摘要
为研究西安城郊农村大气PM_(10)和PM_(2.5)中主要化学组分特征,于2014年12月至2015年10月在西安户县草堂寺采集颗粒物样品,分析了每组样品中的16种无机元素、8种水溶性离子、有机碳(OC)和元素碳(EC),对颗粒物和化学组分的浓度水平、时间变化特征进行了讨论。结果表明:(1)PM_(2.5)、PM_(10)年平均值分别为(79.78±59.12)、(118.09±79.27)μg/m^3。(2)PM_(2.5)及PM10中地壳元素浓度总体表现为春季高、秋季低;微量元素浓度表现为冬季高、夏季低。(3)PM_(2.5)和PM_(10)中SO_4^(2-)、NH_4^+、NO_3^-浓度总体表现为冬季>秋季>春季>夏季。(4)冬、春季OC、EC明显高于夏、秋季;由OC/EC的最小值估算得到PM_(2.5)、PM_(10)中二次有机碳(SOC)年平均值分别为(7.90±8.89)、(8.55±8.50)μg/m^3,冬、春季SOC明显高于夏、秋季;秋、冬季OC、EC相关性较强,而春、夏季较弱。
Daily aerosol samples （PM10 and PM2.5 ） were collected continuously from Dec. 2014 to Oct. 2015 in Caotang Temple sites in Huxian and the concentrations of 16 mineral elements,8 water-soluble ions and elemental carbon （EC） and organic carbon （OC） were determined, meanwhile mass reconstructions were conducted,to charac-terize the chemical composition of PM10 and PM25 over suburb of Xi＇an. The results showed th a t： （1 ） the annual average concentrations of PM2.5 and PM10 were （79.78 ± 5 9 .1 2 ） , （118.09 ± 79.27） μg/m^3. （2 ） The concentrations of crustal elements were highest in spring,and lowest in autumn; while the concentrations of trace elements were highest in winter,and lowest in summer. （3） The average concentrations of three highest abundant ions （SO4^2- , NH4^＋ and NO3 ） all showed the same seasonal variation trend： winter〉autumn〉spring〉summer. （4 ） OC and EC were higher in winter and spring than in summer and autumn. The minimum OC/EC ratio method was used to estimate concentrations, the annual average SOC concentrations in PM2.5 and PM10 were （7.90 ± 8 .8 9 ） , （8 .5 5 ±8.50） jug/ m^3 , respectively. The average SOC concentration in winter and spring were significantly higher than in summer and autumn？and the OC and EC correlation was stronger in autumn and winter,weak in spring and summer.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2017年第5期540-548,共9页
Environmental Pollution & Control
