气相色谱-质谱法测定水体中三氟乙酸项
GC-MS Determination of Trifluoro-Acetic Acid in Water Sample
摘 要
用多级浓缩的预处理富集水中微量的三氟乙酸,再将富集的三氟乙酸通过甲酯衍生化生成适合顶空进样的三氟乙酸甲酯,以气相色谱-质谱法对水体中三氟乙酸进行测定.试验对顶空进样的条件进行了优化,采用全扫描模式进行定性分析,选择离子扫描模式,以质荷比59,69的特征离子进行定量检测.检出限(3s)为1 μg·L-1,对空白溶液进行加标回收试验,回收率在64.3%~68.1%之间,相对标准偏差(n=6)在5.62%~5.78%之间.
三氟乙酸
多级浓缩
GC-MS
Trifluoro-acetic acid
Multistage concentration
Abstract
Traces of trifluoro-acetic acid (TFA) in water sample were enriched by multistage concentration,and TFA obtained was derivatized with methanol to form methyl trifluoro-acetate (MTFA) which is suitable for head-space sample introduction in the GC-MS determination of TFA in water.The condition of head-space sample introduction was optimized.The full-scanning mode was used for qualitative analysis,and selected ion monitoring (SIM) was used for quantitative analysis with ions having m/z 59 and 69 as characteristic ions.The detection limit (3s) of the method was 1 μg·L-1.Test for recovery obtained was made by adding standard solution to blank solution,and the values of recovery obtained were in the range of 64.3%-68.1%,the values of RSD′s (n=6) were in the range of 5.62%-5.78%.
中图分类号 O657.63
所属栏目 工作简报
基金项目 江苏省环境监测基金项目(0703)
收稿日期 2008/12/7
修改稿日期
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备注项徐伟(1983-),男,江苏南通人,助理工程师,主要研究方向为环境方法研究和环境模型的建立.
引用该论文: XIANG Xu-wei,SHEN Zhi-qun,ZHENG Gang,WU Peng. GC-MS Determination of Trifluoro-Acetic Acid in Water Sample[J]. Physical Testing and Chemical Analysis part B:Chemical Analysis, 2010, 46(3): 241～243
徐伟,沈志群,郑刚,吴鹏. 气相色谱-质谱法测定水体中三氟乙酸项[J]. 理化检验－化学分册, 2010, 46(3): 241～243
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参考文献
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【2】TROMP T K.Potential accumulation of a CFC replacement degradation product in seasonal wetlands[J].Nature,1995,376:327-330．
【3】WALLINGTON T J,HURLEY M D,FRACHEBOUD J M,et al.Role of excited CF3CFHO radicals in the atmospheric chemistry of HFC2134a[J].J Phy Chem,1996,100:18116-18122．
【4】TROMP T K.Formation of trifluoroacetic acid from the atmospheric degra-dation of hydroflurocarbon 134a: a human health concern[J].Air & Water,1993,43:1260-1262．
【5】RICHEY D G,DRISCO C T,LIKENS G E.Soil retention of trifluoroacetate[J].Environmental Science & Technology,1997,13(6):1723-1727．
【6】WALLINGTON T J,SCHNEIDER W F,WORSNOP D R,et al.The environmental impact of CFC replacements 2HFCs and HCFCs[J].Environ Sci Technol,1994,28:320A-326A．
【7】NIELSEN O J,SCOTT B F,SPENCER C,et al.Trifluoroaceticacid in ancient freshwater[J].Atmos Environ,2001,35:2799-2801．
【8】曾铮,张剑波,胡建信,等.北京地表水中三氟乙酸的测定[J].环境科学研究,2004,17(5):64-67．
【9】项徐伟.气相色谱酯化反应的最佳条件[J].污染防治技术,2006,5:64-65．
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