Dual-carbon isotope analysis of benzene polycarboxylic acids for tracking black carbon across different environments
文献类型：期刊论文
| 作者 | Yi, Xin1; Zhong, Guangcai1; Geng, Xiaofei1; Tang, Jiao1; Lin, Boji1,2; Zhu, Sanyuan1; Gao, Shutao1 ; Yao, Chuxin1,2; Cheng, Zhineng1; Zhao, Shizhen1
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| 刊名 | APPLIED GEOCHEMISTRY
 |
| 出版日期 | 2024-09-01 |
| 卷号 | 170页码:8 |
| 关键词 | Black carbon BPCA method Stable carbon isotope Radiocarbon Biogeochemistry |
| ISSN号 | 0883-2927 |
| DOI | 10.1016/j.apgeochem.2024.106062 |
| 英文摘要 | Black carbon (BC) is ubiquitous in the environment and is a significant component of the refractory carbon pool. However, its sources, biogeochemical processes, and environmental residence times are poorly understood. One important reason is that the technical protocols for isolating/analyzing BC vary across different matrices, thereby bringing inconsistency among studies on BC in different environment media. Benzene polycarboxylic acids (BPCA), produced by nitric acid oxidation of the condensed aromatic structure that is common in BC and BC-like substances, has been proven to be a useful molecular proxy for tracking BC in the Earth's surface. Here, we introduce a new technical approach for the compound-specific dual-carbon isotope (813C and A14C) analysis of BPCA. The BPCA compounds are isolated using preparative liquid chromatography, in which trifluoroacetic acid is used in the mobile phase instead of phosphoric acid. This allows complete removal of solvent from the isolated BPCA fraction, so that conversion of BPCA isolates into CO2 can be done by conventional oxidation methods for off-line Delta 14C analysis with accelerator mass spectrometry. Liquid chromatography (void column)-stable carbon isotope ratio mass spectrometry is employed to measure 813C of the isolated BPCA, leaving as much BPCA carbon amount as possible for 14C analysis. Blockage of oxidation chamber due to incomplete oxidation of other organic acids in the samples is avoided thanks to preliminary isolation of BPCA. We tested the approach by applying it to solid and dissolved BC species in a suite of environmental reference materials, including maize char, coal, riverine natural organic matter (NOM 2R101N), marine sediment (SRM 1941b), urban dust (SRM 1649b), and coke-polluted soils. We assessed the offsets of BPCA-813C and BPCA-A14C values caused by procedural carbon contaminations to correct measured carbon isotopic values. Paired 813C-A14C data of individual BPCA were plotted to validate and demonstrate the ability of this dual carbon isotope technique in tracking BC across different environmental matrices. We observed slightly different 813C-A14C signatures among individual BPCA, indicating that the less condensed BC may have younger apparent radiocarbon ages. |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001252997500001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/78342]  |
| 专题 | 有机地球化学国家重点实验室 |
| 通讯作者 | Zhong, Guangcai; Zhang, Gan |
| 作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangdong Hong Kong Macao Joint Lab Environm Pollu, Hong Kong 510640, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yi, Xin,Zhong, Guangcai,Geng, Xiaofei,et al. Dual-carbon isotope analysis of benzene polycarboxylic acids for tracking black carbon across different environments[J]. APPLIED GEOCHEMISTRY,2024,170:8. |
| APA | Yi, Xin.,Zhong, Guangcai.,Geng, Xiaofei.,Tang, Jiao.,Lin, Boji.,...&Zhang, Gan.(2024).Dual-carbon isotope analysis of benzene polycarboxylic acids for tracking black carbon across different environments.APPLIED GEOCHEMISTRY,170,8. |
| MLA | Yi, Xin,et al."Dual-carbon isotope analysis of benzene polycarboxylic acids for tracking black carbon across different environments".APPLIED GEOCHEMISTRY 170(2024):8. |
入库方式： OAI收割
来源：广州地球化学研究所
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