A new technique for the selective measurement of atmospheric peroxy radical concentrations of HO2 and RO2 using a denuding method
A new technique for the selective measurement of atmospheric peroxy radical concentrations of HO2 and RO2 using a denuding method
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DOI：
10.5194/amt-3-1547-2010
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发表时间：
2010-01-01
影响因子：
3.8
通讯作者：
Kajii, Y.
中科院分区：
文献类型：
--
作者：
Miyazaki, K.;Parker, A. E.;Kajii, Y.
介绍了一种利用过氧自由基化学放大耦合激光诱导荧光NO2检测技术（PERCA-LIF）对大气中的HO 2和RO 2进行选择性测量的方法。通过将空气拉过填充的预入口，可以利用相对于CH 3 O2的HO 2的更高的非均相损失率。预进气条件已被发现，其中ca。90%的HO 2被去除，而可比较的CH 3 O2损失为15%。研究了损失率与湿度和过氧自由基浓度的关系。当使用玻璃微珠作为去除过氧自由基的表面时，相对湿度对去除效率的影响变得可以忽略。因此，可以将该技术应用于测量单独的RO 2以及HO 2和RO 2的总和的绝对浓度。PERCA-LIF耦合到扩散管的实际效用已经通过大气测量得到证明。
A technique for the selective measurement of atmospheric HO2 and RO2 using peroxy radical chemical amplification coupled to laser-induced fluorescence NO2 detection (PERCA-LIF) is demonstrated. By pulling the air through a filled pre-inlet advantage can be taken of the higher heterogeneous loss rate of HO2 relative to CH3O2. Pre-inlet conditions have been found where ca. 90% of HO2 was removed whereas the comparable CH3O2 loss was 15%. The dependence of loss rate on humidity and peroxy radical concentration has been investigated. When using glass beads as the surface for peroxy radical removal, the influence of the relative humidity on the removal efficiency becomes negligible. It may therefore be possible to apply this technique to the measurement of absolute concentrations of solely RO2 as well as the sum of HO2 and RO2. The practical utility of the PERCA-LIF coupled to a denuder has been demonstrated with atmospheric measurements.