Two-dimensional gas chromatography coupled to isotope ratio mass spectrometry for determining high molecular weight polycyclic aromatic hydrocarbons in sediments
Copyright © 2023 Elsevier B.V. All rights reserved..
The accuracy of compound-specific isotope analysis (CSIA) of trace-level pollutants in complex environmental samples has always been limited by two main challenges: poor chromatographic separation and insufficient amounts of analytes. In this study, a two-dimensional gas chromatography-isotope ratio mass spectrometry (2DGC-IRMS) system was constructed for compound-specific δ13C analysis of high molecular weight polycyclic aromatic hydrocarbons (HMW-PAHs) in estuarine/marine sediments. This construction occurred through hyphenating an extra gas chromatography system (GC) to a conventional GC-IRMS using a commercially available multi-column switching-cryogenic trapping system (MCS-CTS). Compared with the previous 2DGC-IRMS strategy, which utilizes a Deans Switch device, the newly implemented 2DGC-IRMS scheme resulted in online purification of target analytes as well as enriched them online via duplicate injection and cryogenic trapping in CTS; this resultingly lowered the limits of detection (LOD) of CSIA. To improve the sample transfer efficiency to the IRMS, a broader-bore and longer fused-silica capillary was utilized to replace the original sample capillary running from the sample open split to the IRMS. A ẟ13C analysis of PAH standards showed accurate ẟ13C values, and high precisions (standard deviations 0.13-0.37%) were achieved, with the LOD of HMW-PAHs reduced to at least 1.0 mg/L (i.e., 0.07 to 0.09 nmol carbon per compound on-column). The successful application of this newly developed 2DGC-IRMS scheme provides a practical solution for the reliable CSIA of trace-level pollutants in complex environmental samples that cannot be measured using the conventional GC-IRMS system.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2023 |
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| Erschienen: |
2023 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:1693 |
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| Enthalten in: |
Journal of chromatography. A - 1693(2023) vom: 29. März, Seite 463879 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Tian, Boyang [VerfasserIn] |
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| Links: |
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| Anmerkungen: |
Date Completed 13.03.2023 Date Revised 13.03.2023 published: Print-Electronic Citation Status MEDLINE |
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| doi: |
10.1016/j.chroma.2023.463879 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM353282820 |
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| 520 | |a Copyright © 2023 Elsevier B.V. All rights reserved. | ||
| 520 | |a The accuracy of compound-specific isotope analysis (CSIA) of trace-level pollutants in complex environmental samples has always been limited by two main challenges: poor chromatographic separation and insufficient amounts of analytes. In this study, a two-dimensional gas chromatography-isotope ratio mass spectrometry (2DGC-IRMS) system was constructed for compound-specific δ13C analysis of high molecular weight polycyclic aromatic hydrocarbons (HMW-PAHs) in estuarine/marine sediments. This construction occurred through hyphenating an extra gas chromatography system (GC) to a conventional GC-IRMS using a commercially available multi-column switching-cryogenic trapping system (MCS-CTS). Compared with the previous 2DGC-IRMS strategy, which utilizes a Deans Switch device, the newly implemented 2DGC-IRMS scheme resulted in online purification of target analytes as well as enriched them online via duplicate injection and cryogenic trapping in CTS; this resultingly lowered the limits of detection (LOD) of CSIA. To improve the sample transfer efficiency to the IRMS, a broader-bore and longer fused-silica capillary was utilized to replace the original sample capillary running from the sample open split to the IRMS. A ẟ13C analysis of PAH standards showed accurate ẟ13C values, and high precisions (standard deviations 0.13-0.37%) were achieved, with the LOD of HMW-PAHs reduced to at least 1.0 mg/L (i.e., 0.07 to 0.09 nmol carbon per compound on-column). The successful application of this newly developed 2DGC-IRMS scheme provides a practical solution for the reliable CSIA of trace-level pollutants in complex environmental samples that cannot be measured using the conventional GC-IRMS system | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a 2DGC-IRMS | |
| 650 | 4 | |a Estuarine/marine sediment | |
| 650 | 4 | |a HMW-PAHs | |
| 650 | 4 | |a Multi-column switching-cryogenic trapping system | |
| 650 | 4 | |a Trace pollutants | |
| 650 | 7 | |a Polycyclic Aromatic Hydrocarbons |2 NLM | |
| 650 | 7 | |a Carbon Isotopes |2 NLM | |
| 650 | 7 | |a Environmental Pollutants |2 NLM | |
| 700 | 1 | |a Gao, Shutao |e verfasserin |4 aut | |
| 700 | 1 | |a Zhu, Zhanjun |e verfasserin |4 aut | |
| 700 | 1 | |a Zeng, Xiangying |e verfasserin |4 aut | |
| 700 | 1 | |a Liang, Yi |e verfasserin |4 aut | |
| 700 | 1 | |a Yu, Zhiqiang |e verfasserin |4 aut | |
| 700 | 1 | |a Peng, Ping'an |e verfasserin |4 aut | |
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