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首页> 外文期刊>Contributions to Mineralogy and Petrology >Overcoming problems of density and thickness measurements in FTIR volatile determinations: a spectroscopic approach
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Overcoming problems of density and thickness measurements in FTIR volatile determinations: a spectroscopic approach

机译：FTIR挥发物测定中克服密度和厚度测量的问题：一种光谱方法

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The Beer-Lambert law is traditionally used to determine water and carbon concentrations in glasses from their infrared (IR) spectra. In practice, this method requires estimation of the thickness and density of the glass as well as the calibration of the molecular absorptivities of the species concerned. All of these parameters can be sources of practical difficulties and analytical uncertainty. These weaknesses in the application of the Beer-Lambert law have been overcome by an empirical analysis of the infrared spectra. Using a set of 292 spectra obtained on 113 natural and experimental tholeiitic glasses (SiO_2 48.5-51 wt percent; water contents 04000 ppm H_2O), it can be shown that the thickness-density (#rho# d) product of a glass sample can be directly and reliably inferred from its IR spectrum. This allows the Beer-Lambert law to be rewritten. The new form no longer requires thickness or density estimations to determine volatile contents. Moreover, if needed, the thickness of the glass slab can also be ac-curately determined from the IR spectra. This new method is developed for quantitative determination of water concentrations in MORB glasses but can also be applied to any minor species (carbon, sulfur, etc.) provided it is active in the IR domain and that a suitable independent frequency of IR absorption can be identified. Precision is about 60 ppm H_2O on O-H contents. This method, tested on natural and experimental MORB-type glasses, can be applied to any chemical composition provided a set of reference spectra is available.
机译：传统上使用Beer-Lambert定律根据其红外（IR）光谱确定玻璃中的水和碳浓度。实际上，该方法需要估计玻璃的厚度和密度以及相关物种的分子吸收率的校准。所有这些参数都可能带来实际困难和分析不确定性。通过对红外光谱进行经验分析，克服了应用Beer-Lambert定律的这些弱点。使用在113个天然和实验性可塑玻璃（SiO_2 48.5-51 wt％;水含量04000 ppm H_2O）上获得的一组292个光谱，可以证明玻璃样品的厚度-密度（＃rho＃d）产品可以从其红外光谱中直接可靠地推断出。这允许重写比尔-朗伯定律。新形式不再需要厚度或密度估计来确定挥发物含量。此外，如果需要，还可以根据红外光谱准确地确定玻璃板的厚度。此新方法用于定量测定MORB玻璃中的水含量，但也可以应用于任何次要物种（碳，硫等），只要它在红外范围内具有活性，并且可以适当独立地吸收红外频率即可。确定。 O-H含量的精密度约为60 ppm H_2O。如果可以使用一组参考光谱，则可以在自然和实验MORB型玻璃上测试该方法，并将其应用于任何化学成分。

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