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  • 1
    ISSN: 1573-5117
    Keywords: Scheldt estuary ; trace metals ; 1995 ; dissolved ; particulate ; biogeochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cu, Cd, Zn and Pb concentrations in both dissolved andparticulate phase were assessed during 1995. DataQuality Assurance was an integral part of this studyand involved all major steps of the analysis proceduresuch as sampling, sample handling, preconcentrationand determination. Desorption and redox processes clearly control thedissolved Cu and Cd profiles. Mobilisation ofdissolved Zn is small and essentially restricted tothe low salinity area and the late spring survey.Dissolved Pb shows the clearest dilution pattern. Theparameters representative of these processes(dissolved oxygen and salinity) also correlate verywell with the particulate metal profiles. In addition, the plankton activity (expressed by thechlorophyll-a levels) may influence the dissolved andparticulate metal profiles. In combination withdesorption and redox processes, seasonal variationswere induced.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-5117
    Keywords: Scheldt estuary ; trace metals ; 1981–1983 ; dissolved ; particulate ; biogeochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cu, Zn, Cd and Pb have been analysed in suspendedmatter and water samples from the Scheldt estuary,collected during five cruises between May 1982 and May1983. In order to evaluate the overall metal behaviourin the estuary, continuous longitudinal profiles ofthe total, the particulate and the dissolved metalconcentrations are discussed in relation to variousspecific physico-chemical parameters. By means ofcorrelation and multi-regression techniques, severalestuarine processes could be identified which dominateand/or control the behaviour of the individual tracemetals in three distinct areas of the Scheldt estuary. The behaviour of the four selected metals was foundto show some common features, but is besides this alsocharacterised by many individual and specificproperties. The total metal concentrations seem toco-vary well with the turbidity in the maximumturbidity zone between salinities 2 and 10 psu. In thedownstream area a dilution profile is observed for thetotal metal concentrations of Cu and Cd as well as forthe dissolved concentrations of all metals. Dissolved metal production rates are high for Cu andCd, but much lower for Zn and Pb, confirming thedifferent longitudinal dissolved metal profiles. ForCu and Cd these dissolved metal profiles arecharacterised by a broad mobilisation area, coveringthe whole middle estuary. Pb on the other hand, showsa more confined mobilisation area, and for Zn no sucharea was found. During winter the dissolved metalproduction rates seem to be controlled, predominantly,by desorption processes. During summer dissolved metalproduction is correlated mainly to the dissolvedoxygen content, suggesting the domination of redoxprocesses solely or in combination with desorptionprocesses. In some cases, co-existent with nearly zerooxygen concentrations, removal of dissolved metals wasobserved, possibly reflecting precipitation reactions. Longitudinal particulate metal profiles all show anegative deviation versus the dilution profile. Cu andCd provide the higher deviations, characterised by anarrow enrichment zone preceding a broad mobilisationarea. Finally, all particulate metal profiles appearedto correlate well with POC, when expressed involumetric units.
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  • 3
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    Uliège Library | Presses agronomiques de Gembloux (Liege University)
    Publication Date: 2024-04-14
    Description: Kan de landbouw van vandaag nog steeds de producent van gezonde en kwaliteitsvoeding zijn? Of moet men de voorkeur geven aan alternatieve systemen, zoals de korte ketens en de biologische landbouw? Welke toekomst heeft de locale landbouw? En welke richting gaat het uit op wereldschaal? Hebben GGO nog een rol van betekenis om de uitdagingen die ons wachten aan te vatten? Is onze veeteelt duurzaam? En hoe gaan we om met de problematiek van de broeikasgassen? Dit eerste werk, dat werd geschreven door wetenschappers die hoofdzakelijk actief zijn in de domeinen van de voeding en van het milieu, wil de lezer betrouwbare en wetenschappelijke informatie verschaffen waarmee hij een antwoord kan vinden op de vragen die hij zich stelt. Het wordt steeds moeilijker juiste en onvervormde informatie te vinden in een wereld waarin veel verschillende drukkingsgroepen hun eigen belangen verdedigen. Daarom is het nodig wat afstand te nemen en ernstig na te denken over de grote problemen of belangen van de samenleving. Landbouwsystemen & Maatschappelijke uitdagingen is het eerste deel van het verzameld werk Klavertjevier. Er gaan nog drie boekdelen over complementaire thema s volgen, namelijk de voeding, het milieu en de gezondheid. Naar het beeld van het klavertjevier, talisman en geluksklavertje, bevat het verzameld werk vier boekdelen, een voor elk blaadje van de talisman. Ze hebben elk hun belang en convergeren in één enkel ultiem objectief: het welzijn van het menselijk wezen in een gezonde omgeving, met voldoende kwaliteitsvoeding.
    Keywords: agriculture ; short circuits ; organic farming ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TV Agriculture and farming::TVG Organic farming ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TV Agriculture and farming ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TV Agriculture and farming::TVB Agricultural science
    Language: Dutch
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  • 4
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    Uliège Library | Presses agronomiques de Gembloux (Liege University)
    Publication Date: 2024-04-14
    Description: Can today's agriculture still fulfill the functions of producing healthy, quality food? Or should we favour alternative systems such as short circuits and organic farming? What future for local agriculture? Where are we heading on a global scale? Do GMOs still have a role to play in facing the challenges ahead? Are our breeding methods sustainable? How can we manage the problem of greenhouse gas emissions? This first book written by scientists working mainly in the field of food and the environment aims to provide readers with reliable information, based on scientific evidence, to help them find answers to important questions they may have. In a world where it is more and more difficult to find correct information, undistorted by the numerous pressure groups that each defend their own interests, it is good to be able to take a step back and start an in-depth reflection on some of these major problems or issues of society. "AgricultureS et enjeux de société" is the first volume of the "Le trèfle à quatre feuilles" collection. It will be followed by three other books on complementary themes such as Food, Environment and Health. In the image of the four-leaf clover, a good luck charm and symbol of good fortune, the collection includes four volumes, corresponding to the four leaves of our talisman. Each of them has its own importance and converges towards an ultimate goal: the well-being of human beings living in a healthy environment and eating quality products. / L'agriculture d'aujourd'hui permet-elle encore de remplir les fonctions de production d'aliments sains et de qualité ? Ou faut-il privilégier des systèmes alternatifs tels que les circuits courts et l'agriculture biologique ? Quel avenir pour l'agriculture locale ? Vers quoi se dirige-t-on à l'échelle mondiale ? Les OGM ont-ils encore un rôle à jouer pour pouvoir faire face aux défis qui nous attendent ? Nos méthodes d'élevage sont-elles durables ? Comment gérer la problématique d'émission de gaz à effet de serre ? Ce premier ouvrage rédigé par des scientifiques oeuvrant principalement dans le domaine de l'alimentation et de l'environnement a pour objectif d'apporter aux lecteurs des informations fiables, basées sur l'évidence scientifique, afin de les aider à trouver des réponses à des questions importantes qu'ils peuvent se poser. Dans un monde où il est de plus en plus difficile de trouver des informations correctes, non déformées par les nombreux groupes de pression qui chacun défendent leurs propres intérêts, il est bon de pouvoir prendre un peu de recul et entamer une réflexion en profondeur sur certains de ces grands problèmes ou enjeux de société. "AgricultureS et enjeux de société" constitue le premier tome de la collection "Le trèfle à quatre feuilles". Il sera suivi par trois autres ouvrages, portant sur des thématiques complémentaires que sont l'Alimentation, l'Environnement et la Santé. A l'image du trèfle à quatre feuilles, porte- bonheur et symbole de bonne fortune, la collection comprend donc quatre tomes, correspondant aux quatre folioles de notre talisman. Chacun d'entre eux a son importance et converge vers un objectif ultime : le bien-être de l'être humain vivant dans un environnement sain et se nourrissant de produits de qualité.
    Keywords: agriculture ; short circuits ; organic farming ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TV Agriculture and farming::TVG Organic farming ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TV Agriculture and farming ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TV Agriculture and farming::TVB Agricultural science
    Language: French
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