KINETICS OF THE GAS-PHASE REACTIONS OF OH AND NO3 RADICALS WITH 2-CARENE, 1,8-CINEOLE, PARA-CYMENE, AND TERPINOLENE
KINETICS OF THE GAS-PHASE REACTIONS OF OH AND NO3 RADICALS WITH 2-CARENE, 1,8-CINEOLE, PARA-CYMENE, AND TERPINOLENE
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DOI：
10.1021/es00080a007
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发表时间：
1990-10-01
影响因子：
11.4
通讯作者：
ATKINSON, R
中科院分区：
文献类型：
--
作者：
CORCHNOY, SB;ATKINSON, R
OH和NO3自由基与生物源释放的单萜2-<$烯和萜品油烯以及相关化合物1，8-桉叶素和对伞花烃的气相反应的速率常数已在295 ±-。2K和大气压下的相对速率法。所获得的速率常数为（cm 3分子-1s-1）如下。对于与OH自由基的反应：2-$>烯，7.95 ×10-11; 1，8-桉叶油素，1.11 ×. 10-11;对伞花烃，1.51 ×. 10-11;萜品油烯，2.25 ×10-10.对于与NO3自由基的反应：2-$>烯，1.94 ×10-11; 1，8-桉叶油素，1.7 ×. 10-16;对伞花烃，9.9 ×. 10-16;萜品油烯，9.62 ×. 10-11.结合这些化合物与O_3反应的速率数据以及大气对流层中OH、NO_3自由基和O_3的浓度，这些数据表明，OH、NO_3自由基和O_3反应对于2-<$烯和萜品油烯都必须考虑为损失过程，计算的2-<$烯和萜品油烯的寿命为2 h或更短。只有OH自由基反应是重要的，计算出1，8-桉叶素和对伞花烃的对流层寿命为1.0-1.4天。
Rate constants for the gas-phase reactions of OH and NO3 radicals with the biogenically emitted monoterpenes 2-carene and terpinolene and the related compounds 1,8-cineole and p-cymene have been determined at 295 .+-. 2 K and atmospheric pressure by using relative rate methods. The rate constants obtained were (cm3 molecule-1 s-1) as follows. For reaction with the OH radical: 2-carene, 7.95 .times. 10-11; 1,8-cineole, 1.11 .times. 10-11; p-cymene, 1.51 .times. 10-11; terpinolene, 2.25 .times. 10-10. For reaction with the NO3 radical: 2-carene, 1.94 .times. 10-11; 1,8-cineole, 1.7 .times. 10-16; p-cymene, 9.9 .times. 10-16; terpinolene, 9.62 .times. 10-11. Combined with the rate data for the corresponding reactions of these compounds with O3 and the ambient tropospheric concentrations of OH and NO3 radicals and O3, these data show that the OH and NO3 radical and O3 reactions must all be considered as loss processes for 2-carene and terpinolene, with calculated lifetimes of 2-carene and terpinolene of 2 h or less. For 1,8-cineole and p-cymene, only the OH radical reactions will of importance, with tropospheric lifetimes of 1,8-cineole and p-cymene of 1.0-1.4 days being calculated.