Determining Biogenic Content of Biogas by Measuring Stable Isotopologues (12)CH(4), (13)CH(4), and CH(3)D with a Mid-Infrared Direct Absorption Laser Spectrometer

A tunable laser absorption spectrometer (TLAS) was developed for the simultaneous measurement of δ(13)C and δD values of methane (CH(4)). A mid-infrared interband cascade laser (ICL) emitting around 3.27 µm was used to measure the absorption of the three most abundant isotopologues in CH(4) with a s...

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Detalles Bibliográficos
Autores principales: Kääriäinen, Teemu, Richmond, Craig A., Manninen, Albert
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5855934/
https://www.ncbi.nlm.nih.gov/pubmed/29414879
http://dx.doi.org/10.3390/s18020496
Descripción
Sumario:A tunable laser absorption spectrometer (TLAS) was developed for the simultaneous measurement of δ(13)C and δD values of methane (CH(4)). A mid-infrared interband cascade laser (ICL) emitting around 3.27 µm was used to measure the absorption of the three most abundant isotopologues in CH(4) with a single, mode-hop free current sweep. The instrument was validated against methane samples of fossil and biogenic origin with known isotopic composition. Three blended mixtures with varied biogenic content were prepared volumetrically, and their δ(13)C and δD values were determined. Analysis demonstrated that, provided the isotopic composition of the source materials was known, the δ(13)C and δD values alone were sufficient to determine the biogenic content of the blended samples to within 1.5%.

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