摘要
对贵州省主要城市(贵阳、安顺、遵义、都匀)按季节进行PM_(2.5)样品的采集,应用质粒DNA评价法研究了贵州省主要城市PM_(2.5)氧化性损伤能力,并与PM_(2.5)质量浓度、微量元素含量做相关性分析。结果表明,PM_(2.5)全样TD_(20)值均小于其相应的水溶样TD_(20)值;四个城市PM_(2.5)氧化性损伤能力均表现为冬季>秋季>春、夏季;城区PM_(2.5)氧化性损伤能力强于背景区;研究区内PM_(2.5)样品的氧化性损伤能力表现为都匀市最强,安顺市最弱;PM_(2.5)全样和水溶样的TD_(20)值与质量浓度之间无明显相关关系;PM_(2.5)水溶样的TD_(20)值与相应的12种微量元素的浓度总和呈负相关关系(P<0.05);全样Al、Mn、Cd、Pb的含量与PM_(2.5)全样TD_(20)值呈明显负相关关系,水溶样Cd、Pb、Cu的含量与PM_(2.5)水溶样TD_(20)值呈明显负相关关系,表明研究区PM_(2.5)氧化性损伤可能与样品中水溶性元素Cd、Pb、Cu等的含量有关。
PM_(2.5) samples were collected seasonally in four main cities(Guiyang,Anshun,Zunyi,and Duyun)in Guizhou Province to study the oxidative damage capacity of PM_(2.5) by in vitro plasmid DNA assay.The correlation between the toxicity represented by oxidative damage capacity and the contents of trace elements and mass concentrations were investigated.The results showed that,the TD_(20) values of the whole samples were less than the corresponding TD_(20) values of the water-soluble fractions.In the four cities,PM_(2.5)oxidative capacity was the strongest in winter,followed by autumn and weak in spring and summer.PM_(2.5) oxidative damage capacity in urban areas is stronger than in suburban areas.The oxidative damage capacity of PM_(2.5) was strongest in Duyun and weakest in Anshun.Correlation analysis showed there was no obvious correlation between the TD_(20) value and mass concentrations of PM_(2.5).The TD_(20) value of water-soluble fraction showed a general(P<0.05)negative correlation with the sum of 12 trace element concentrations in PM_(2.5).The content of aluminum,manganese,cadmium,and lead is significantly negatively correlated with the TD_(20) value of whole sample.The content of cadmium,lead,and copper has a significant negative correlation with the TD_(20) value of water-soluble samples.It shows that the oxidative damage capacity of PM_(2.5) in the major cities of Guizhou probably relates with the contents of water soluble cadmium,lead,and copper in samples.
作者
杨玉双
陶芸
李金娟
郭兴强
李晨
施伟
YANG Yushuang;TAO Yun;LI Jinjuan;GUO Xingqiang;LI Chen;SHI Wei(The College of Resources and Environmental Engineering,Key Laboratory of Karst Georesources and Environment,Ministry of Education,Guizhou University,Guiyang 550000,China)
出处
《地球与环境》
CAS
CSCD
北大核心
2021年第6期717-725,共9页
Earth and Environment
基金
国家自然科学基金项目(41265008)。
