The cause attributed to the point source situated in sample site I. The heavy metal in sediment contamination factors were very high for Zn (18.15), Hg (6.67), Pb (5.64) and considerable for Cd (2.6), Cu (2.54), Ni (1.72), C r (1.02), As (0.098).
After synthetical analyse of the vertical distribution of sediment contamination, the character of sedimentary facies, the influence degree of mainly contamination by human beings, the biology characteristic of submerged plant, the hydrodynamic characteristic of sediment ary soil, the geochemistry characteristic of deposit, and the parameter of elevation control after dredging, the suitable depth of dredging is between (40 cm) and 50 cm.
Total PAHs concentration ranged from 229.17 to 609.94 ng/g dw. The degree of surface sediment contamination by PAHs in study area is moderate/high in comparison with other surface sediments.
The development of Yantai city and Yantai Port have been seriously hurtful to Zhifu Bay. This article makes use of some information from the fieldwork on Zhifu Bay in resent years, and researches into the actuality and evolvement trend of seawater environment, characteristic of sediment contamination, content and distributing of heavy metal in resent 20 years, influence from human activity and industrial construct.
The correlation between biodiversity and growth potential was estimated at 0.7658 and that between sediment contamination and natural variability at -0.3769.
Sediment contamination had a negative direct effect on biodiversity of magnitude -0.1956 and a negative indirect effect on growth potential via biodiversity of magnitude -0.067.
In particular, we were interested in measuring the direct, indirect, and total effects of sediment contamination and natural variability on biodiversity and growth potential.
We hypothesized and tested a conceptual model to characterize the interdependencies between four latent variables-sediment contamination, natural variability, biodiversity, and growth potential.
Moreover, in order to provide information on the ecological impact of sediment contamination on aquatic biota Numerical Sediment Quality Guidelines (SQGs) and sediment toxicity bioassays were carefully recommended.
An analysis has been made of petroleum contaminated river sediments sampled from the main river and two affluent streams of Yanhe River.The results show that river sediments along the investigated river sections are all contaminated by petroleum to a certain extent.Oil contamination loads of the main river sediments generally are 40～80mg/kg,but higher loads, on the average of 390mg/kg and the highest to 784mg/kg,are found in the sediments of upstream and the tributary confluent...
The analysis of PAHs in 14 surface sediments of tidal flats of the Yangtze Estuary showed that total PAHs concentration ranged from 0.263 to 6.372mg/kg. The contents of total PAHs varied dramatically with the sampling region. They are characterized by greatest content near sewage discharge point with trend to decrease by increasing distance. Petroleum-derived contamination may be dominant source in the study area, depending on the distributions of fluoranthene/pyrene and 2+3 ringed and 4 ringed ...
Features of the correlations between MgO and CaO, SiO2 and A12O3, trace element concentrations normalized to the primitive mantle and the Sr anormaly indicated that the evolution of the Emeishan Basalts was controlled mainly by the fractional crystallization of Ol + Cpx,and crustal contamination was less. The main geo-chemical characteristics of source mantle were remained. The primitive-mantle-normalized patterns and the correlation between Th/Yb-Ta/Yb imply that the Emishan Basalts were originated f...
sediment contamination
污染沉积物
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