Spatio-temporal distribution and environmental risk of arsenic in sediments of the East China Sea
Spatio-temporal distribution and environmental risk of arsenic in sediments of the East China Sea
复制标题
DOI：
10.1016/j.chemgeo.2012.12.009
复制
发表时间：
2013-02-24
期刊：
影响因子：
3.9
通讯作者：
Li, Ning
中科院分区：
文献类型：
--
作者：
Duan, Liqin;Song, Jinming;Li, Ning
为了解东海沉积物中砷的时空分布、环境风险和来源，收集了东海38个表层沉积物和3个沉积物岩心。沉积物中砷的浓度范围为1.70 ~ 22.1 μ g/g，平均为11.5 μ g/g。As浓度与粘土+粉土、总有机碳（TOC）含量呈正相关，在长江口和杭州湾口附近As值较高，说明细粒沉积物和河流输入是控制As分布的主要因素。化学组分分析、沉积物质量指标及地质堆积指数表明，东太平洋沉积物中砷含量为低风险、低不良影响和中等污染水平。As浓度和埋藏通量的垂直剖面，结合Pb-210测年，反映了近百年来东太平洋As污染的历史。百年前呈稳定趋势，20世纪初至90年代略有上升，80、90年代达到峰值，90年代后呈下降趋势，1998年呈较低值。这些趋势与自然活动和人为活动密切相关。(c) 2012 Elsevier B.V.版权所有
To understand the spatial and temporal distributions, environmental risks and sources of As, 38 surface sediments and three sediment cores were collected in the East China Sea (ECS). As concentrations in sediments ranged from 1.70 to 22.1 mu g/g with an average of 11.5 mu g/g. As concentration had positive correlations with clay + silt and total organic carbon (TOC) content with higher As values near the Changjiang Estuary and Hangzhou Bay mouth, indicating fine-grained sediments and riverine inputs as the main factors controlling As distribution. Chemical fraction analysis, sediment quality guidelines, together with geoaccumulation index, suggested that As in sediments of the ECS was at low risk, low adverse effect and moderately polluted level. Vertical profiles of As concentrations and burial fluxes, combined with Pb-210 dating, reflected the As pollution history in the ECS within the last one hundred years. It showed a stable trend before one hundred years ago, a slight increase from the 1900s to 1990s, with peak values in the 1980s and 1990s, and a declining trend after the 1990s to 2009 with a relatively low value in 1998. These trends were closely associated with both natural and anthropogenic activities. (c) 2012 Elsevier B.V. All rights reserved.