| 填埋场作业面NMOCs臭氧生成潜势及高贡献物质 |
| 摘要点击 2766 全文点击 1130 投稿时间：2018-02-08 修订日期：2018-03-14 |
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| 中文关键词 填埋场 作业面 非甲烷有机物(NMOCs) 臭氧生成潜势 高贡献物质 |
| 英文关键词 landfill working face non-methane organic compounds(NMOCs) ozone formation potential highly contributing substances |
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| 中文摘要 |
| 非甲烷有机物（NMOCs）是大气光化学反应生成臭氧过程的主要前体物，填埋场作业面是其重要无组织释放源.为控制对流层臭氧污染，必须控制NMOCs浓度，而识别高臭氧生成贡献物质是前提.本研究采集填埋场作业面气体样品，分析其组分特征，并以等效丙烯浓度法和最大增量反应活性法计算其臭氧生成潜势.结果表明，填埋场作业面共检出符合检出频率与浓度条件的36种5大类物质，NMOCs年均总浓度约为10000 μg·m-3，夏季总浓度最高，各类物质浓度呈含氧化合物 > 含硫化合物 > 卤代烃 > 苯系物 > 碳氢化合物的规律；综合两种计算方法结果，全年范围内高臭氧生成贡献物质为乙醇、间二甲苯、丙烯、乙酸乙酯和正戊烷；春季与全年类似，夏秋两季高贡献物质为乙醇、1-丁烯、甲苯、环己烷和苯乙烯，冬季乙醇贡献极高.通过比较，等效丙烯浓度法更适合估算作业面臭氧生成潜势. |
| 英文摘要 |
| Non-methane organic compounds (NMOCs) are major ozone precursors in atmospheric photochemical reactions. The working face of a landfill is a significant source of fugitive NMOC emissions. In order to control tropospheric ozone pollution, it is necessary to minimize NMOCs, and this requires identification of contributing substances. In this study, gas samples were collected from the working face of a landfill and analyzed. Their ozone formation potential was calculated using the propylene-equivalent concentration method and the maximum incremental reactivity method. In total, 36 kinds of substances met the standard for detection frequency and concentration. The average annual concentration of NMOCs was about 10000 μg·m-3, with total concentration greatest in summer. Concentrations of materials were as follows:oxygenated compounds > sulfur compounds > halogenated hydrocarbons > benzene series > hydrocarbons. Based on the results of the two calculation methods, ethanol, m-xylene, propylene, ethyl acetate, and n-pentane were found to be significant ozone formation contributors across the whole year. The pattern for spring was similar. Contributors to high ozone formation were ethanol, 1-butene, toluene, cyclohexane, and styrene in summer and spring, while ethanol contributed very significantly in winter. The propylene-equivalent concentration method was found to be more suitable for estimating ozone formation potential from the working face. |
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