【摘要】：基于金汞齊-冷原子熒光法開發了一套小型氣態元素汞(TGM)在線監測儀,該儀器采用真空系統設計,體積小、重量輕,可實現無人值守自動運行,適用于車載移動觀測.實驗測試表明,儀器在典型時間分辨率4 min條件下的檢出限能達到0.2 ng·m~(-3),優于商品化大氣汞分析儀;且具有較高的精密度,標氣重復實驗相對偏差2%,工作曲線擬合優度R~20.999.將該儀器搭載于機動車內,對北京市四、五環路沿線氣態元素汞進行了移動監測,測得四環路與五環路TGM平均濃度分別為2.25、2.63 ng·m~(-3).該儀器可提供高時空分辨率的大氣汞濃度數據,可為氣態元素汞的監測和污染控制提供技術支持.
[Abstract]:Based on the method of gold amalgam and cold atomic fluorescence, a small on-line monitoring instrument for gas elemental mercury (TGM) is developed. The instrument is designed by vacuum system, which is small in volume and light in weight. It can be operated automatically and unattended. It is suitable for vehicle-mounted mobile observation. The experimental results show that the detection limit of the instrument is 0.2 ng m ~ (-3) at a typical time resolution of 4 min, which is superior to that of commercial atmospheric mercury analyzer. It also has high precision, relative deviation of standard gas repeated experiment 2 and excellent fitting degree of working curve RV 20.999. In this paper, the gas elemental mercury along the fourth and Fifth Ring Road in Beijing was monitored by this instrument. The average concentration of TGM in the fourth Ring Road and the Fifth Ring Road was 2.25 ~ 2.63 ng m ~ (-3), respectively. The instrument can provide atmospheric mercury concentration data with high spatial and temporal resolution and provide technical support for monitoring and pollution control of gaseous elemental mercury.
【作者單位】： 環境模擬與污染控制國家重點聯合實驗室北京大學環境科學與工程學院;
【基金】：國家高技術研究發展計劃(No.2014AA06A507)~~
【分類號】：X851

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