| Yuqiao Reservoir, an important adjusting reservoir in the project of diverting water from the Luanhe River to Tianjin City, is important water resource for Tianjin City. The potential ecological risk of heavy metals were assessed by using Hankanson ecological risk index methods and the sources of heavy metal contamination were estimated with correlation analysis after the sediments samples from three tributaries of Yuqiao reservoir were collected and the concentrations of heavy metals such as cadmium（Cd）, lead（Pb）, chromium（Cr）, copper（Cu）, zinc（Zn）, manganese（Mn） and nickel（Ni） were analyzed by ICP-MS. The results showed that sediments of three tributaries of Yuqiao reservoir are uncontaminated by Cr, Pb, lightly contaminated by Ni, Cu, Zn, moderately contaminated by Cd. The Hankanson’s ecological risk factor of Cd averagely was 106.78, meaning the highest level ecological risk. The ecological risk of Shahe River in three tributaries was at highest level. The total potential ecological risks of heavy metals in sediments were at low level assessed by potential ecological risk index. The ecological risk of Bahuzhuang sampling site of Shahe River was at medium level ecological risk, the sampling site near Zunhua city was at the intensity level and the Xiliucun sampling site was at high intensity level. There was better correlation between Zn and Cd with correlation analysis. The resource of heavy metals pollutants of three tributaries of Yuqiao Reservoir may be controlled by mining area distribution and riverway shape. |
