气相色谱法检测本底大气N2O的单一标气定量方法  

SINGLE STANDARD CALIBRATION METHOD BY GC-ECD SYSTEM ON THE BACKGROUND N_2O MEASUREMENT

作　　者：方双喜[1] 周凌晞[1] 汪巍[1] 张芳[1] 姚波[1] 许林[1] 刘立新[1] 温民[1] 

机构地区：[1]中国气象科学研究院,中国气象局大气成分观测与服务中心,北京100081

出　　处：《环境化学》2011年第5期1030-1033,共4页Environmental Chemistry

基　　金：公益性行业科研专项(GYHY200806026);国家973项目(2010CB950600);国家自然科学基金(40775078)资助

摘　　要：提出采用单一标气非线性校正的方式对未知气体的N2O进行定量.以浓度为278.11×10-9(物质的量之比)的单一标气多次分析3瓶接近于环境浓度的N2O样气,结果与多点二次多项式拟合均值差异小于0.1×10-9,精度优于(0.03±0.09)%,表明该方法在用于本底大气中N2O浓度在线观测时,能有效校正采用单点线性拟合可能引起的定值偏差.该方法还能减少工作标气使用数量及分析频率,提高大气样品分析效率.In this study,non-linearity correction based on linear regression was applied to the N2O measurement in air sample.Three ambient N2O samples were calibrated several times against 278.11×10-9 standard by this method.Average difference to that of the polynomial fitting results was less than 0.1 ×10-9 and precision was better than（0.03±0.09）%,proving proved that the method could roughly correct error from the linear regression.Additionally,the method could reduce the number of working standards and their frequency of injection.It can also obviously increase measurement efficiency of ambient air.

关 键 词：电子捕获检测器 N2O 非线性校正 定量 

分 类 号：X831[环境科学与工程—环境工程]