Analyzing biases of nitrogen contents and δ<sup>15</sup>N values arising from acidified marine sediments with different CaCO<sub>3</sub> concentrations

PENG Yajun; LIU Dongyan; WANG Yujue; RICHARD Pierre; KEESING John K.

doi:10.1007/s13131-018-1188-2

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Article Navigation > Acta Oceanologica Sinica > 2018 > 37(8): 1-5

PENG Yajun, LIU Dongyan, WANG Yujue, RICHARD Pierre, KEESING John K.. Analyzing biases of nitrogen contents and δ15N values arising from acidified marine sediments with different CaCO3 concentrations[J]. Acta Oceanologica Sinica, 2018, 37(8): 1-5. doi: 10.1007/s13131-018-1188-2

Citation:

PENG Yajun, LIU Dongyan, WANG Yujue, RICHARD Pierre, KEESING John K.. Analyzing biases of nitrogen contents and δ¹⁵N values arising from acidified marine sediments with different CaCO₃ concentrations[J]. Acta Oceanologica Sinica, 2018, 37(8): 1-5. doi: 10.1007/s13131-018-1188-2

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Analyzing biases of nitrogen contents and δ¹⁵N values arising from acidified marine sediments with different CaCO₃ concentrations

doi: 10.1007/s13131-018-1188-2

1.
Key Laboratory of Coastal Zone Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China;School of Management Science, Guizhou University of Finance and Economics, Guiyang 550000, China
2.
Key Laboratory of Coastal Zone Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China;State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China
3.
Key Laboratory of Coastal Zone Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China
4.
Littoral, Environment et Sociétés, UMR 7266 CNRS-Université de La Rochelle, 2 rue Olympe de Gouges, La Rochelle 17000, France
5.
CSIRO Oceans and Atmosphere and University of Western Australia Oceans Institute, Indian Ocean Marine Research Centre, Crawley 6009, Australia

Received Date: 2017-05-26
Rev Recd Date: 2017-08-30

Abstract

Abstract

In some studies, the researchers pretreated and measured organic carbon, nitrogen and their isotopes (δ¹³C and δ¹⁵N) of marine sediment together, to save costs and resources of analysis. However, the procedure of acidification to remove inorganic carbon for analysing δ¹³C can affect the values of nitrogen and δ¹⁵N, and the biases vary a lot depending on the CaCO₃ contents of sediments. In this study, the biases of total nitrogen (TN) and δ¹⁵N values arising from acidified sediments were compared between the CaCO₃-poor (1%-16%) and CaCO₃-rich (20%-40%) samples. TN and δ¹⁵N values were altered during acid treatment (without centrifugation) that possibly led to N-containing compounds volatilization. For CaCO₃-poor samples, acidification led to a range of 0%-40% TN losses and 0‰-2‰ shift in δ¹⁵N values; and 10%-60% TN losses and 1‰-14‰ shift in δ¹⁵N values for CaCO₃-rich samples. The biases from most samples exceeded the precision of the instrument (0.002% for TN and 0.08‰ for δ¹⁵N), and high biases could mislead our judgment for the environmental implication of the data. Thus, avoiding co-analysis of organic carbon, nitrogen and their isotopes (δ¹³C and δ¹⁵N) in sediments, even for CaCO₃-poor marine sediments, is necessary.
- stable isotope nitrogen,
- nitrogen,
- CaCO₃,
- acidification,
- marine sediment

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References(22)

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