渤海湾河口沉积物重金属污染及潜在生态风险评价

对渤海湾大神堂、高沙岭、海河、子牙河和南排河入海口表层沉积物和野生矛尾鰕虎鱼(除海河口)肌肉的As、Cd、Cr、Cu、Pb和Zn重金属进行了分析,发现各入海口表层沉积物重金属以Zn的浓度水平最高,平均达81.55mg/kg,而Cd最低(平均值为0.28 ± 0.08 mg/kg).在鱼体内, Zn浓度仍是最高(平均为96.75 ± 30.98 mg/kg),而Cd未检出.以生态危害指数法(RI)评价河口沉积物重金属的潜在生态风险表明,海河河口沉积物重金属的潜在生态风险最高,其他依次为子牙河口、南排河口、大神堂和高沙岭.另外,通过对各地鰕虎鱼肝脏金属硫蛋白的分析,发现子牙河的野生复鰕虎鱼金属硫蛋白较其他河口稍高(除海河),与沉积物重金属的RI分布一致.

Occurrence of heavy metals in surface sediments from estuaries in Bohai bay and their ecological risk assessment.

Heavy metals contamination in sediments affects marine ecosystems adversely.Th present study analyzed As.Cd,Cr,Cu,Pb and Zn ions in surface sediments and wildfish collected from estuary of Dashentang,Gaoshaling,Haihe,Ziyahe and Nanpaihe in Bohai bay were analyzed.Of six heavy metals,concentration of Zn was the highest(81.55mg/kg),and that of Cd was the lowest(0.28 ±0.08 mg/kg),and the same trend was also found in the muscle of widfish where Zn was the highest (96.75±30.98 mg/kg),and Cd was not detectable.The ecological risk of heavy metals in sediments using potential ecological index (RI) was estimated and the RI decreased in the order of Haihe>Ziyahe>Nanpaihe>Dashentang> Gaoshaling.Moreover,the metallothionein concentrations in wildfish from Ziyahe expect for Haihe were the highest,which was consistent to the RJ in sediments.