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Volume 32 Issue 1
Mar.  2013
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Article Navigation >  CARSOLOGICA SINICA  > 2013  >  32(1): 117-122
SUN Hai long, LIU Zai hua, YAN Hao, YANG Rui, ZENG Cheng, WANG Hai jing. Comparison to the δ13C value in dissolved inorganic carbons extracted with different methods[J]. CARSOLOGICA SINICA, 2013, 32(1): 117-122. doi: 10.3969/j.issn.1001-4810.2013.01.017
Citation: SUN Hai long, LIU Zai hua, YAN Hao, YANG Rui, ZENG Cheng, WANG Hai jing. Comparison to the δ13C value in dissolved inorganic carbons extracted with different methods[J]. CARSOLOGICA SINICA, 2013, 32(1): 117-122. doi: 10.3969/j.issn.1001-4810.2013.01.017
shu

Comparison to the δ13C value in dissolved inorganic carbons extracted with different methods

doi: 10.3969/j.issn.1001-4810.2013.01.017

  • Institute of Geochemistry / State Key Laboratory of Environmental Geochemistry, CAS

  • Received Date: 2012-12-14
  • Publish Date: 2013-03-25
    Abstract
  • To obtain the δ13C values in dissolved inorganic carbon (DIC), the DIC is usually extracted from the water by the direct precipitation method or the gas evolution method. However, what is the difference between those measured δ13C values in DIC extracted with the two different methods, especially for the water samples with high CO2 partial pressure (pCO2)? Two groups of water samples representing endogenic karst system (with high pCO2) and epigenic karst system (with low pCO2) respectively are measured by the two methods. It is found that all of the measured δ13C values of DIC by the gas evolution method are higher than those by the direct precipitation method. This is resulted from the diffusive escape of CO2 from the water to the atmosphere when transferring the water to the glass vials in the laboratory because of the higher water pCO2 than that of the atmosphere. The finding demonstrates that the precision of the measured δ13C values by the direct precipitation method for DIC extraction is better than the gas evolution one. There is a linear positive correlation between the difference of the measured δ13C values of DIC by the two methods and the CO2 partial pressure difference between the water and the atmosphere. However, the linear correlation of the endogenic karst system is different with that of the epigenic karst system, the former having a higher constant term which is related to the increase of δ13C values of DIC caused by the de glassing of CO2 with low δ13C from vials. The linear correlations established here provide a possible calibration method for the measured δ13C values by using the gas evolution method, especially for the water samples taken from the endogenic karst system with high pCO2.

     

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