A New Gas-Chromatograghic Method of Organic Elemental Analysis

가스크로마토그래피에 依한 微量元素分析

  • Kim, You-Sun (Atomic Energy Research Institute) ;
  • Son, Youn-Soo (Department of Chemistry, Seoul National University) ;
  • Choi, Q.Won (Department of Chemistry, Seoul National University)
  • 김유선 (원자력 연구소) ;
  • 손연수 (서울대학교 문리과대학 화학과) ;
  • 최규원 (서울대학교 문리과대학 화학과)
  • Published : 19641200


A new gas-chromatographic method for determining carbon and hydrogen in organic compounds has been developed. After sample combustion was performed in a regular analytical combustion tube with an internal oxidant (a mixture of silver oxide and manganese dioxide) under a helium flow, the water produced was converted to acetylene by passing through a calcium carbide tube. The carbon dioxide and acetylene were trapped by a molecular sieve 5A column at room temperature. The trapped gases were released under programmed temperature raise up to $340^{\circ}C$ and the released gases were passed through a silica gel column. The adsorption of $CO_2$ and $C_2H_2$ in the molecular sieve 5A trapping column were found to be quantitative and the silica gel column showed an excellent resolution of $CO_2$ and $C_2H_2$ for analytical purpose. The analytical results for various known compounds based on the out-put of the thermal conductivity cell calibrated for the amounts of carbon and hydrogen contents in benzoic acid, showed average errors ${\pm}0.5%$ and ${\pm}0.33%$ for carbon and hydrogen, respectively.



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