Consulta: creatorFacets:"Dehairs, F.A."
Registros recuperados: 37
Data/hora: 09/06/2024 04:28:33

Distribution of particulate trace elements in the Northeastern Atlantic
Provedor de dados: 27
Autores: Dauby, P.; Baeyens, W.F.J.; Biondo, R.; Bouquegneau, J.-M.; Chou, L.; Collette, O.; Dehairs, F.A.; Elskens, M.; Frankignoulle, M.; Loijens, M.; Paucot, H.; Wollast, R.
From 1989 to 1992, five cruises were conducted in an area covering the English Channel, the Celtic Sea and the Gulf of Biscay. During these campaigns, suspended matter was collected by different techniques in order to analyze the spatial and vertical distribution of several particulate trace elements in relation to the global biogeochemical cycle of carbon. It appears that horizontal distribution varies strongly from one element to another and is mainly influenced either by  anthropogenic and terrigenous inputs or by scavenging processes. On the other hand, the vertical distribution seems mainly linked to the primary production. In parallel to these trace element measurements, experiments were carried out to estimate the transfer rates of these elements...
Tipo: Info:eu-repo/semantics/article
Ano: 1993
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2680

Boundary conditions for heavy metals at the air-sea interface
Provedor de dados: 27
Autores: Dehairs, F.A.; Dedeurwaerder, H.; Dejonghe, M.; Decadt, G.; Gillain, G.; Baeyens, W.F.J.; Elskens, I.
During 1980 and 1981 the aerosol burden as well as the wet and dry atmospheric fall-out of Cu, Cd, Pb, Zn, Fe and Mn to the sea have been studied in the Belgian coastal area. Atmospheric Cu, Zn and Cd are observed to be introduced into the sea mainly by wet fall-out, while Fe, Mn and also Pb have a dry and wet fall-out of similar magnitude. Of these elements, Cu, Zn and Cd have the highest washout factors. Furthermore, for all elements, excepted Mn, discrepancies exist between washout factors above land and sea, with values up to 5 times larger above the sea.On the scale of the North Sea, atmospheric fall-out of Cu, Zn, Pb and Cd exceeds by one order of magnitude the combined input of the rivers Scheldt, Rhine and Meuse, while fall-out of Fe and Mn is of...
Tipo: Info:eu-repo/semantics/article
Ano: 1982
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=10065

The biological production of marine suspended barite and the barium cycle in the Western Mediterranean Sea
Provedor de dados: 27
Autores: Dehairs, F.A.; Lambert, C.E.; Chesselet, R.; Risler, N.
Suspended particulate barium was measured in the Western Mediterranean along 4 profiles sampled during the PHYCEMED 1 cruise in 1981. The non-terrigenous fraction of particulate barium (i.e. excess Ba; Ba&lt;sub&gt;xs&lt;/sub&gt;) can account for up to 96 % of the total barium. This fraction follows the barite settling and dissolution rate model we described earlier for the Atlantic Ocean, conforming barite as the carrier of excess barium. We propose that these Ba&lt;sub&gt;xs&lt;/sub&gt; concentrations, which are higher in the Western Mediterranean than in the overall Atlantic, may represent an adaptation of the microplankton to the high densities and density gradients of surface Mediterranean waters. A mass-balance for Ba in the Mediterranean Sea shows:...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Barite Barium Suspended inorganic matter MED; Western Mediterranean.
Ano: 1987
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3253

d&lt;sup&gt;13&lt;/sup&gt;C of Southern Ocean suspended organic matter during spring and early summer: Regional and temporal variability
Provedor de dados: 27
Autores: Dehairs, F.A.; Kopczynska, E.; Nielsen, C.; Lancelot, C.; Bakker, D.; Koeve, W.; Goeyens, L.
Observations are presented for stable carbon isotope abundance (&amp;#x3b4;&lt;sup&gt;13&lt;/sup&gt;C) and organic carbon and nitrogen content of suspended organic matter from the Southern Ocean (Circumpolar Current and Polar Front) during spring and early summer. The Polar Front Zone was characterized by elevated plankton biomasses and phytoplankton activity, which also increased significantly over the one-month investigation period. From the beginning of the phytoplankton bloom &amp;#x3b4;&lt;sup&gt;13&lt;/sup&gt;C values of suspended organic matter in the Polar Front were high, exceeding values predicted from the relationship with CO&lt;sub&gt;2(aq)&lt;/sub&gt; concentration observed in other areas of the Southern Ocean. Later in the season...
Tipo: Info:eu-repo/semantics/article
Ano: 1997
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=10202

Distribution, transport and fate of Bi, Cu, Cd, Hg, Pb, Sb and Zn in the Belgian coastal marine environment. Part IV: The river Scheldt as a transport route of heavy metals to the sea
Provedor de dados: 27
Autores: Baeyens, W.F.J.; Wartel, S.; Dehairs, F.A.; Decadt, G.; Bogaert, M.; Gillain, G.; Dedeurwaerder, H.
Tipo: Info:eu-repo/semantics/article
Ano: 1982
URL: http://www.vliz.be/imisdocs/publications/286409.pdf

On suspended barite and the oxygen minimum in the Southern Ocean
Provedor de dados: 27
Autores: Dehairs, F.A.; Goeyens, L.; Stroobants, N.; Bernard, P.; Goyet, C.; Poisson, A.; Chesselet, R.
Particulate Ba profiles were measured in the Indian sector of the southern ocean. The largest fraction (&gt;80%) of this barium is present as barite microcrystals. The profiles of total barium are characterized by a subsurface maximum between 200 and 500 m depth in the vicinity of the oxygen minimum. Highest barium values are found just south of the Polar Front, while lowest values occur close to the Antarctic Divergence. Between the divergence and the Polar front a tight inverse relationship is observed between oxygen in the oxygen minimum and barium in the barium maximum. This relationship disappears north of the Polar Front. Since suspended barite is known to be of biological origin, the correlation of barite with oxygen suggests that the observed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Barite Oxygen PS; Southern Ocean.
Ano: 1990
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3076

Advective excess Ba transport as shown from sediment and trap geochemical signatures
Provedor de dados: 27
Autores: Fagel, N.; André, L.; Dehairs, F.A.
We report the results of a geochemical study of sediment and trap material. Major and trace elements (Zr, Ba, rare earth elements, and Th) were analyzed on bulk sedimentary material collected along the NE Atlantic margin. Our aim is to test the widespread use of Ba-barite as a proxy for paleoproductivity in a continental margin area. This environment is of great interest because atmospheric-oceanic exchanges are important. In sediments, the geochemical signatures remain close to an upper crust reference, with flat shale-normalized rare earth elements patterns and constant elementary ratios. The calculated biogenic fraction of Ba or excess Ba (20-45%) remains lower than the excess Ba record in trap material (80-99%). The evolution of the geochemical...
Tipo: Info:eu-repo/semantics/article
Ano: 1999
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=10270

Particulate barium stocks and oxygen consumption in the Southern Ocean mesopelagic water column during spring and early summer
Provedor de dados: 27
Autores: Dehairs, F.A.; Shopova, D.; Ober, S.; Veth, C.; Goeyens, L.
Particulate barium was analysed in the upper 600 m of the Southern Ocean water column during repeated transects along the 6 degree W meridian in October-November 1992. The transects extended between the northern edge of the Weddell Gyre (57 degree 30'S) in the south to 47 degree S within the Polar Front Zone (PFZ) in the north. From earlier studies, it is known that the largest fraction of Ba in oceanic suspended matter occurs as barite micro-crystals. In the PFZ, an increase in the particulate Ba content in surface waters and at mesopelagic depths can be significant over the investigation period (1 month) and follows the increase of primary production during bloom development. Using an inverse one-dimensional advection-diffusion-consumption model,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Barium Biogeochemical cycle Carbon cycle Mixed layer Oxygen consumption Primary production PSW; Antarctic Ocean.
Ano: 1997
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=10209

Sedimentologisch onderzoek van de Spuikom te Oostende
Provedor de dados: 27
Autores: Wollast, R.; Dehairs, F.A.
Thirty sediment samples of the Scour Basin in Ostend were analysed for the boulder content, detric elements, carbonates, organic material and their Zn, S, Cu, Mn and P concentration were determined. Then correlations between all these factors were determined. The spread of most factors appeared bound to those of the boulder.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sediment analysis Sediments ANE; Belgium; Oostende Harbour; Sluice Dock.
Ano: 1972
URL: http://www.vliz.be/imisdocs/publications/327693.pdf

Accumulation of suspended barite at mesopelagic depths and export production in the Southern Ocean
Provedor de dados: 27
Autores: Dehairs, F.A.; Baeyens, W.F.J.; Goeyens, L.
Tipo: Info:eu-repo/semantics/article
Ano: 1992
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=10162

The distribution of Fe in the Antarctic Circumpolar Current
Provedor de dados: 27
Autores: Löscher, B.M.; de Jong, J.T.M.; de Baar, H.J.W.; Veth, C.; Dehairs, F.A.
Tipo: Info:eu-repo/semantics/article
Ano: 1997
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=10213

Spatiotemporal variability of inorganic nitrogen stocks and uptake fluxes in the Scotia-Weddell Confluence area during November and December 1988
Provedor de dados: 27
Autores: Goeyens, L.; Sörensson, F.; Tréguer, P.; Morvan, J.; Panouse, M.; Dehairs, F.A.
Tipo: Info:eu-repo/semantics/article
Ano: 1991
URL: http://www.vliz.be/imisdocs/publications/279127.pdf

Quantitative in-situ microanalysis of minor and trace elements in biogenic calcite using infrared laser ablation - inductively coupled plasma mass spectrometry: a critical review
Provedor de dados: 27
Autores: Vander Putten, E.; Dehairs, F.A.; André, L.; Baeyens, W.F.J.
Tipo: Info:eu-repo/semantics/article
Ano: 1999
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=10258

The leading role of ammonium in the nitrogen uptake regime of Southern Ocean marginal ice zones
Provedor de dados: 27
Autores: Goeyens, L.; Dehairs, F.A.; Tréguer, P.; Bauman, E.M.; Baeyens, W.F.J.
The nitrogen signature of marginal ice zones in the Southern Ocean often departs from the "classical" Antarctic nutrient profiles with high nitrate and low ammonium values in the surface layer. Weddell Sea marginal ice zones e.g. show enhanced nitrate depletions, amounting to similar to 500 mmol N m super(-2). Additionally, ammonium stocks in the upper layer can be up to 7% of the inorganic nitrogen pool. The corresponding nitrogen uptake regime suggests elevated nitrate assimilation during the early phase of the productive season and significantly reduced nitrate assimilation at a later stage. Absolute as well as specific nitrate uptake rates decrease by an order of magnitude when ammonium stocks exceed 1.7% of the total inorganic nitrogen. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Algal blooms Ammonium compounds Ice cover Marginal seas Nitrogen cycle Phytoplankton Primary production PS; Antarctic Ocean.
Ano: 1995
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=10188

Discrete suspended particles of barite and the barium cycle in the open ocean
Provedor de dados: 27
Autores: Dehairs, F.A.; Chesselet, R.; Jedwab, J.
Barite particles are a universal component of suspended matter in the Atlantic and Pacific Oceans. This is demonstrated by scanning electron microscope and electron microprobe analyses of samples collected during the GEOSECS program. These discrete particles, about 1 µm in diameter, account for by far the greatest part of the total particulate barium of most of the filters collected at different depths. Total particulate barium (mean value: 20 ng/kg seawater) was measured on the same filters by instrumental neutron activation analysis.Several observations indicate that biochemical, rather than purely chemical, processes are involved in the formation of the BaSO4 mineral in the water column. Sr/Ba molar ratios among the individual barite grains,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Barite; Barium.
Ano: 1980
URL: http://www.vliz.be/imisdocs/publications/228699.pdf

Improved estimation of f-ratio in natural phytoplankton assemblages
Provedor de dados: 27
Autores: Elskens, M.; Goeyens, L.; Dehairs, F.A.; Rees, A.; Joint, I.; Baeyens, J.
Statistical properties in non-linear regression models of &lt;i&gt;f&lt;/i&gt;-ratio versus nitrate relationships were investigated using a case study conducted at the European continental margin (Project OMEX). Although the OMEX data fit within the family of empirical models introduced by Platt and Harrison (1985) Nature 318, 55&amp;#x2013;58), it is shown that the discrepancy between experimental and fitted values is larger than expected, assuming that the data are accurate. Since the ambient ammonium concentration plays a leading role in regulating new production, the present analysis was extended to include explicitly the effect of ammonium on &lt;i&gt;f&lt;/i&gt;-ratio versus nitrate plots. Experimental results based on controlled ammonium additions...
Tipo: Info:eu-repo/semantics/article
Ano: 1999
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=10269

Nitrogen cycles in a coastal open sea zone off the Belgian coast
Provedor de dados: 27
Autores: Baeyens, J.; Goeyens, L.; Dehairs, F.A.; Decadt, G.; Mommaerts, J.-P.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coastal waters Nitrogen cycle ANE; Belgium; Belgian Coast.
Ano: 1983
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=10068

Phytoplankton nitrogen nutrition in the western Indian Ocean: Ecophysiological adaptations of neritic and oceanic assemblages to ammonium supply
Provedor de dados: 27
Autores: Mengesha, S.; Dehairs, F.A.; Elskens, M.; Goeyens, L.
The nitrogen nutrition of the phytoplankton community in the neritic and oceanic waters of the western Indian Ocean was investigated during the south-east monsoon (June-July) and intermonsoon periods (November-December). The region is very oligotrophic, characterized by very low nutrient concentrations (surface NO sub(3)&lt;0.5 µM), low phytoplankton biomass (PON similar to 0.85 µmoll super(- 1)) and predominance of regenerated production (maximum f -ratio &lt;0.47). Ammonium was the major nitrogen substrate during the two seasons, supplying 53-99% of the phytoplankton's nitrogen requirement. Nevertheless, both the uptake of nitrate and its relative contribution to total nitrogen removal (f -ratio) were significantly higher during the intermonsoon period...
Tipo: Info:eu-repo/semantics/article
Ano: 1999
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=1951

The behaviour of dissolved Ba in estuaries
Provedor de dados: 27
Autores: Coffey, M.; Dehairs, F.A.; Collette, O.; Luther, G.; Church, T.; Jickells, T.
Tipo: Info:eu-repo/semantics/article
Ano: 1997
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=10219

KERFIX, a time series station in the Southern Ocean: a presentation
Provedor de dados: 27
Autores: Jeandel, C.; Ruiz-Pino, E.; Gjata, E.; Poisson, A.; Brunet, C.; Charriaud, E.; Dehairs, F.A.; Delille, D.; Fiala, M.; Fravalo, C.; Miquel, J.C.; Park, Y.-H.; Pondaven, P.; Quéguiner, B.; Razouls, S.; Shauer, B.; Tréguer, P.
Tipo: Info:eu-repo/semantics/article
Ano: 1998
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=10249

The marine barite saturation state of the world's oceans
Provedor de dados: 27
Autores: Monnin, C.; Jeandel, C.; Cattaldo, T.; Dehairs, F.A.
This paper addresses the question of the eventual control of barium concentration in seawater by an equilibrium with barite. For this, we have used a new thermodynamic model to compute the barite saturation index of ocean waters, mainly from GEOSECS data. Our results show that equilibrium between barite and seawater is reached in a number of places: cold surface waters of the Southern Ocean, waters at intermediate depths (2000-3500 m) in the Pacific, deep waters (2000-3500 m) of the Gulf of Bengal. The only samples for which a slight barite supersaturation is found are the surface waters at GEOSECS station G89 in the Weddell Gyre. Besides these locations, the rest of the world's oceans is undersaturated, as was established by Church and Wolgemuth [Church,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aqueous solutions; Oceanography; Oceans; Saturation; Thermodynamics.
Ano: 1999
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=10260

Nitrogen uptake regime and phytoplankton community structure in the Atlantic and Indian sectors of the Southern Ocean
Provedor de dados: 27
Autores: Semeneh, M.; Dehairs, F.A.; Elskens, M.; Baumann, M.E.M.; Kopczynska, E.E.; Lancelot, C.; Goeyens, L.
Phytoplankton nitrogen uptake is studied in relation to the biomass and structure of phytoplankton community in the Atlantic and Indian sectors of the Southern Ocean. Two scenarios of seasonal evolution of uptake regime and phytoplankton community structure are described. The first scenario includes the Marginal Ice Zone areas of the Weddell Sea and adjacent areas where a predominantly nitrate based, diatom dominated assemblage, thriving in a stable water column at the beginning of the season was transformed into a mainly ammonium based, flagellate dominated assemblage, towards the end of the season. The change in phytoplankton community structure was caused by selective grazing by large grazers and reduced stability of the water column and the shift in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biogeochemical cycle Biomass Community composition Continental shelves Ice edge Nitrogen Pelagic environment Phytoplankton Size distribution Uptake PS; Southern Ocean PSE; Antarctic Ocean.
Ano: 1998
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=10255

Trace metals in the eastern part of the North Sea: 2. Flows of Cd, Cu, Hg, Pb and Zn through the coastal area
Provedor de dados: 27
Autores: Baeyens, W.F.J.; Gillain, G.; Ronday, F.; Dehairs, F.A.
The residual flow lines of the Belgian coast are more or less parallel to the coast except in the area where the northeasterly flowing watermass coming from the Channel encounters the southwesterly-oriented Scheldt outflow. The result is a residual hydrodynamical front with, at the northern side, a less saline estuarine watermass, and at the southern side a more saline marine watermass. From the steady-state salinity pattern, diffusion coefficients perpendicular to the residual flow were deduced; they ranged from 21 to 108 m².s&lt;sup&gt;-1&lt;/sup&gt;.The steady-state profiles of dissolved metals versus salinity indicate a dilution effect in the coastal-estuarine watermass and almost constant concentration in the marine watermass. Offshore fluxes of Cd,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coastal zone Trace metals ANE; North Sea.
Ano: 1987
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3156

Suspended barite as a tracer of biological activity in the Southern Ocean
Provedor de dados: 27
Autores: Dehairs, F.A.; Stroobants, N.; Goeyens, L.
Tipo: Info:eu-repo/semantics/article
Ano: 1991
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=10145

An automated method for the assessment of mercury adsorption rates on particulate suspended matter
Provedor de dados: 27
Autores: Baeyens, W.F.J.; Decadt, G.; Dehairs, F.A.; Goeyens, L.
A continuous filtration system connected to a mercury auto-analyzer has been constructed for obtaining mercury adsorption rates on particulate suspended matter. The capabilities of this device have been demonstrated by carrying out a series of experiments under controlled physicochemical parameter conditions on samples of the Scheldt estuary. Duplicate measurements showed coefficients of variation ranging from 1 to 6 %. Depending on the physico-chemical conditions, the initial adsorption rate per unit of dissolved mercury concentration varied between 1.2 and 8.1 x 10&lt;sup&gt;-2&lt;/sup&gt; mn&lt;sup&gt;-1&lt;/sup&gt;.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Adsorption; Mercury; Methodology; Particulates; Suspended matter.
Ano: 1982
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3413

Oxidation rate of organic carbon in the mesopelagic water column as traced by suspended barium-barite
Provedor de dados: 27
Autores: Dehairs, F.A.; Goeyens, L.
Tipo: Info:eu-repo/semantics/article
Ano: 1996
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=7108

Tight coupling between enrichment of iron and manganese in North Sea suspended matter and sedimentary redox processes: evidence for seasonal variability
Provedor de dados: 27
Autores: Dehairs, F.A.; Baeyens, W.F.J.; Van Gansbeke, D.
Suspended matter and sediments from the North Sea were analysed for Al, Fe and Mn. A seasonal variation of Mn and Fe over Al ratios is observed. For most of the year suspended matter is enriched in Mn and Fe relative to average soil composition. No enrichment, and even depletion, occurs during a short period of the year (April-May) coinciding with the occurrence of the spring phytoplankton bloom. Surface sediments from the Southern Bight show the inverse image, with Mn and Fe enrichment occurring only in April-May and no enrichment during the rest of the year. These observations suggest a tight coupling between: (1) the change of redox potential in surface sediments, as triggered by the advection of organic matter from the spring bloom; (2) the outflow of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ferromanganese oxides Iron compounds Manganese compounds Redox reactions Seasonal variations Sediment chemistry Suspended load ANE; North Sea.
Ano: 1989
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3010

Barite formation in the Southern Ocean water column
Provedor de dados: 27
Autores: Stroobants, N.; Dehairs, F.A.; Goeyens, L.; Vanderheijden, N.; Van Grieken, R.
The intensity of past biological activity can be correlated with the occurrence of suspended and sedimented barite (BaSO&lt;sub&gt;4&lt;/sub&gt;). To date, there is a lack of information on the processes controlling the production of pelagic barite. During the EPOS-2 cruise (November-December 1988), situated in the Scotia Sea-Weddell Sea Confluence, suspended water samples were taken for analysis of total Ba by inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and for scanning electron microscopy-electron microprobe (SEM-EMP).The vertical profiles of particulate barium generally show a Ba maximum between 200 and 500 m. SEM-EMP investigation on Scotia-Weddell Sea Confluence profiles provide a possible explanation for the origin of this...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Artemia.
Ano: 1992
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2865

Microlayer metal excesses in a coastal North Sea area: relative contribution of dry fall-out
Provedor de dados: 27
Autores: Dehairs, F.A.; Dedeurwaerder, H.; Decadt, G.; Baeyens, J.; Gillain, G.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: ANE; North Sea.
Ano: 1983
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=10067

Determination of barium in sea water by cation-exchange separation and electrothermal atomic absorption spectrometry
Provedor de dados: 27
Autores: Dehairs, F.A.; Hoenig, M.; De Bondt, M.; Baeyens, J.; Van Den Winkel, P.
A method is described for the routine determination of barium in sea water by graphite-furnace atomic absorption spectrometry. Barium is separated from the main seawater cations by collection on a cation-exchange resin. The barium is extracted into nitric acid from a portion of the resin for injection into the pyrolytically-coated graphite furnace. The method is satisfactory for the low µg l&lt;sup&gt;-1&lt;/sup&gt; levels of barium present in ocean water, with recoveries more or equal to 99% and a relative standard deviation of &lt;5%.
Tipo: Info:eu-repo/semantics/article
Ano: 1987
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3168

Ammonium regeneration in the Scotia-Weddell Confluence area during spring 1988
Provedor de dados: 27
Autores: Goeyens, L.; Tréguer, P.; Lancelot, C.; Mathot, S.; Becquevort, S.; Morvan, J.; Dehairs, F.A.; Baeyens, W.F.J.
Tipo: Info:eu-repo/semantics/article
Ano: 1991
URL: http://www.vliz.be/imisdocs/publications/279128.pdf

Estimates of dry and wet deposition and resuspension fluxes of several trace metals in the Southern Bight of the North Sea
Provedor de dados: 27
Autores: Dedeurwaerder, H.L.; Dehairs, F.A.; Decadt, G.; Baeyens, W.F.J.
In this study we have investigated air-sea exchanges in the Belgian coastal area located in the Southern Bight of the North Sea. Since 1980 the tropospheric aerosol contents for the trace elements Cd, Cu, Mn, Pb, Zn and for the reference elements Al , Fe, Na have been monitored on an intermittent basis from a maritime sampling platform (Light-Vessel West-Hinder; position: 51°23.5'N- 2°21.5'E, fig. 1). During 1981 sampling campaigns at sea were paralleled by sampling campaigns on land, in the coastal area (natural reserve De Blankaert, located at 20 Km inland), in order to allow for a better evaluation of the specific source or sink role of the sea. No major source of pollution exists between the maritime and the continental sampling sites. During these...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aeolian deposits Resuspension Trace metals ANE; North Sea; Southern Bight.
Ano: 1984
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3323

Dynamic patterns of dissolved nitrogen in the Southern Bight of the North Sea
Provedor de dados: 27
Autores: Baeyens, W.F.J.; Mommaerts, J.-P.; Goeyens, L.; Dehairs, F.A.; Dedeurwaerder, H.; Decadt, G.
Spatial and temporal variations of dissolved inorganic nitrogen (DIN) have been assessed in onshore and offshore areas of the Southern Bight on the basis of several years' measurements. They indicate that both the residual flow lines and DIN isoconcentration lines run parallel with the coast except in the vicinity of important freshwater discharge points such as the Scheldt estuary. Evidence was found that the seasonal DIN oscillations are not created through fluctuations in input conditions at the lateral boundaries, despite considerable fluctuations in these inputs which include the English Channel (from 500 tons(t) N day&lt;sup&gt;-1&lt;/sup&gt; in June up to approximately 2000 t N day&lt;sup&gt;-1&lt;/sup&gt; in February) and also rivers such as the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dissolved organic nitrogen ANE; North Sea; Southern Bight.
Ano: 1984
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3310

Direct determination of dissolved barium in seawater by inductively coupled plasma / atomic emission spectrometry
Provedor de dados: 27
Autores: Dehairs, F.A.; Neybergh, H.; Hoenig, M.
Tipo: Info:eu-repo/semantics/article
Ano: 1989
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=10120

Distribution, transport and fate of Bi, Cu, Cd, Hg, Pb, Sb and Zn in the Belgian coastal marine environment. Part II: Spatial, temporal and compartmental distribution in the water column
Provedor de dados: 27
Autores: Decadt, G.; Gillain, G.; Dehairs, F.A.; Dedeurwaerder, H.; Goeyens, L.; Baeyens, J.
Tipo: Info:eu-repo/semantics/article
Ano: 1984
URL: http://www.vliz.be/imisdocs/publications/268322.pdf

Comparative study of different wet mineralisation digestion methods for the measurement of total mercury in biological samples
Provedor de dados: 27
Autores: Dehairs, F.A.; Decadt, G.; Baeyens, W.F.J.
Three botanical substrates and one milkpowder were mineralised and digested by the following methods in order to measure their total mercury content:  (1) HF/HNO&lt;sub&gt;3&lt;/sub&gt;-KMnO&lt;sub&gt;4&lt;/sub&gt;; (2) H&lt;sub&gt;2&lt;/sub&gt;SO&lt;sub&gt;4&lt;/sub&gt;/HNO&lt;sub&gt;3&lt;/sub&gt;-KMnO&lt;sub&gt;4&lt;/sub&gt;; (3) H&lt;sub&gt;2&lt;/sub&gt;SO&lt;sub&gt;4&lt;/sub&gt;/HNO&lt;sub&gt;3&lt;/sub&gt;- H&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;2&lt;/sub&gt;; (4) H&lt;sub&gt;2&lt;/sub&gt;SO&lt;sub&gt;4&lt;/sub&gt;/HNO&lt;sub&gt;3&lt;/sub&gt;-UV irradiation/KMnO&lt;sub&gt;4&lt;/sub&gt;; (5) H&lt;sub&gt;2&lt;/sub&gt;SO&lt;sub&gt;4&lt;/sub&gt;/HNO&lt;sub&gt;3&lt;/sub&gt;/V&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;5&lt;/sub&gt;-catalyst...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Digestion; Mercury; Nutrients (mineral).
Ano: 1982
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3380

Distribution, transport and fate of Bi, Cu, Cd, Hg, Pb, Sb and Zn in the Belgian coastal marine environment. Part V: Interaction kinetics between dissolved inorganic mercury and estuarine suspended matter
Provedor de dados: 27
Autores: Baeyens, W.F.J.; Decadt, G.; Dehairs, F.A.; Goeyens, L.; Dedeurwaerder, H.; Gillain, G.
Tipo: Info:eu-repo/semantics/article
Ano: 1982
URL: http://www.vliz.be/imisdocs/publications/286410.pdf