured by NanoSIMS. Indeed, since the yields of H(-) and (16)OH(-) are different for organics and clays, it should be theoretically possible to determine the mixing ratio of these two components in the area analyzed by the ion probe. Using organics with different D/H ratios, the interdependence of the D(-)/H(-) and (16)OD(-)/(16)OH(-) ionic ratios was determined in pure samples. Then using the H(-) and (16)OH(-) yields and the isotopic ratios measured on pure organic matter and clays, the expected D(-)/H(-) and (16)OD(-)/(16)OH(-) variations as a function of the mixing proportions were determined. These numerical predictions are consistent with measurements on laboratory prepared mixtures of D-rich organic matter and D-poor phyllosilicates, validating both the proposed experimental protocol and its use for meteorites. With an improvement of the precision of the ionic ratios by a factor of 10, it should possible to expend this protocol to samples having natural terrestrial D/H variations. Such an improvement could be attainable with the development of synthetic deuterated reference samples.
雷穆萨特和巴赞之间
DOI：
--
发表时间：
2007
期刊：
影响因子：
--
作者：
ジャン=クリスチャン・プチフィス(学術翻訳:訳者 玉田敦子;橋本;坂口;真部);梅垣 千尋;梅垣 千尋;梅垣 千尋;梅垣 千尋;梅垣 千尋;杉浦 理恵;ONO AYA;小野 文;小野文;小野 文
通讯作者：
小野 文