Online wet oxidation/isotope ratio mass spectrometry method for determination of stable carbon isotope ratios of water-soluble organic carbon in particulate matter.
Online wet oxidation/isotope ratio mass spectrometry method for determination of stable carbon isotope ratios of water-soluble organic carbon in particulate matter.
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DOI：
10.1002/rcm.8240
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发表时间：
2018-08
期刊：
影响因子：
--
通讯作者：
N. Suto;H. Kawashima
中科院分区：
文献类型：
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作者：
N. Suto;H. Kawashima
水溶性有机碳（WSOC）是由颗粒物（PM）中的有机化合物氧化形成的，占PM中有机碳的25-80%。稳定碳同位素比值（δ13 C）分析被广泛应用于PM的来源识别，但WSOC的δ13 C值测定复杂且需要耗时的预处理过程。方法建立了在线湿式氧化/同位素比值质谱分析方法，缩短了预处理时间。用此方法测定了WSOC的δ13 C值。结果该方法对左旋葡萄糖具有较高的准确度（0.1‰）和精密度（0.1‰），且检测限低，可用于WSOC分析。使用该方法，我们测定了2017年7月至11月期间在日本收集的PM2.5样品中WSOC的δ13 C值，发现该值范围为-26.5‰至-25.0‰（平均值为-25.8‰）。结论该方法操作简单、空白值低，可用于PM2. 5中WSOC δ13 C值的快速定量分析。建议将该在线方法作为WSOC δ13 C分析的标准方法。
RATIONALE Water-soluble organic carbon (WSOC) is formed by oxidation of organic compounds in particulate matter (PM) and accounts for 25-80% of the organic carbon in PM. Stable carbon isotope ratio (δ13 C) analysis is widely used to identify the sources of PM, but determining the δ13 C values of WSOC is complicated and requires a time-consuming pretreatment process. METHODS We have developed an online wet oxidation/isotope ratio mass spectrometry method with a reduced pretreatment time. We have measured the δ13 C values of WSOC by using this method. RESULTS The method showed high accuracy (0.1‰) and precision (0.1‰) for levoglucosan, and the limit of detection was sufficiently low for WSOC analysis. Using this method, we determined δ13 C values of WSOC in PM2.5 samples collected in Japan during the period from July to November 2017 and found that the values ranged from -26.5‰ to -25.0‰ (average, -25.8‰). CONCLUSIONS Our simple, low-blank method could be used for rapid quantitative analysis of the δ13 C values of WSOC in PM2.5 . We propose that this online method be used as a standard method for δ13 C analysis of WSOC.