1. State Key Laboratory of Organic Geochemistry
2. Guangzhou Institute of Geochemistry
3. Chinese Academy of Sciences
4. Guangzhou 510 640
5. China
6. Institute of Mass Spectrometry and Atmospheric Environment
7. Jinan University
8. Guangzhou 510632
9. Aix Marseille Univ.
10. CNRS
11. LCE
12. UMR 7376
13. Marseille
14. School of Environmental Science and Engineering
15. Shandong University
16. Qingdao