使用同位素比值法有着一个明显的局限因素，就是要用质谱仪进行分析。
An obvious restraint in the use of isotope ratios results from the need to employ mass spectrometers.
旧的GCIRMS单体碳同位素比值色谱质谱仪离子源高压放电故障频频发生，以致仪器不能正常工作。
The old GC IR MS didn't operate continuously because its fault of ion source high voltage discharge took place frequently.
旧的GCIRMS单体碳同位素比值色谱质谱仪离子源高压放电故障频频发生，以致仪器不能正常工作。
The old GC IR MS didn't operate continuously because its fault of ion source high voltage discharge took place frequently.
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