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natural sediment
Effects of natural sediment properties on test results in bioassays with oyster larvae (Crassostrea gigas) on sediment elutriate
      
Testing sediment elutriates with oyster larvae in a sediment-water system invokes specific problems related to natural sediment characteristics.
      
This protocol has been applied to the quantification of 12 individual PAHs, 8 individual PCBs and 8 PCB coeluted mixtures from two Standard Reference Materials and one natural sediment.
      
Characterization of ligand sites on natural sediment particles
      
Further, extraction with 5% acetic acid in 0.2% TFA-methanol was used for analyses of MCs in 34 natural sediment samples collected from Brno reservoir (Czech Republic) from April to October 2005.
      
I were measured after 14?d of exposure to natural sediment, sediment contaminated with fluoranthene (in acetone) and sediment treated with acetone only.
      
Temporal changes of macrobenthic communities in defaunated sediment were analyzed by univariate and multivariate statistics, and compared with those in undisturbed natural sediment at the same site.
      
Food concentration was varied experimentally using sieved (1?mm) natural sediments (Md?φ=2.00; 0.6% organic) mixed with combusted (500?°C, 8?h) sediments for final concentrations of 25, 50, and 100% natural sediment.
      
Temperature and food concentration both significantly affected feeding rates, with maxima occurring at 50 and 100% natural sediment mixtures, and at high (16?°C) temperature.
      
The diatom (Thalassiosira weissflogii) was radiolabeled with 109Cd, and the natural sediment was radiolabeled with 65Zn.
      
Seismic reflection profiles distinguish spoil from natural sediment and show that the infilling sediment is trapped between, burying reef structures built during Quaternary lower stands of the sea.
      
The geochemical normalization of metal data to Li or Al has also demonstrated that the anthropogenic input of heavy metals have altered the natural sediment heavy metal distribution.
      
Three out of three populations tested had higher maximal growth rates and two of three populations approached their asymptotic size more quickly on sand than on silt-clay fractions of natural sediment.
      
The system was build in 1975, filled with sea-water and natural sediment from a typicalArenicola marina habitat.
      
No significant differences in body burdens were detected for any of the compounds between mussels placed in corrals containing uncontaminated sand and those with natural sediment, suggesting the water phase represents the xenobiotic source.
      
The experimental system was based on two-compartment biotopes: natural sediment, from the Garonne River, and dechlorinated tap water.
      
Today, the development policy is in conflict with the maintenance and the preservation of natural sediment transport and deposition.
      
On deltas, the rate of relative eustatic sea-level rise is often smaller than the rate for isostatic-controlled subsidence and of the same order of magnitude as natural sediment compaction.
      
Considerably higher shear strength was observed in the natural sediment than in the experimental set up.
      
Natural sediment physicochemical differenceswere assessed, along with low-level anthropogenic contaminantsincluding copper, lead, zinc, phosphorus and nitrogen.
      
 

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