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natural sediments
A comparison of the fate and effects of prochloraz in artifical and natural sediments
      
This paper presents toxicity data for Chironomus riparius generated using radiolabelled Prochloraz? in systems using this artificial sediment and two natural sediments.
      
Laboratory experiments withBeggiatoa in natural sediments suggested that high light was the cause of the downward movement.
      
In this work we investigated the behaviour of pure HgS during extraction with dilute HCl to establish its extractability in 1 and 6?M HCl at the concentration level close to those occurring in natural sediments and soils.
      
Untreated azoic and natural sediments served as controls.
      
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.
      
The traditional concept of the relationship between metal content and grain size assumes that the fine fraction carries most of the metals in natural sediments.
      
The redox processes as well as the establishment of lateral redox sequences along a flowpath were investigated in column experiments containing natural sediments from a sand aquifer.
      
Charcoal, the remains of Holocene fires recorded in natural sediments, allows a new approach to the study of forest evolution in the mountains of the Mediterranean region.
      
As many natural sediments with deposit-feeders are completely pelletized we conclude that pellet breakdown rate is an important limiting factor to deposit-feeder density and that coprophagy may be avoided in deposit-feeding mollusks.
      
Existing texture segmentation algorithms could not delineate the subtle and continuous texture variations that exist in natural sediments.
      
Release rates of polynuclear aromatic hydrocarbons from natural sediments and their relationship to solubility and octanol-water
      
Uptake of 109Cd from Natural Sediments by the Blue Mussel Mytilus trossulus in Relation to Sediment Nutritional and Geochemical
      
andVibrio alginolyticus, were mixed with natural sediments from the field and fed toAbarenicola vagabunda, an intertidal lugworm characteristic of sandy beaches in the Pacific Northwest.
      
These results indicate that radio-active tracers can be used in natural sediments to selectively label potential microbial food of invertebrate grazers.
      
This conversion rate points to the same equilibrium ratio as was observed in natural sediments, indicating an equilibrium between methylation and demethylation reactions in the sediments.
      
It is concluded that extreme caution should be used when applying the solid-phase Microtox? protocol to assess the toxicity of natural sediments, covering a range of granulometry and contamination situations.
      
Natural sediments were used to produce settled beds in the Lab Carousel, an annular flume of 2?m diameter.
      
Furthermore, we have demonstrated that the solubility of pure metal sulfide minerals and their iron-metal derivatives in HCl directly correlates with the observed trends in the ''Degree of Trace Metal Pyritization'' in natural sediments.
      
The mixture of polluted sediments with bottom natural sediments and the autochthonous contribution of organic matter mitigate the pollution levels progressively towards the center of the lake.
      
 

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