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Volume 36 Issue 3
Jun.  2017
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Article Navigation >  CARSOLOGICA SINICA  > 2017  >  36(3): 419-426
TANG Wei, WANG Hua, LAN Gaoyong, YANG Hui, WU Xia, TU Linling, YING Qihe. A study on the test conditions and influence factors in online-phosphoric acid method for carbon isotopes of dissolved inorganic carbon compounds in water samples by Gas Bench II-IRMS[J]. CARSOLOGICA SINICA, 2017, 36(3): 419-426. doi: 10.11932/karst20170315
Citation: TANG Wei, WANG Hua, LAN Gaoyong, YANG Hui, WU Xia, TU Linling, YING Qihe. A study on the test conditions and influence factors in online-phosphoric acid method for carbon isotopes of dissolved inorganic carbon compounds in water samples by Gas Bench II-IRMS[J]. CARSOLOGICA SINICA, 2017, 36(3): 419-426. doi: 10.11932/karst20170315
shu

A study on the test conditions and influence factors in online-phosphoric acid method for carbon isotopes of dissolved inorganic carbon compounds in water samples by Gas Bench II-IRMS

doi: 10.11932/karst20170315

  • Institute of Karst Geology, CAGS/Key Laboratory of Karst Dynamics,MLR&GZAR/ The International Research Center on Karst under the Auspices of UNESCO

  • Publish Date: 2017-06-25
    Abstract
  • The objects of this paper is to determine the test conditions and influencing factors in online-phosphoric acid method by using Gas Bench II-IRMS for carbon isotopes of dissolved inorganic carbon compounds in water samples. The equilibrium time, chromatographic column, sample condition, sample volume and the reaction temperature were analyzed comprehensively. The conclusions were as follows, (1) The best equilibrium time of the dissolved inorganic carbon isotope in the water sample was identified. (2)There is obviously positive correlation between inorganic carbon concentration and the sample test signal intensity. (3) In the process of sample testing, the temperature of chromatographic column can not only affect the appearance time of sample peak, but also affect the peak width ,peak height and the peak area, leading to different degrees of isotope fractionation. The samples should be kept under 25 ℃ in the reaction process, meanwhile, ±1 ℃ difference in temperature between room temperature and constant temperature sample plate is required .If the temperature difference is too large, there will be water vapor in the sample vial, which will not only lead to the isotope fraction of the sample, but also affect the service life of taking gas needle even lead to serious gas needle blocking. This method can be used to analyze the δ13C values of dissolved inorganic carbon in groundwater, surface water and meteoric water.

     

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