遵义市PM_(10)中元素污染特征、来源与生态风险评价

Pollution Characteristics,Sources and Ecological Risk Assessment of Elements in PM_(10) in Zunyi City

采集2012年3月—2013年2月遵义市丁字口(市区点)、凤凰山(背景点)监测点的PM10样品,并对PM10中元素污染特征、来源和生态风险进行分析与评价。结果表明,遵义市PM10质量浓度季节变化为:冬季>春季>秋季>夏季,且市区点高于背景点,冬季超标率均为100%。PM10中As、Pb、Hg、Mn质量浓度市区点高于背景点,且均为冬季最高。富集因子分析表明,Pb、As、Cd、Hg、Mn、Cu、Zn来自人为污染,生态危害顺序为:Cd>Pb>As>Cu>Zn>Ni>Cr,其中Cd的潜在生态危害为极强。

PM10 samples were simultaneously collected at Dingzikou sampling site（urban site）and Feng-huang mountain sampling site（background site ）from March 2012 to February 2013 in Zunyi city,and the pollu-tion characteristics,sources and ecological risk of elements in PM10 were analyzed and assessed.The results indi-cated that the seasonal variations of average PM10 concentrations ranked as：winter〉spring〉autumn 〉summer, urban site were higher than background site,and compared with Ambient air quality standards,PM10 at two sites exceeded the standard by 100% in winter.The concentration of As,Pb,Hg,Mn in PM10 were higher in urban site than those of in background site,and for which were highest for seasonal variation winter.The results of enrich-ment factor showed that Pb,As,Cd,Hg,Mn,Cu and Zn in PM10 mainly sourced from anthropogenic pollution.The order of potential ecological risk indexes of elements in PM10 was Cd〉Pb〉As〉Cu〉Zn〉Ni〉Cr,in which the potential ecological risk degree of Cd reached terribly strong.