摘要
结合石油类污染场地风险评估和精准管控的需要,针对甘肃某地区污染场地,开展挥发性有机物(VOCs)挥发行为影响因素研究。以场地特征污染物苯系物(BTEXs)进行挥发模拟实验,得到不同温度、降雨量、光照及风速下苯、乙苯和间,对二甲苯挥发趋势以及挥发通量的变化情况。结果表明,相同条件下,土壤中BTEX挥发通量大小依次为:苯>乙苯>间,对二甲苯;温度对BTEXs在土壤中的挥发速率影响显著,但对总挥发量无显著影响,温度越高,初始时间内的挥发通量就越大,随着时间变化,通量逐渐变小;BTEX在土壤中的挥发与降雨量呈负相关,降雨量增加会使土壤中BTEXs的浓度及挥发通量减少,在测定的时间内,挥发通量趋势无明显变化;风速在1~3 m!3/h范围内,土壤中苯的挥发通量随着空气流速增大而增大;苯系物易在环境空气中发生光化学反应,光照作用下加速苯系物挥发。
Combined with the need of risk assessment and accurate control of petroleum contaminated sites,the study on factors affecting volatile organic compounds(VOCs)volatilization behavior was carried out in a contaminated site in Gansu Province.The volatilization of benzene series(BTEXs)was simulated,and the volatile trends and volatile fluxes of benzene,ethylbenzene and M-p-xylene were obtained under different temperature,rainfall,light and wind speed.The results showed that under the same conditions,the volatile flux of BTEX in soil was:benzene>ethylbenzene>M-xylene.The temperature had a significant effect on the volatile rate of BTEXs in soil,but has no significant effect on the total volatile amount.The higher the temperature,the greater the volatile flux in the initial time,and the flux decreases gradually with the change of time.The volatile of BTEX in soil was negatively correlated with rainfall.The increase of rainfall would reduce the concentration and volatile flux of BTEXs in soil,and there was no significant change in the trend of volatile flux during the measured time.In the range of 1~3 m³/h,the volatile flux of benzene in soil increased with the increase of air velocity.Benzene series was easy to undergo photochemical reaction in ambient air,and the volatile of benzene series was accelerated under the action of light.
作者
王浩
王月
WANG Hao;WANG Yue(School of Chemistry and Chemical Engineering,Northeast Petroleum University,Daqing 163318,China;Environmental Pollution Control Engineering Technology Research Center of the Chinese Academy of Environmental Sciences,Beijing 100012,China)
出处
《环境保护科学》
2025年第1期107-117,共11页
Environmental Protection Science
基金
国家重点研发计划项目(2020YFC1807103)。
关键词
VOCS
挥发特征
挥发通量
影响因素
VOCs
volatile characteristics
volatile flux
influence factor
