Leonard Osté

• Consultant at Aveco de Bondt, Holten, Netherlands

High-frequency monitoring of water quality in catchments brings along the challenge of post-processing large amounts of data. Moreover, monitoring stations are often remote and technical issues resulting in data gaps are common. Machine learning algorithms can be applied to fill these gaps, and to a certain extent, for predictions and interpretatio...

High-frequency monitoring of water quality in catchments brings along the challenge of post-processing large amounts of data. Moreover, monitoring stations are often remote and technical issues resulting in data gaps are common. Machine Learning algorithms can be applied to fill these gaps, and to a certain extent, for predictions and interpretatio...

Afleiding kwaliteitsnormen voor metalen en fosfaat in grond en bagger Achtergronden en overwegingen bij het Milieuhygiënisch Toetsingskader en de inbedding in de Regeling Bodemkwaliteit

Water Matters, december 2021, pp. 16-19 https://www.h2owaternetwerk.nl/water-matters/wm-dec21 Er komt een groeiend aantal chemische stoffen in ons milieu terecht, ook in het oppervlaktewater. Het wordt daarmee voor waterbeheerders steeds lasti ger om inzicht te krijgen in de effecten van al die stoffen, en die kennis vervol gens te relateren aan br...

Consideration of metal bioavailability and natural background concentrations in assessing compliance

Phosphorus (P) leaching from agriculture is a major driver of water eutrophication in downstream rivers and lakes. In drained lowland areas with intensive agriculture, a reduction in the fertilizer applications may be insufficient to improve the water quality in the short term as the P accumulated in the soil during decades of high fertilization ma...

Sinds de afronding van het eindrapport van de Nationale analyse waterkwaliteit hebben de waterschappen aanpassingen aangeleverd op de normen die zij stellen voor nutriënten en voor biologie. In dit addendum geeft het Planbureau voor de Leefomgeving aan wat de nieuwe, aangepaste normen betekenen voor de resultaten en conclusies in het eindrapport. V...

De Nationale analyse waterkwaliteit is een publicatie van het Planbureau voor de Leefomgeving en geeft inzicht in de voorgenomen waterkwaliteitsmaatregelen en de effecten hiervan op de doelen van de Kaderrichtlijn Water (KRW). De analyse is gebaseerd op gezamenlijk feitenonderzoek van het Rijk, waterbeheerders, provincies, maatschappelijke organisa...

In de notitie 'Nationale analyse waterkwaliteit; tussentijdse resultaten en conclusies' beschrijft het PBL de tussentijdse resultaten van de Nationale analyse waterkwaliteit, een onderdeel van de Delta-aanpak Waterkwaliteit. De Nationale analyse is een traject van joint fact finding, waarin wordt gewerkt aan een gemeenschappelijke kennisbasis. Deze...

There is a growing awareness in cities throughout the world that green and blue infrastructure can offer a wide range of ecosystem services to support a healthy urban environment. For example, landscape architects explore possibilities in their design of the urban landscape to use the potential of green elements for regulating air temperature, air...

Many agriculture-dominated lowland water systems worldwide suffer from eutrophication caused by high nutrient loads. Insight in the hydrochemical functioning of embanked polder catchments is highly relevant for improving the water quality in such areas or for reducing export loads to downstream water bodies. This paper introduces new insights in nu...

Exfiltration of anoxic Fe-rich groundwater into surface water and the concomitant oxidative precipitation of Fe are important processes controlling the transport of phosphate (PO4) from agricultural areas to aquatic systems. Here, we explored the relationship between solution composition, reaction kinetics, and the characteristics of the produced F...

Many agriculture-dominated lowland water systems worldwide suffer from eutrophication caused by high nutrient loads. Insight in the hydrochemical functioning of embanked polder catchments is highly relevant for improving the water quality in such areas. This paper introduces new insights in nutrient sources and transport processes in a low elevated...

Based on present criteria for spreading or reuse of dredged sediment on agricultural fields, it is possible that these fields will not fulfil the criteria set for agricultural use, now or in the future. In this research criteria are derived to guarantee agricultural use of the land. The impact of these criteria on the amount of dredged sediment to...

Bij de huidige normstelling is het mogelijk dat bij het toepassen of verspreiden van baggerspecie landbouwpercelen niet meer voldoen of in de toekomst gaan voldoen aan de criteria voor landbouwkundig gebruik. In dit onderzoek zijn nieuwe normen afgeleid waardoor landbouwkundig gebruik gewaarborgd wordt. Er is nagegaan wat de consequenties van de vo...

The chemical behaviour of metals is primarily governed by their retention and release reactions of solute with the soil matrix. Liming increased the soil pH, resulting in increased adsorption of Zn, Cu, and Cd in soils, which in consequence decreased the concentration of easily soluble Cd fraction in the soils and the uptake of this metal by wheat...

The advent of the Water Framework Directive and the introduction of the Water Act will place the focus of the assessment of aquatic systems on the quality of surface water. This raises the question of the extent to which aquatic sediments act as a source of pollution due to the release of substances. This study examines whether substances are relea...

Voor het nieuwe bodembeleid is een model ontwikkeld dat ingezet kan worden voor lokale besluitvorming over de verspreiding van licht verontreinigde bagger op de kant. Regelmatig baggeren is een noodzaak in Nederland. Verontreinigingen in de bagger zorgen daarbij voor een probleem. Waar moet de verontreinigde bagger heen? Momenteel wordt een verspre...

Dit rapport beschrijft een model voor het gedrag van toxische stoffen die in bodem gebracht worden door verspreiding van baggerspecie. Regelmatig baggeren is een noodzaak in Nederland. Verontreinigingen in de bagger zorgen daarbij voor een probleem. Waar moet de verontreinigde bagger heen? Momenteel wordt een verspreidingsbeleid gehanteerd dat geba...

In situ immobilization of heavy metals in contaminated soils is a technique to improve soil quality. Synthetic zeolites are potentially useful additives to bind heavy metals. This study selected the most effective zeolite in cadmium and zinc binding out of six synthetic zeolites (mordenite-type, faujasite-type, zeolite X, zeolite P, and two zeolite...

In situ immobilization of heavy metals in contaminated soils is a technique to improve soil quality. Synthetic zeolites are potentially useful additives to bind heavy metals. This study selected the most effective zeolite in cadmium and zinc binding out of six synthetic zeolites (mordenite‐type, faujasite‐type, zeolite X, zeolite P, and two zeolite...

Free metal ions in aqueous and terrestrial systems strongly influence bioavailability and toxicity. Most analytical techniques determine the total metal concentration, including the metal ions bound by dissolved organic matter. Ion activity can be measured with ion-specific electrodes (ISEs) for some metals, but an electrode for Zn is not commercia...

Organic matter is an important component of soil with regard to the binding of contaminants. Hence, the partitioning of organic matter influences the partitioning of soil contaminants. The partitioning of organic matter is, among other factors, influenced by the ionic composition and ionic strength of the soil solution. This study focuses on the be...

The free metal concentration in the soil solution is often considered a key parameter for metal uptake by and toxicity to soft-bodied soil organisms. The equilibrium partitioning theory, which assumes a relationship between the contaminant concentration in pore water and the contaminant concentration in the body tissue, can be used to describe upta...

Metal-contaminated soils are potentially harmful to plants, animals, and humans. Harmful effects are often related to the free-metal concentration in the soil solution. Immobilization is a potentially useful method to improve the quality of metal-contaminated soils by transforming free-metal ions into species that are less mobile and less toxic. Th...

Metal-contaminated soils are potentially harmful to plants, animals, and humans. Harmful effects are often related to the free-metal concentration in the soil solution, Immobilization is a potentially useful method to improve the quality of metal-contaminated soils by transforming free-metal ions into species that are less mobile and less toxic. Th...

The chemical behaviour of metals is primarily governed by their retention and release reactions of solute with the soil matrix. Liming increased the soil pH, resulting in increased adsorption of Zn, Cu, and Cd in soils, which in consequence decreased the concentration of easily soluble Cd fraction in the soils and the uptake of this metal by wheat...

Thesis (doctoral)--Wageningen Universiteit, 2001. "Stellingen" inserted. Includes bibliographical references.

Keywords: beringite, cadmium, DOC, DOM, earthworms, immobilization, leaching, lime, manganese oxides, metal binding, metal uptake, organic matter partitioning, pH, soil contamination, remediation, sorption, Swiss chard, zeolites, zinc.It is generally assumed that a decrease in metal concentration in the soil solution reduces metal leaching, and met...