Changes of organic matter composition in surface sediments from the Pearl River estuary to the coastal South China Sea revealed by rapid molecular screening using FTICR-MS

Radović，Jagoš R.1; Xie，Wei2,3; Silva，Renzo C.1; Oldenburg，Thomas B.P.1; Larter，Stephen R.1; Zhang，Chuanlun4,5,6

2022-11-01

10.1016/j.orggeochem.2022.104505

ORGANIC GEOCHEMISTRY   Impact Factor & Quartile

0146-6380

1873-5290

The Pearl River drains the second largest watershed in China, funnelling large amounts of freshwater and organic matter into the northern part of the South China Sea through an estuary characterized by pronounced biogeochemical gradients. In this study we used a newly developed single injection Fourier transform ion cyclotron resonance mass spectrometry (FTICR-MS) method to analyze organic extracts of surface sediments transitioning from freshwater to marine settings in the Pearl River estuary and coastal South China Sea. Results show a complex mixture of molecular markers, with distinct fingerprints characterizing the freshwater and saline sites. Notable examples include steroidal and thiophenic species at the freshwater site, indicative of possible anthropogenic organic matter inputs from the continent; on the other hand, samples from the coastal site are uniquely characterized by putative tetrapyrrole species, indicative of phaeopigments sourced from marine phytoplankton. This study demonstrates the potential application of single injection FTICR-MS in rapidly probing the dynamic changes of organic matter sources and fates occurring in estuaries influenced by anthropogenic activities.

Biogeochemistry FTICR-MS Molecular markers Organic matter Pearl River estuary Sediment South China Sea

SCI

English

Others

Shenzhen Key Laboratory of Geo Omics of Archaea[ZDSYS201802081843490] ; National Science Foundation of China["92051117","41776137","42141003","91851210"]

Geochemistry & Geophysics

Geochemistry & Geophysics

WOS:000869728400002

PERGAMON-ELSEVIER SCIENCE LTD

GEOSCIENCES

2-s2.0-85139338146

Scopus

1.Department of Geoscience,University of Calgary,Calgary,T2N 1N4,Canada
2.School of Marine Sciences,Sun Yat-sen University,Zhuhai,519082,China
3.Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai),Zhuhai,519082,China
4.Shenzhen Key Laboratory of Marine Archaea Geo-Omics,Southern University of Science and Technology,Shenzhen,China
5.Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou),Shenzhen,518055,China
6.Shanghai Sheshan National Geophysical Observatory,Shanghai,200062,China

Radović，Jagoš R.,Xie，Wei,Silva，Renzo C.,et al. Changes of organic matter composition in surface sediments from the Pearl River estuary to the coastal South China Sea revealed by rapid molecular screening using FTICR-MS[J]. ORGANIC GEOCHEMISTRY,2022,173.

Radović，Jagoš R.,Xie，Wei,Silva，Renzo C.,Oldenburg，Thomas B.P.,Larter，Stephen R.,&Zhang，Chuanlun.(2022).Changes of organic matter composition in surface sediments from the Pearl River estuary to the coastal South China Sea revealed by rapid molecular screening using FTICR-MS.ORGANIC GEOCHEMISTRY,173.

Radović，Jagoš R.,et al."Changes of organic matter composition in surface sediments from the Pearl River estuary to the coastal South China Sea revealed by rapid molecular screening using FTICR-MS".ORGANIC GEOCHEMISTRY 173(2022).