摘要
为研究太湖地区大气中主要含氮化合物的污染水平及其空间分布特征,选取代表城市、城郊、农村3种不同土地利用类型的苏州、常熟、宜兴作为研究区域,采用中流量大气采样器采集3个研究区春季大气和颗粒物样品,分析各形态含氮化合物的浓度.结果表明:春季太湖地区大气中气态含氮化合物NH3、HNO3和NO2的平均浓度分别为25.77、4.33和6.23μg·m-3(以N计,下同).其中,农村地区大气NH3浓度显著高于城市和城郊地区,具体表现为农村>城郊>城市,HNO3、NO2浓度三地差异不显著;颗粒态TN、NH+4和NO-3平均浓度分别为13.21、7.55和4.75μg·m-3.其中,TN、NH+4浓度城市和城郊地区存在显著差异,均表现为城郊>农村>城市,NO-3浓度城郊地区显著高于城市和农村地区,但城市和农村差异性不显著.实验结果同时显示,春季太湖地区大气中TSP的平均浓度为0.15 mg·m-3,城郊地区因为受到农业与工业的共同影响,应成为防控含氮化合物污染的重点区域.
To evaluate the atmosphere pollution levels and spatial distribution characteristics of major nitrogen compounds in the Taihu Lake region, Suzhou, Changshu and Yixing were selected to represent three types of land uses, cities, suburbs, and rural areas, respectively. Ambient air and TSP （Total Suspended Particulate） samples were collected by medium air flow samplers, and the concentrations of different forans of nitrogen compounds were analyzed. The results indicated that the average concentrations of the gaseous NH3 , HNO3 and NO2 in the Taihu Lake region were 25.77, 4.33 and 6.23 μg（N）· m-3, respectively. Concentrations of NH3 in the rural area were significantly higher than those of suburban and urban areas. However, no significant difference was observed on concentrations of HNO3 and NO2 among these areas. The average concentrations of particulate TN, NH4 and NO3 in this region were 13.21, 7.55 and 4.75 μg（ N）·m 3, respectively. Concentrations of TN and NH4＋ were significantly different between urban and suburban areas with the trend suburban〉rural〉urban. Concentrations of NO3＋ in the suburban area were significantly higher than those of urban and rural areas, while there was no significant differenee between urban and rural areas. Meanwhile, the experimental results also showed that the average atmospheric concentration of TSP in the Taihu Lake region in spring was 0.15 mg· m-3. Owing to the combined effects of agriculture and industry, suburban areas should become the focus in this region for controlling the nitrogen pollution.
出处
《环境科学学报》
CAS
CSCD
北大核心
2015年第7期2008-2015,共8页
Acta Scientiae Circumstantiae
基金
国家自然科学基金(No.41301578)
江苏省自然科学基金(No.BK20131047)~~
关键词
含氮化合物
气态
颗粒态
空间分布
太湖地区
nitrogen compounds
gaseous nitrogen
particulate nitrogen
spatial distribution
the Taihu Lake region
