研究报告
潘京京,方双喜,王红阳,梁苗,孙万启,许丽娜.气相色谱法对本底大气氧化亚氮浓度的标气定量方法研究[J].环境科学学报,2018,38(5):1768-1773
气相色谱法对本底大气氧化亚氮浓度的标气定量方法研究
- Research on the working standards calibration method for measuring atmospheric nitrous oxide concentration
- 基金项目：国家重点研发计划项目（No.2017YFC0209700）；国家自然科学基金（No.41405129，41375130）
- 作者
- 单位
- 潘京京
- 中国气象局气象探测中心, 中国气象局大气成分观测与服务中心, 北京 100081
- 方双喜
- 中国气象局气象探测中心, 中国气象局大气成分观测与服务中心, 北京 100081
- 王红阳
- 中国气象局气象探测中心, 中国气象局大气成分观测与服务中心, 北京 100081
- 梁苗
- 中国气象局气象探测中心, 中国气象局大气成分观测与服务中心, 北京 100081
- 孙万启
- 中国气象局气象探测中心, 中国气象局大气成分观测与服务中心, 北京 100081
- 许丽娜
- 中国气象局气象探测中心, 中国气象局大气成分观测与服务中心, 北京 100081
- 摘要：利用气相色谱-电子捕获检测器法（GC-ECD）测量大气中氧化亚氮（N2O）浓度是目前广泛使用的方法，但ECD分析N2O时存在线性范围较窄的缺点，因此，标气数量和定量方式是决定分析结果的关键因素.基于此，本文对比分析了单点线性校正法（S）、多点线性拟合法（D）、单瓶标气近似校正法（SA）、单瓶标气比值校正法（SC）对N2O检测分析结果的差异.结果表明，SA定量相对误差最小，对测试使用的6瓶标气定值平均误差为0.09×10-9.根据本底大气N2O观测精度要求，以及我国大气N2O浓度变化范围较大的特征，推荐选用SA法对大气中N2O浓度进行定值.依据所选方法对黑龙江龙凤山本底站大气N2O浓度进行观测（2015年1—12月），结果显示，黑龙江龙凤山站大气N2O浓度最高值出现在4—5月，平均值超过330×10-9.该站大气N2O浓度主要受人为活动排放的影响.
- Abstract：Gas Chromatography-Electron Capture Detector (GC-ECD) is a widely used method for measuring atmospheric nitrous oxide (N2O). As ECD detector has a very narrow linearity response range, the number and calibration method of the standard gases are the key factors for determining the N2O mole fractions. In this study, four commonly used N2O calibration methods were compared on the calibration results, which were single-point calibration with linear regression (S), multi-point calibration with linear regression (D), single standards with offset compensation (SA), and single standards with curve ratio correction (SC). The results indicate that, the relative errors of SA was the smallest among the four methods, with the average bias of 0.09×10-9 for the 6 testing standards. Considering the precision need and the large variation of atmospheric N2O in China, the SA was strongly recommended to be adopted. By using the SA method, atmospheric N2O was continuous measured at the Longfengshan background station during 2015. The results showed that the peak N2O values were observed from April to May, with the average mole fractions exceeding 330×10-9. The atmospheric N2O concentrations at Longfengshan were mainly influenced by emissions from agricultural field in summer-autumn period, whereas were influenced by anthropogenic emissions during winter-spring period.
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