Heterogeneous uptake of NO2 on soils under variable temperature and relative humidity conditions.
Heterogeneous uptake of NO2 on soils under variable temperature and relative humidity conditions.
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DOI：
10.1016/s1001-0742(11)61015-2
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发表时间：
2012-10
影响因子：
6.9
通讯作者：
Lei Wang;Weigang Wang;Maofa Ge
中科院分区：
文献类型：
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作者：
Lei Wang;Weigang Wang;Maofa Ge
在相对湿度(RH)为5%~80%、温度为278~328K的条件下，采用水平涂层壁流管法研究了二氧化氮(NO2)在大连(S1)和长沙(S2)土壤上的非均相反应。当相对湿度从5%增加到80%时，NO2在S2上的初始吸收系数从(10±1.3)×10−8下降到(3.1±0.5)×10−8。在温度效应研究中，当温度从2 78 K升高到2 88 K时，S1和S2的初始吸收系数分别从(10±1.2)×10−8降到(3.8±0.5)×10−8和从(16±2.2)×10−8降到(3.8±0.4)×10−8。在313K和328K时，随着温度的升高，S1和S2的初始吸收系数分别恢复到(7 9±1 1)×10−8和(2 0±3 1)×10−8。研究表明，相对湿度影响土壤对NO2的吸收动力学，温度影响NO2的非均相化学。
Heterogeneous reactions of nitrogen dioxide (NO2) on soils collected from Dalian (S1) and Changsha (S2) were investigated over the relative humidity (RH) range of 5%–80% and temperature range of 278–328 K using a horizontal coated-wall flow tube. The initial uptake coefficients of NO2on S2 exhibited a decreasing trend from (10 ± 1.3) × 10−8to (3.1 ± 0.5) × 10−8with the relative humidity increasing from 5% to 80%. In the temperature effect studies, the initial uptake coefficients of S1 and S2 decreased from (10 ± 1.2) × 10−8to (3.8 ± 0.5) × 10−8and from (16 ± 2.2) × 10−8to (3.8 ± 0.4) × 10−8when temperature increased from 278 to 288 K for S1 and from 278 to 308 K for S2, respectively. As the temperature continued to increase, the initial uptake coefficients of S1 and S2 returned to (7.9 ± 1.1) × 10−8and (20 ± 3.1) × 10−8at 313 and 328 K, respectively. This study shows that relative humidity could influence the uptake kinetics of NO2on soil and temperature would impact the heterogeneous chemistry of NO2.