River sediments Meuse

Sediments were mainly sampled in autumn. Two samples taken in spring showed concentrations comparable with those found for the same locations in autumn. Significant levels of 0.3—2.8 p-g g-1 dry weight (d.w.) of NPEO were found in the Dommel, a small tributary of the river Meuse, in samples taken downstream from the effluent discharge of a municipal WWTP, and in samples from the Rhine, Scheldt and Meuse rivers. Elevated levels of NP (0.5—3.8 p,g g-1) were... 

De Voogt et al. [23] analysed marine and estuarine sediments from 22 sites in northwestern Europe (extending from Ireland and France to Norway and Sweden) by HPLC-FL. NP, OP, AgPEO and AgPEO concentration ranges of 0.1-17, highest levels were found in the estuaries of the rivers Seine, Mersey, Rhine/Meuse, Weser and Elbe. 

Common tern (Sterna hirundo) breeding in the sedimentation area of Rhine and Meuse rivers, were affected by non- and mono-ortho CB contamination, compared to the clean inland colony near Zeawolde [71]. Studies on double crested cormorants (Phalacrocorax auritus) using CB-126, 2,3,7,8-TCDD, and extract derived from field collected eggs revealed that chicken (Gallus domesti-cus) is at least 70 times more sensitive to developmental abnormalities such as pronounced edema [72],... 

Figure 22 Adsorption of trace metals by the Meuse River bottom sediments measured data in NaN03 0.01 M and interpretation (curves) in terms of adsorption.

Kralingen, Netherlands [83] Surface water Meuse River Coagulation Sedimentation Ozonation Dual layer filtration Carbon filtration Safety chlorination Protection against periodic taste/odor and toxic substances Removal of THM s produced by chlorination Removal of matter produced by or unsuccessfully removed by ozonation Particle size 0.8 mm Bed deptli 4 m Bed diameter 6 m Volume per filter 116 m" Contact time 12 min. 

Den Besten, P.J., Smidt, C.A., Ohm, M., Ruijs, M.M., Van Berghem, J.W. and Van de Guchte, C. (1995) Sediment quality assessment in the delta of the rivers Rhine and Meuse based on field observations, bioassays and food chain implications. Journal of Aquatic Ecosystem Health, 4, 256-270. 

Van den Berg, G.A., 1998. Geochemical behaviour of heavy metals in a sedimentation area of the rivers Rhine and Meuse, Ph.D. thesis, Utrecht University, The Netherlands. 

Van den Berg, G.A., Loch, J.P.G., Van der Heijdt, L.M., Zwolsman, J.J.G., 1998a. Vertical distribution of acid-volatile sulfide and simultaneously extracted metals in a recent sedimentation area of the river Meuse in The Netherlands. Environ. Toxicol. Chem. 17, 758-763. 

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