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- W2377050703 abstract "The total concentrations and different forms of heavy metals were investigated and analyzed to evaluate pollution characteristics and potential release risk of heavy metals in sediment cores in an urban river of Chaohu City of Anhui province in China by using a modified BCR sequential extraction procedure.The result shows that the total concentrations of heavy metals range from29.5to224.3 mg·kg-1 for Pb,from21.3to 78.1 mg·kg-1 for Ni,67.5~1 126.3 mg·kg-1 for Cr,50.7~217.4 mg·kg-1 for Cu,respectively.Sediments from the East Ring River(ERR)located in the old town show significantly higher total concentrations of Pb,Ni,Cr,Cu than those from the West Ring River(WRR)in the new town.Especially,the differences in total Cr concentration between sampling sites are more significant,as compared to the other heavy metals.There are significant differences in vertical distributions of total concentrations of heavy metals in sediments cores from four sampling sites.In general,the two sediment cores from the WRR have significantly lower heavy metals and smaller variations with depths than those from the ERR.Due to historical heavy pollution,the ERR shows high concentrations of heavy metals not only in subsurface but also in deeper layers of the sediment cores and the heavy metals fluctuates dramatically with depths.The vertical distribution characteristics of heavy metals can well indicate the surrounding environment situation and heavy metal pollution dynamics.The ratios of exchangeable and carbonate-bound fractions in the total heavy metals are not more than 5%.Pb and Ni exist mainly in reducible and residual fractions,respectively.Cr exists mainly in oxidizable and residual fractions,and Cu exists mainly in reducible and residual fractions.Potential ecological risk assessment based on the ratio of secondary phase to primary phase(RSP)for the four sediment cores shows that sediment cores from the ERR have the significantly highest Rsp than those from WRR.Especially,the sediments from the ERR are moderately or heavily polluted with Pb and Cr based on the RSP analysis and have a potential and high ecological risk" @default.
- W2377050703 created "2016-06-24" @default.
- W2377050703 creator A5051771338 @default.
- W2377050703 date "2013-01-01" @default.
- W2377050703 modified "2023-09-23" @default.
- W2377050703 title "Chemical Speciation and Vertical Distribution Characteristics of Heavy Metals in Sediment Cores of an Urban River from a Typical Cityin Chaohu Lake Watershed" @default.
- W2377050703 hasPublicationYear "2013" @default.
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