期刊
ANALYTICAL CHEMISTRY
卷 90, 期 20, 页码 12035-12041出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.8b02693
关键词
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资金
- JST CREST, Japan [JPMJCR13A4]
- JSPS [15KK0151, 18K12562, 18H02513, 25-1021, 28-0214, 24-6510]
- Grants-in-Aid for Scientific Research [18K12562, 18H02513, 15KK0151] Funding Source: KAKEN
We have improved a method for isolation and purification of individual amino acids for compound-specific radiocarbon analysis (CSRA). To remove high-performance liquid chromatography (HPLC) eluent blanks from isolated amino acid fractions prior to the radiocarbon (Delta C-14) measurement, each fraction was filtered through a membrane filter and then washed with diethyl ether twice. Radiocarbon measurements on standard amino acids processed and purified with the above method using elemental analyzer-accelerator mass spectrometry resulted in Delta C-14 values that were in strong agreement (R-2 = 0.998) with the original Delta C-14 value of each amino acid standard. From these measurements, we calculate dead and modern carbon contamination contributions as 1.2 +/- 0.2 and 0.3 0.1 mu gC, respectively, which are consistent with direct assessments of HPLC procedural blanks of 1.0 +/- 0.8 mu gC per sample. These contamination constraints allow correction of measured Delta C-14 values for accurate and precise CSRA and are widely applicable to future archeological and biogeochemical studies.
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