College of Environment and Resources;
Jilin University;
Changchun 130012;
P R. China;
School of Environment and Nature Resources;
Renmin University of China;
Beijing 100872;
P R. China;
Daqing Vocational College;
Daqing 163255;
P R. China;
Jilin Province Environmental Monitoring Institution;
Changchun 130021;
P R. China;