The Heavy Metal Pollutions in Suspended Particulate Matter of Hongfeng Lake in Guiyang City and Their Potential Ecological Risk Assessment

Seasonal and spacial characteristics of heavy metals(Zn、Cu、Cr、Pb and Cr) in suspended particulate matter(SPM) of Hongfeng Lake were studied,and potential ecological risks brought by these heavy metals in SPM were assessed using Hakanson potential ecological risk index method.Results showed that seasonal and spacial variations of the selected heavy metals' contents in SPM of Hongfeng Lake were quite remarkable,and that overall potential ecological risk was mainly generated by Cd and Pb,whose potential ecological risks were identified as the considerable and the moderate levels,respectively,and that other heavy metals(Zn、Cu、Cr) only caused slight ecological risks.The overall potential ecological risk index(RI) was estimated as 226.09,indicated that the overall potential ecological risk produced by the selected heavy metals in SPM of Hongfeng Lake had reached the moderate level.Potential ecological risk index(RI) of the selected heavy metals in SPM of Hongfeng Lake increased seasonally in the sequence of October,December,April,June and February,and increased spacially in the sequence of South Lake,Maxian River,North Lake,Yangchang River,Houliu River,Taphuayuan River,Maotaio River,Maibao River,and Huafeichang River.