吹扫-捕集气相色谱法测定海水中挥发性卤代烃  

Determination of Volatile Halocarbons in Seawater Using Purge-and-Trap Gas Chromatography

作　　者：杨桂朋[1] 尹士序[1] 陆小兰[1] 宋贵生[1] 

机构地区：[1]中国海洋大学海洋化学理论与工程技术教育部重点实验室,山东青岛266003

出　　处：《中国海洋大学学报（自然科学版）》2007年第2期299-304,共6页Periodical of Ocean University of China

基　　金：国家杰出青年科学基金(40525017);山东省自然科学基金重点项目(Z2005E01);山东省"泰山学者"建设工程专项经费(JS200510016)资助

摘　　要：挥发性卤代烃（VHC）是大气中的痕量气体，对臭氧层损耗和温室效应有重要作用。海洋是大气中VHC的主要自然排放源，开展海洋VHC的研究有助于了解海洋对大气VHC和全球变暖的贡献。本文建立了吹扫-捕集与气相色谱-微池电子捕获检测器联用技术（P—T—GC（ECD）分析海水中6种VHC的方法，确定了吹扫-捕集条件和气相色谱分离条件。该方法的检测限在0．003～0．369ng·L^-1之间；相对标准偏差是1．83～3．97；加标回收率为98．1％～110．2％；相关系数在0．9973-0．9998之间。可准确地测定海水中6种VHC。Volatile halocarbons （VHCs） are important atmospheric trace gases, which play significant roles in stratospheric ozone depletion and in the greenhouse effect. The ocean is a natural source of atmospheric VHCs. The studies of VHCs in the ocean are helpful to understanding the contribution of the ocean to atmospheric VHCs and global warming. A cryogenic purge and trap technique combined with gas chromatographic separation and electron capture detection was developed for the analysis of 6 kinds of VHCs in seawater in this paper. The optimum conditions for the purge-trap and chromatographic analysis of VHCs were confirmed. Detection limits of 0. 003 - 0. 369 ng· L^- 1, RSD percentages of 1.83 % - 3.97 %, spiking recoveries of 98.1%- 110.2 %, and coefficient correlations of 0. 997 3 -0. 999 8 were obtained.

关 键 词：海水 挥发性卤代烃 分析方法 吹扫-捕集法 

分 类 号：P734.43[天文地球—海洋化学] O657.71[天文地球—海洋科学]