The work demonstrates a novel analytical method for compound-specific carbon isotope analysis in organic compounds by gas chromatography hyphenated with MC-ICPMS. Precision down to 0.3‰ (1σ) was attained for analytes containing as low as 0.6 nmol of carbon. Tuning of MC-ICPMS was performed on the background signals for m/z 12 and m/z 13. MC-ICPMS was operated in a low-resolution mode (m/Δm ∼ 300) and the instrumental parameters were optimized for the minimum m/z 13 to m/z 12 ratio. Good agreement between the δ¹³C values measured for ethylene dibromide, 2-chloroethyl benzene and naphthalene by GC/MC-ICPMS and the values determined for these compounds by GC-C-IRMS was observed. Determination of the carbon isotope ratio in the VPDB scale, as well as the absolute ¹³C/¹²C values was performed by applying an internal standard with known carbon isotope ratio.

中文翻译：

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使用 GC/MC-ICPMS 分析有机化合物中的 δ 13 C 化合物特定同位素

该工作展示了一种通过气相色谱与 MC-ICPMS 联用对有机化合物中特定化合物的碳同位素进行分析的新方法。对于含碳量低至 0.6 nmol 的分析物，精度可低至 0.3‰ (1 σ )。MC-ICPMS 的调谐是在m / z 12 和m / z 13的背景信号上进行的。MC-ICPMS 在低分辨率模式 ( m /Δ m ∼ 300) 下运行，仪器参数被优化为最小m / z 13 与m / z 12 的比率。δ ¹³之间的良好一致性观察了通过 GC/MC-ICPMS 测量的二溴化乙烯、2-氯乙基苯和萘的 C 值以及通过 GC-C-IRMS 对这些化合物确定的值。通过应用具有已知碳同位素比的内标来确定 VPDB 标度中的碳同位素比值以及¹³ C/ ¹² C绝对值。