【摘要】 通过低温脱水和低温浓缩（－１９６℃），建立了用气相色谱（ＥＣＤ检测器）测定大气中超痕量氯氟烃类物质（ＣＥＣｓ）的分析方法．对上海市清洁大气中ＣＦＣｓ本底浓度进行了监测，并与日本东京大学的数据进行了比较．结果表明，１９９７年以来，上海市郊大气中ＣＦＣ－１１和ＣＦＣ－１２浓度均呈下降趋势．上海ＣＦＣｓ排放量与发达国家相比仍处于较低的水平．更多还原

【Abstract】 The method of detecting atmospheric CFCs using gas chromatograph(ECD detector) was established.Through the procedure,the method of cryogenic dehydration and concentrating was introduced.The CFCs concentration of Shanghai clean air was detected and was compared with that of The University of Tokyo,Japan.The result shows that,since 1997,the atmospheric concentrations of CFC 11 and CFC 12 have decreased.Shanghais emission of CFCs is in a low level compared with the developed countries.更多还原