Key Laboratory of Coast and Island Development, Nanjing University, MoE, Nanjing 210093, China
王港潮滩重金属Pb、Zn和Cu的积累特征

The vertical accumulation of heavy metals and pollution status in Wanggang tidal flat were studied.The base value of 210Pb in Wanggang area was obtained as 1.16dpm/g.The fractal theories were led into the quantitative study of pollution issues.The modern average sedimentary rate in Wanggang area is 4.13cm/a,according to the 210Pb analysis.Through the relativity analysis of heavy metals,it is educed that the Fe,Cu,Pb,Zn and Li have better pertinence in the area.After normalization,Cu and Zn remain stable values in the past 15 years.Cu shifts its value from 0.4-2,Zn from 1.5-2.6.The normalized heavy metal information dimension is high in the area,with loose systematic structure and lower organizational degree.The fractal dimension value of Zn moves from 3-6.5,average is 4.68,contemporary Cu from 5~6.5,average is 5.8085.The study shows that the heavy metal distribution in the area is mainly controlled by local geochemistry character,with limited contribution from human activities.Meanwhile,the fractal dimension of Pb normalization value is lower,in the scope of its fractal dimension flow varies from 2 to 5.5,with an average of 3.608.Higher levels of self-organization of Pb mean a certain degree of lead contamination.