引用本文:陆喜红,任兰,吴丽娟.南京市大气PM2.5 中重金属分布特征及化学形态分析[J].环境监控与预警,2019,11(1):40-44
LU Xi-hong,REN Lan,WU Li-juan.Research on the Distribution Characteristics and Chemical Speciation of Heavy Metals in PM2.5 in Nanjing[J].Environmental Monitoring and Forewarning,2019,11(1):40-44
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南京市大气PM2.5 中重金属分布特征及化学形态分析
陆喜红,任兰,吴丽娟
作者单位
陆喜红,任兰,吴丽娟 江苏省南京环境监测中心江苏 南京 210013 
摘要:
于 2017年1、4、7、10月在南京市主城区采集了大气PM<sub>2.5</sub>样品,用BCR法对PM<sub>2.5</sub>中重金属进行连续提取,采用电感耦合等离子体-质谱法进行测定,分析重金属在颗粒物中不同形态和分布特征。结果表明,PM<sub>2.5</sub>中9种重金属质量比排序为:Fe>Zn>Pb>Mn>Cu>Cr>As>Ni>Cd。Zn、Pb、Cd、Cu、Mn、As主要分布在弱酸提取态;Ni在弱酸提取态、可氧化态和残渣态中分布较均匀,占比26%~37%;而Fe、Cr主要以残渣态存在,分布比例分别为71%和54%。PM<sub>2.5</sub>中Zn的生物有效性系数>0.8,属生物可利用性元素,表明其在环境中迁移能力最强,其余8种重金属生物有效性系数为0.2~0.8。
关键词:  南京  细颗粒物  重金属  化学形态  大气环境
DOI:
分类号:X823
文献标识码:B
基金项目:南京市环保局环保科研基金资助项目(201604)
Research on the Distribution Characteristics and Chemical Speciation of Heavy Metals in PM2.5 in Nanjing
LU Xi-hong,REN Lan,WU Li-juan
Abstract:
During January, April, July and October 2017, PM<sub>2.5</sub> samples were collected at urban sites in Nanjing, while the distribution characteristics and chemical speciation of heavy metals were analyzed by BCR extraction and ICP-MS. The results showed that the heavy metal concents were ranked as: Fe>Zn>Pb>Mn>Cu>Cr>As>Ni>Cd. Zn, Pb, Cd, Cu, Mn and As in PM<sub>2.5</sub> existed mainly in the acid-exchangeable species.The proportion of Ni in the acid-exchangeable species, oxidizable species and residual species were near, accounting from 26% to 37%. Approximately 71% of Fe and 54% of Cr existed in the residual species. The bioavailability coefficient (k) of Zn in PM<sub>2.5</sub> were the highest, indicating the strongest migration ability in the environment, while the k values of other eight heavy metals ranged from 0.2 to 0.8.
Key words:  Nanjing  PM2.5  Heavy metal  Chemical speciation  Atmospheric environment