PM10 samples were simultaneously collected at Dingzikou sampling site(urban site) and Fenghuang mountain sampling site( background site )from March 2012 to February 2013 in Zunyi city,and the pollution characteristics,sources and ecological risk of elements in PM10 were analyzed and assessed.The results indicated 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 enrichment 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 PM10was Cd>Pb>As>Cu>Zn>Ni>Cr,in which the potential ecological risk degree of Cd reached terribly strong. |