碳-13/碳-12比值的红外和质谱测量比较

William W. Wong
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引用次数: 10

摘要

用商业原型二极管激光红外分光光度计MAT i测量了20个呼气样品和10个储罐CO2样品的δ13C值(δ13C值为- 31.3 ~ +148.9% vs PDB)和3个呼气样品和10个储罐CO2样品的CO2浓度,并将结果与气相同位素比质谱法和气相色谱法进行了比较。使用MAT I系统计算13C/12C比和CO2浓度的精密度(6,n = 10)分别为0.2%和0.6%。
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Comparison of infrared and mass-spectrometric measurements of carbon-13/carbon-12 ratios

The δ13C values of 20 breath samples and 10 tank-CO2 samples (δ13C values ranged from −31.3 to +148.9% vs PDB) and the CO2 concentrations of three breath samples and 10 tank-CO2 samples were measured with a commercial prototype of a diode-laser i.r. spectrophotometer, MAT I. The results were compared with those obtained by gas-isotope-ratio mass spectrometry and by gas chromatography. Precisions (sx, n = 10) of 0.2% and 0.6% were calculated for 13C/12C ratios and CO2 concentrations, respectively, using the MAT I system.

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