北京大学学报(自然科学版)

两次相平衡/液上气相色谱法测定水中挥发性苯系物

王永华1, 陶澍1, 张军华2, 李新云2, 时杰2, 王新成2, 赵秋华2, 时廷秀2   

  1. 1北京大学城市与环境学系,北京,100871; 2山东省潍坊市环境监测中心站, 潍坊, 261040
  • 收稿日期:1996-04-16 出版日期:1996-11-20 发布日期:1996-11-20

Determination of Volatile Benzenes in Water by Twice Phase Equilibration/GC

WANG Yonghua1, TAO Shu1, ZHANG Junhua2, LI Xinyun2, SHI Jie2, WANG Xincheng2, ZHAO Qiuhua2, SHI Tingxiu2   

  1. 1Department of Urban and Environment Peking University, Beijing, 100871; 2Weifang Center Station of Enviromental Monitoring, Shandong, Weifang, 261041
  • Received:1996-04-16 Online:1996-11-20 Published:1996-11-20

摘要: 选择7种水中挥发性苯系物作为研究对象,提出了两次相平衡/液上气相色谱法测定水中挥发性有机物的方法。推导了气液等体积平衡,只分析气相就可测定水相浓度的理论关系式,研制了可变相平衡器。实测水中7种挥发性苯系物的回收率在88%~120%之间,相对标准偏差和相对误差小于20%,检出限范围在2~3μg/L。方法可以满足环境监测的要求。

关键词: 水分析, 挥发性苯系物, 液上气相色谱, 两次相平衡

Abstract: The article presents the method of determination of volatile benzenes in water with twice phase equilibration/Headspace GC.Analysis of only gas phase after two succesive phase equilibrations gives concentration of volatile benzenes in water and their Henry law constants. The relative standard deviation of the method is better than 20% for seven volatile benzenes. The limit of detection is the range of 2~3 μg/L. The recovery of the method is quantitative.

Key words: twice phase equilibration, volatile benzenes, water analysis, gas chromatograph

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