期刊文献+
共找到1篇文章
< 1 >
每页显示 20 50 100
A 50-year sedimentary record of heavy metals and their chemical speciations in the Shuangtaizi River estuary(China):implications for pollution and biodegradation 被引量:2
1
作者 Baolin LIU Ke HU +2 位作者 Zhenglong JIANG Fengge QU Xin SU 《Frontiers of Environmental Science & Engineering》 SCIE EI CSCD 2011年第3期435-444,共10页
Two parallel sediment cores collected from tidal flat located in the Shuangtaizi River estuary were analyzed for heavy metal concentrations and chemical speciations.Based on the ^(137)Cs activity profile,mean sediment... Two parallel sediment cores collected from tidal flat located in the Shuangtaizi River estuary were analyzed for heavy metal concentrations and chemical speciations.Based on the ^(137)Cs activity profile,mean sedimentation rate at the sampling site during the past 50 years was estimated to be 1.3 cm·a^(-1).Correlation analyses show that almost all the metals are associated with each other,suggesting that these metals might be derived from same sources and/or affected by same geochemical processes.Influence of total organic carbon(TOC)content on the concentrations of Cr,Ni,Cu and Cd is evident.Silt and clay contents,instead of sand content,play an important role in the distribution of these metals.The dominant binding phases for most of the metals(except for Cd)are the residual.The relative decrease of the residual fraction of Cd and Pb in the upper 66 cm of the core is striking.The distribution of chemical fraction confirms that the residual fractions of these metals have a natural origin,while only the non-residual fractions of Cd and Pb increased upward the core due to pollution in the past five decades.Pollution assessment on these heavy metals based on Index of Geoaccumulation(I_(geo))also demonstrates that most of the metals are unpolluted.The weak pollution as observed in the sediments is perhaps related to a local plant,the Suaeda heteroptera Kitag,which may have played a significant role in the biodegradation of these metals and the metal distribution in the estuary. 展开更多
关键词 shuangtaizi river estuary sediment core heavy metals POLLUTION
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部