發(fā)布時(shí)間：2018-12-09 18:06

【摘要】：基于金汞齊-冷原子熒光法開(kāi)發(fā)了一套小型氣態(tài)元素汞(TGM)在線監(jiān)測(cè)儀,該儀器采用真空系統(tǒng)設(shè)計(jì),體積小、重量輕,可實(shí)現(xiàn)無(wú)人值守自動(dòng)運(yùn)行,適用于車(chē)載移動(dòng)觀測(cè).實(shí)驗(yàn)測(cè)試表明,儀器在典型時(shí)間分辨率4 min條件下的檢出限能達(dá)到0.2 ng·m~(-3),優(yōu)于商品化大氣汞分析儀;且具有較高的精密度,標(biāo)氣重復(fù)實(shí)驗(yàn)相對(duì)偏差2%,工作曲線擬合優(yōu)度R~20.999.將該儀器搭載于機(jī)動(dòng)車(chē)內(nèi),對(duì)北京市四、五環(huán)路沿線氣態(tài)元素汞進(jìn)行了移動(dòng)監(jiān)測(cè),測(cè)得四環(huán)路與五環(huán)路TGM平均濃度分別為2.25、2.63 ng·m~(-3).該儀器可提供高時(shí)空分辨率的大氣汞濃度數(shù)據(jù),可為氣態(tài)元素汞的監(jiān)測(cè)和污染控制提供技術(shù)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(huán)境模擬與污染控制國(guó)家重點(diǎn)聯(lián)合實(shí)驗(yàn)室北京大學(xué)環(huán)境科學(xué)與工程學(xué)院;
【基金】：國(guó)家高技術(shù)研究發(fā)展計(jì)劃(No.2014AA06A507)~~
【分類(lèi)號(hào)】：X851

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