环境氨气被动采样法的适用性研究及在城市观测中的应用  

Study on the Applicability of Passive Sampling Method for Ambient Ammonia and Its Application in Urban Observation

作　　者：韩文叶 周敏 冯馨蔚 梁波[1] 乔利平 常运华 黄丹丹 朱书慧 杨帆 关杰[1] 黄成 HAN Wenye;ZHOU Min;FENG Xinwei;LIANG Bo;QIAO Liping;CHANG Yunhua;HUANG Dandan;ZHU Shuhui;YANG Fan;GUAN Jie;HUANG Cheng(School of Resources and Environmental Engineering,Shanghai Polytechnic University,Shanghai 201209,China;State Environmental Protection Key Laboratory of the Cause and Prevention of Urban Air Pollution Complex,Shanghai Academy of Environmental Sciences,Shanghai 200233,China;Yale-NUIST Center on Atmospheric Environment,International Joint Laboratory on Climate and Environment Change(ILCEC),School of Applied Meteorology,Nanjing University of Information Science&Technology,Nanjing 210044,China;Environmental Monitoring Station of Pudong New District,Shanghai 200135,China)

机构地区：[1]上海第二工业大学资源与环境工程学院,上海201209 [2]上海市环境科学研究院,国家环境保护城市大气复合污染成因与防治重点实验室,上海200233 [3]南京信息工程大学应用气象学院,耶鲁大学-南京信息工程大学大气环境中心,江苏南京210044 [4]上海市浦东新区环境监测站,上海200135

出　　处：《中国环境监测》2024年第6期173-184,共12页Environmental Monitoring in China

摘　　要：以环境NH_(3)为观测对象,对ALPHA被动采样法的采样吸附膜制备、样品保存和采样时间开展适用性研究,并与主动采样方法进行了对比验证,在此基础上进一步在上海市不同功能区开展了实地观测应用研究。结果显示:酸浸渍法制备的吸附膜NH+4含量均值为(0.27±0.13)μg,比未处理吸附膜的NH+4含量高约8%,且可在膜液比(张/mL)为1:4~8:4范围内增加膜的单次浸渍数量以降低制备过程中的溶剂使用量,酸浸渍法的制备流程及不同膜液比处理方式对空白吸附膜的NH+4含量影响不大。当采样温度为20℃,采样时长为168 h时,该被动法测定环境NH_(3)的方法检出限为0.08μg/m^(3)。密实袋双层密封、4℃冷藏、保存时间小于30 d的保存方式未显著增加空白膜的NH+4含量,适用于空白吸附膜和样品膜的保存。采样时间适用性验证结果表明:城市地区使用ALPHA被动采样法测定环境NH_(3)时,采样时间不少于6 d且至少在30 d内进行连续采样。使用ALPHA被动采样法与主动采样方法观测NH_(3)浓度时,观测结果变化趋势较一致,测量结果吻合良好(相关系数为0.87,斜率为1.16),进一步证明了该研究采用的被动NH_(3)采样方法对环境NH_(3)浓度的测量具有较好的可靠性。实际观测结果显示,2022年上海市夏季环境NH_(3)平均浓度为(10.01±5.22)μg/m^(3),受2022年夏季极端高温气候影响,NH_(3)浓度水平明显高于已有研究结果。不同功能区的NH_(3)浓度排序为农业区[(13.36±5.24)μg/m^(3)]>工业区[(11.22±5.24)μg/m^(3)]>城区[(10.35±4.39)μg/m^(3)]>生态区[(4.28±2.4)μg/m^(3)],说明虽然与农业活动相关的监测站点NH_(3)浓度高值显著,但城区和工业区的非农业源排放对NH_(3)浓度的影响同样不可忽视。ALPHA被动采样方法能较好地捕捉城市不同功能区的NH_(3)浓度特征,可满足城市环境NH_(3)浓度观测应用,适用性验证及实际应用结果可为区域和城市NH_(3)的精准测In this study,the applicability of the ALPHA passive sampling method in terms of sampling adsorption filter preparation,sample preservation,and sampling period was carried out for ambient ammonia observation and compared with the active sampling method for validation,and further field observation application studies were conducted in different functional areas of Shanghai based on the results of the study.The results showed that the NH+4 content of the adsorption filters obtained by the acid immersion method was(0.27±0.13)μg,which was about 8%higher than that of the untreated adsorption filters,and the number of single immersions could be increased in the range of 1∶4-8∶4(slice/mL)to reduce the amount of solvent used in the preparation process.The preparation process of the acid immersion method and the different filter-to-liquid ratio treatments had few effects on the NH+4 content of the blank adsorption filter.The method detection limit for this passive method of ambient ammonia determination was 0.08μg/m^(3) when the sampling temperature was 20℃and the sampling period was 168 h.The preservation method using the double-sealed bag,4℃frozen,and preserving for less than 30 days had not significantly increased the NH+4 content of the blank filter,which is suitable for the preservation of blank and sample filters.The applicability verification results of the sampling period showed that the number of the sampling period is recommended to be at least 6 days and at least 30 days for continuous sampling when using ALPHA passive sampling in urban areas to measure ambient ammonia.The observed NH_(3) concentration trends of the ALPHA passive sampling method and active sampling method were more consistent,and the measurement results were correlated well(correlation coefficient of 0.87,slope of 1.16),which further proved that the passive NH_(3) sampling method used in this study has good reliability for the measurement of ambient ammonia concentration.The actual observation results showed that the average ambient

关 键 词：NH_(3) 被动采样法 适用性 城市观测 

分 类 号：X830.2[环境科学与工程—环境工程]