南海重点海洋倾倒区表层沉积物富集特征及其潜在生态风险评价

根据2005南海三个重点海洋倾倒区,即九澳岛重点海洋倾倒区、黄茅岛重点海洋倾倒区、汕头重点海洋倾倒区的监测,分析其表层沉积物重金属的监测资料,采用富集系数法和Hakanson潜在生态危害系数法对其富集度和潜在生态危害程度进行了分析和评价.结果表明:在三个倾倒区表层沉积物所监测的重金属中,Cu和Pb元素的富集度相对最高,Hg和Cd元素的富集度较低,从空间上看,潜在生态危害系数评价结果显示,南海三个重点海洋倾倒区表层沉积物中的重金属对海洋生态系统的潜在生态危害非常轻微,均属于轻微潜在生态危害范畴,其中轻微潜在生态危害程度相对较重的是Cd和Hg元素,Cu和Pb元素的轻微生态危害程度较轻.

Enrichment of heavy metals in the surface sediments from the three regions of random dumping in South China Sea and assessment of their potential ecological risk

Based on the monitoring data of heavy metal in the surface sediments from the three regions of random dumping in the South China Sea ,which include the Jiuao Island random dumping and Huangmao Island random dumping in the Pearl River Estuary ,and Santou random dumping , the accumulating degree and the potential ecological risk of heavy metals were analyzed and assessed by using th method of accumulation coefficients and the method of potential ecological indices presented by Hakanson. The results showed that the accumulating degree of Cu and Pb appears high among all these heavy metal in surface sediments , As second and that of Hg and Cd lower. From space , the results of assessment of potential ecological risk demonstrated that the potential ecological risk of these heavy metal to the ocean ecology system is very light in the three regions of random dumping in the south China Sea , which belongs to the slight potential ecological risk level , Amony these heavy metals , the degree of slight potential ecological risk Cd and Hg appears higher , and of Cu and Cb is lighter.