摘要
针对2007年12月至2008年1月在乌鲁木齐市采集的可吸入颗粒物(PM2.5-10和PM2.5),采用消解法和双道原子荧光光法(AFS)、电感耦合等离子体质谱仪法(ICP-AES)分析了样品中的5种重金属元素,并对MP10-2.5和PM2.5中重金属的污染水平和人类活动的贡献进行了评价.结果表明:PM10-2.5质量浓度平均值187μg/m3,超过国家二级标准(150μg/m3)的1.25倍、PM2.5质量浓度平均值为279μg/m3,超过美国EPA1997年颁布的PM2.5日平均值65的4.3倍.PM10-2.5和PM2.5中Pb的污染指数1<Igeo<10为重污染、Cd、Hg的Igeo>10为严重污染.富集因子分析得出乌鲁木齐市Cd和Hg元素的EF值大于10,说明这些元素主要是人为源贡献,受土壤扬尘的影响较少;而Co、Pb元素的EF值在1～10之间,说明其主要来自自然来源.
PM10-2.5 and PM2.5 aerosol samples were collected with The NL20 cascade impact sampler in Urumqi during winter. Total concentration and chemical speciation of 5 heavy metals in PM10-2.sand PM2.5were quantified by acid digestion method and analyzed by Atomic Fluorescence Spectrometry（AFS）, Inductively Coupled Plasma Atomic Emission SpectrometrY （ICP-AES）. The pollution level of these metals was also evaluated. Results showed that PM10-2.5, PM2.and heavy metal concentration were significantly high in Urumqi city. 187μg/m3average concentration of PM10-2.5 is 1.25 times higher than outdoor PM10-2.sSecondary Standard recommended by Chinese National Standards and 279μg/m3 average concentration of PM2.5 is 4.3 times higher than outdoor PM10_2.sSecondary Standard recommended by US-EPA. High enrichment factor values （EF〉10） were obtained for Cd, Hg, reflecting the importance of anthropogenic inputs. In contrast, Kvalues of Co and Pb was among 1 to 10, suggested that they were mainly from natural sources except for human activities. According to the results of mull indexes evaluating, the mull indexes of Pb was 1 〈 Igeo 〈 10 indicated heavily polluting and Cd, Hg was Igeo 〉 10 indicated serious pollution.
出处
《新疆大学学报（自然科学版）》
CAS
2010年第3期338-342,共5页
Journal of Xinjiang University(Natural Science Edition)
基金
2007年自治区自然科学基金资助(200721101)
关键词
乌鲁木齐
可吸入颗粒物
重金属
污染水平
Urumqi
inhalable atmospheric
particle
heavy metal
pollution level
