Acid treatment effects on the carbon stable isotope values of marine sediments

Peng Yajun; Wang Yujue; Liu Dongyan; Tang Danling

doi:10.3969/j.issn.0253-4193.2015.12.009

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Peng Yajun, Wang Yujue, Liu Dongyan, Tang Danling. Acid treatment effects on the carbon stable isotope values of marine sediments[J]. Haiyang Xuebao, 2015, 37(12): 85-92. doi: 10.3969/j.issn.0253-4193.2015.12.009

Citation:

Peng Yajun, Wang Yujue, Liu Dongyan, Tang Danling. Acid treatment effects on the carbon stable isotope values of marine sediments[J]. Haiyang Xuebao, 2015, 37(12): 85-92. doi: 10.3969/j.issn.0253-4193.2015.12.009

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Acid treatment effects on the carbon stable isotope values of marine sediments

doi: 10.3969/j.issn.0253-4193.2015.12.009

1.
Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China;Graduate University of Chinese Academy of Sciences, Beijing 100049, China
2.
Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China
3.
Laboratory for Tropical Marine Environment Dynamics, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510000, China

Received Date: 2015-06-01
Rev Recd Date: 2015-09-09

Abstract

Abstract

Carbon stable isotope ratio(δ¹³C) has been regarded as an important factor tracing the organic material sources in marine ecosystem. Prior to analysis,samples have to be decarbonated. Inorganic carbon content and component are different in different marine sediments,and appropriate decarbonate methods should be chosen to get exact results. This study compared the effects of three acid treatments on δ¹³C values during the decarbonation of estuarial and bay sediments with different inorganic carbon content. The results showed that for the first method(rinse method),6% H₂SO₃ and 1 mol/L H₃PO₄ could not remove inorganic carbon in high inorganic carbon content samples collecting from tropical estuarial and bay completely,while 2 mol/L HCl could remove inorganic carbon in all marine sediments completely. The second method(fumigation method) is not suitable for sediment samples with high inorganic carbon content from tropical estuarial and bay,but could be used for sediments with lower inorganic carbon content,and it showed that 9 h is the best fumigate time. δ¹³C values obtained from the third method(non-capsule method) showed more positive values compared to the other two methods,indicated that the third method did not damage the ¹³C enriched materials. Also the residual acid showed not impact the δ¹³C values in the third method. The third method is confirmed as the most appropriate acid treatment for decarbonation of marine sediments.
- carbon stable isotope ratio,
- decarbonation,
- sediments,
- inorganic carbon

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References

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