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    水体中痕量挥发性有机物单体碳同位素组成的固相微萃取-冷阱预富集GC-IRMS分析

    刘国卿 张干 彭先芝 祁士华 李军

    刘国卿, 张干, 彭先芝, 祁士华, 李军, 2004. 水体中痕量挥发性有机物单体碳同位素组成的固相微萃取-冷阱预富集GC-IRMS分析. 地球科学, 29(2): 235-238.
    引用本文: 刘国卿, 张干, 彭先芝, 祁士华, 李军, 2004. 水体中痕量挥发性有机物单体碳同位素组成的固相微萃取-冷阱预富集GC-IRMS分析. 地球科学, 29(2): 235-238.
    LIU Guo-qing, ZHANG Gan, PENG Xian-zhi, QI Shi-hua, LI Jun, 2004. Determination of Compound-Specific Carbon Isotopic Compositions of Trace-Level Volatile Organic Compounds in Aqueous Phases Using SPME-Cryofocus GC-IRMS Technique. Earth Science, 29(2): 235-238.
    Citation: LIU Guo-qing, ZHANG Gan, PENG Xian-zhi, QI Shi-hua, LI Jun, 2004. Determination of Compound-Specific Carbon Isotopic Compositions of Trace-Level Volatile Organic Compounds in Aqueous Phases Using SPME-Cryofocus GC-IRMS Technique. Earth Science, 29(2): 235-238.

    水体中痕量挥发性有机物单体碳同位素组成的固相微萃取-冷阱预富集GC-IRMS分析

    基金项目: 

    国家重点基础研究“973”项目 G1999045706

    详细信息
      作者简介:

      刘国卿(1977-), 男, 博士研究生, 主要研究方向为环境地球化学.E-mail: lguoqing@gig.ac.cn

    • 中图分类号: P592

    Determination of Compound-Specific Carbon Isotopic Compositions of Trace-Level Volatile Organic Compounds in Aqueous Phases Using SPME-Cryofocus GC-IRMS Technique

    • 摘要: 单体碳同位素分析是进行污染物来源判识与过程示踪的有力工具, 然而有机污染物浓度低、难以萃取富集, 极大地限制了该技术的广泛应用.采用固相微萃取-冷阱富集GC-IRMS技术对水中痕量挥发性有机物进行了单体碳稳定同位素分析, 样品经SPME萃取富集后在色谱进样口冷冻成形, 样品多次进样得以累积从而满足了检测限的要求.本方法检出限较目前文献所报道的SPME方法提高了1个数量级.在优化的条件下, 对低浓度的三氯乙烯、四氯乙烯、苯以及甲苯的水溶液进行了单体碳同位素组成测定, 测定结果与纯液相中的同位素值相比, 同位素分析误差不超过0.5×10-3, 而分析的精度达到±0.3×10-3.固相微萃取-冷阱富集可以提供高效准确的单体碳同位素分析, 该方法适用于水体中痕量挥发性有机污染物的同位素组成测定.

       

    • 图  1  固相微萃取装置

      Fig.  1.  Schematic diagram of SPME apparatus

      图  2  仪器装置

      Fig.  2.  Schematic diagram of apparatus

      图  3  四氯乙烯(◆) 和三氯乙烯(■) (a)、苯(●) 和甲苯(▲) (b) 的平衡时间曲线

      Fig.  3.  Equilibrium time profile for PCE (◆) and TCE (■) (a), benzene (●) and toluene (▲) (b) into SPME fiber

      图  4  不同进样技术碳同位素结果比较

      Fig.  4.  Comparison of δ13C value of different compounds by pure-phase injection, headspace analysis, and h-SPME methods

      表  1  采用固相微萃取技术测定碳同位素与文献结果比较

      Table  1.   Comparison of detection limit for carbon isotope analysis using SPME with references

    • Authur, C., Pawliszyn, J., 1990. Solid-phase microextraction with thermal desorption using fused silica optical fibers. Anal. Chem., 62: 2145-2148. doi: 10.1021/ac00218a019
      Beneteau, K.M., Arave, R., Frape, S.K., 1999. Isotopic characterization of chlorinated solvent-laboratory and field results. Org. Geochem., 30: 739-753. doi: 10.1016/S0146-6380(99)00057-1
      Dias, R.F., Freeman, K.H., 1997. Carbon isotope analysis of semivolatile organic compounds in aqueous media using solid-phase microextraction and isotope ration monitorning GC/MS. Anal. Chem., 69: 944-950. doi: 10.1021/ac960635+
      Harris, S.A., Whiticar, M.J., Eek, M.K., 1999. Molecular and isotopic analysis of oils by solid phase microextraction of gasoline range hydrocarbons. Org. Geochem., 30: 721-737. doi: 10.1016/S0146-6380(99)00056-X
      Huang, L., Sturchio, N.C., Abrajano, T., et al., 1999. Carbon and chlorine isotope fractionation of chlorinated aliphatic hydrocarbons by evaporation. Org. Geochem., 30: 777-785. doi: 10.1016/S0146-6380(99)00060-1
      Hunkeler, D., Aravena, R., 2000. Determination of compound-specific carbon isotope ratios of chlorinated methanes, ethenes, and ethenes in aqueous samples. Environ. Sci. Technol., 34: 2839-2844. doi: 10.1021/es991178s
      Menéndez, J.C.F., Sánchez, M.L.F., Uría, J.E.S., et al., 2000. Static headspace, solid-phase microextraction and headspace solid-phase microextraction for BTEX determination in aqueous samples by gas chromatography. Anal. Chim. Acta, 415: 9-20. doi: 10.1016/S0003-2670(00)00862-X
      Poulson, S.R., Drever, J.I., 1999. Stable isotope(C, Cl and H)fractionation during vaporization of trichloroethylene. Environ. Sci. Technol., 33: 3689-3694. doi: 10.1021/es990406f
      Slater, G.F., Dempster, H.S., Lollar, B.S., et al., 1999. Headspace analysis: A new application for isotopic characterization of dissolved organic contaminants. Environ. Sci. Technol., 33: 190-194. doi: 10.1021/es9803254
      Yang, J., Tsai, S.S., 2001. Development of headspace solid-phase microextraction/attenuated total reflection infrared chemical sensing method for the determination of volatile organic compounds in aqueous solution. Anal. Chim. Acta, 436: 31-40. doi: 10.1016/S0003-2670(01)00890-X
      Zhang, Z., Yang, M., Pawliszyn, J., 1994. Solid-phase microextraction. Anal. Chem., 66: 844-853.
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    出版历程
    • 收稿日期:  2003-07-25
    • 刊出日期:  2004-03-25

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