色谱

色谱 ›› 2011, Vol. 29 ›› Issue (01): 70-74.DOI: 10.3724/SP.J.1123.2011.00070

• 研究论文 • 上一篇    下一篇

二维气相色谱法分析天然气水合物区沉积物间隙水中示踪气体的浓度

王虎1,2,3*, 杨群慧2, 季福武2, 周怀阳2, 薛翔4   

  1. 1. 中国科学院广州地球化学研究所, 广东 广州 510640; 2. 同济大学海洋地质国家重点实验室, 上海 200092; 3. 中国科学院研究生院, 北京 100049; 4. 中国科学院深圳先进技术研究所, 广东 深圳 518055
  • 收稿日期:2010-09-30 修回日期:2010-12-08 出版日期:2011-01-28 发布日期:2011-01-28
  • 通讯作者: 王虎,讲师,主要研究方向为海洋分析化学. Tel: (021)65987615, E-mail: wanghu@tongji.edu.cn.
  • 基金资助:

    国家高技术研究发展计划(“863”计划)(Nos. 2007AA091902, 2007AA09Z208).

Determination of tracer gas contents in sediment pore water of gas hydrate area by two-dimensional gas chromatography

WANG Hu1,2,3*, YANG Qunhui2, JI Fuwu2, ZHOU Huaiyang2, XUE Xiang4   

  1. 1. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; 2. State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China; 3. Graduate University of Chinese Academy of Sciences, Beijing 100049, China; 4. Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China
  • Received:2010-09-30 Revised:2010-12-08 Online:2011-01-28 Published:2011-01-28
  • Contact: Hu Wang

PDF

626

摘要： 利用微流路控制技术中心切割装置(Deans Switch)、两根色谱柱(PoraPLOT Q和Molsieve 5A)和3个检测器(脉冲氦离子化检测器、火焰光度检测器、热导检测器),建立了一种二维气相色谱分析系统,实现了海洋中多种示踪气体组分(氢气、甲烷、二氧化碳、硫化氢)的同时分析和精确测定。氢气、甲烷、二氧化碳、硫化氢的含量分别在2～1030、0.6～501、120～10500和0.2～49.1 μmol/mol范围内的校正曲线线性关系良好,检出限分别为0.51、0.17、82和0.08 μmol/mol,10次重复测定含量的相对标准偏差均小于10%。通过对南海天然气水合物区沉积物间隙水顶空气的测定,表明该方法方便、灵敏、可靠,易于实现海上现场测定;与以往采用多种分析方法分别测定示踪气体相比,大大节省了样品量。该方法适用于海洋天然气水合物、海底热液等资源的调查和海洋溶解态气体的研究等。

关键词: 二维气相色谱法, 二氧化碳, 甲烷, 硫化氢, 氢气, 天然气水合物

Abstract: A two-dimensional gas chromatographic instrument was established by the capillary flow technology (Deans Switch) and two columns (PoraPLOT Q and Molsieve 5A) and three detectors (pulsed discharge helium ionization detector, flame photometric detector and thermal conductivity detector). The instrument can be used to measure tracer gases simultaneously including hydrogen, methane, carbon dioxide and hydrogen sulfide. The detection limits of the hydrogen, methane, carbon dioxide and hydrogen sulfide were 0.51, 0.17, 82 and 0.08 μmol/mol, and the calibration curves presented good linear relationships in the range of 2~1030, 0.6~501, 120~10500 and 0.2~49.1 μmol/mol, respectively. The relative standard deviations were less than 10% for the measurements of ten standard gases. By this method, the tracer gases in the sediment pore water of gas hydrate area in South China Sea had been detected. This method is simple, sensitive, and suitable for on-board detection. Compared with the usual methods for measuring tracer gases, the amount of a sample necessary is reduced greatly. It is useful for the survey of gas hydrate and hydrothermal resources below sea floor and for the research of dissolved gases in the ocean.

Key words: carbon dioxide, gas hydrate, hydrogen, hydrogen sulfide, methane, two-dimensional gas chromatography (2D-GC)