Determination of heavy metal profiles in dated sediment cores from sai kung bay, hong kong

摘要

reight sediment cores from Sai Kung Bay area were sampled and analysed for Cd, Cr, Cu, Fe, Ni, Pb, Zn, Ca, and organic matters. the cores were dated from an overall consideration of the ~210Pb And maximum ~137Cs activities, and historical records of previous land use, past heavy typhoon and Rainstorm activities. Contamination by Cd, Cr, Cu, pb, and Zn was found at coastal cores with a Mean Enrichment Factor of 5.0, 1.0, 1.7, 1.4, and 1.3, respectively. The overall mass sedimentation Rates were found varying from 0.111-0.454 g/cm~2.y and recent average anthropogenic fluxes in μ/cm~2.y for coastal/offshore cores were estimated as 0.52/0.028(Cd), 2.0/0.26(Cr), 7.6/0.92(Zn), 2.8/1.4(Cu), and 2.9/2.3(Pb), respectively.