生态环境学报Issue(11)：1878-1885,8.DOI:10.16258/j.cnki.1674-5906.2015.11.019
三亚河沉积物中重金属生态风险评价与污染历史
Eco-risk Assessment and Contamination History of Heavy Metals in the Sediments of Sanya River
摘要
Abstract
The distribution, enrichment, eco-risk and contamination history of heavy metals in sediments of Sanya River were investigated in this study. It can provide helpful information on the pollution control and marine environmental protections of Sanya River. The results indicate that the concentrations of Cu, Zn, Pb, Cd, As, Cd, Hg, Ni, Al2O3 and TOC in the surface sediments are (3.9±1.7), (100.4±38.9), (32.0±8.3), (28.8±11.5), (10.27±4.61), (0.181±0.110), (0.204±0.091), (22.7±8.0)μg·g-1, 10.34%±5.49% and 1.29%±1.23%, respectively.210Pbex was utilized to determine the mean sedimentation rate and establish the deposition chronology. The mean sedimentation rate is about 0.89cm·a-1 in study area employing the constant concentration model of210Pbex and the deposition period of the retrieved sediment core is 1918─2014. The backgrounds of the eight heavy metals obtained from the core bottom unaffected by human activities are 7.5, 38.7, 14.3, 31.9, 4.95, 0.027, 0.015 and 6.4μg·g-1, respectively. The arithmetic mean values of Pb, Zn, Cu, Cd, Hg and TOC enrichment factors normalized by Al element all exceed 1.5 in surface sediment, implying most of these metals and organic matters are originated from human activities. The concentrations of Cu, Zn, Pb and Hg in the sediment core also demonstrate evident increasing and enrichment tendencies above 45 cm depth (after the year of ca. 1960), which are induced by the excessive input of anthropogenic pollution. The Pearson correlation coefficients between TOC and Pb, Cr, Cd, Zn and Cu are 0.56~0.85, suggesting the adsorption of humic acidproduced by organic matter degradation is the principle factor dominating the enrichments of heavy metals in sediments. According to the sediment quality guidelines of US NOAA screening quick reference, adverse biological effects have been induced by Hg in the sediments of study area since its concentrations at most stations fall between the ERL and ERM threshold. The annual sedimentation flux of heavy metals received by Sanya River in recent years is estimated at about2.26 g·m-2·a-1, in which Zn is dominated and accounts for a proportion of 50.6%. The proportions of Pb, Cr and Cu are 16.1%, 14.5% and 11.5%. The more toxic metals of Hg and Cd only occupy 0.10% and 0.09% in the flux.关键词
重金属/沉积物/风险评价/污染历史/三亚河Key words
heavy metals/sediment/Eco-risk assessment/contamination history/Sanya River分类
海洋科学引用本文复制引用
甘华阳,何海军,张卫坤,林进清..三亚河沉积物中重金属生态风险评价与污染历史[J].生态环境学报,2015,(11):1878-1885,8.基金项目
中国地质调查局项目（1212010914020）“华南西部滨海湿地地质调查与生态环境评价” （）
