Objective
THIS RESEARCH FORMS PART OF A COOPERATIVE PROJECT WITH THE FOLLOWING LABORATORIES:
- SCK-CEN, MOL, BELGIUM
- UNIVERSITY OF NIJMEGEN.
THE OVERALL GOAL OF THE JOINT RESEARCH PROJECT IS TO RELATE THE CHEMICAL REACTIONS INVOLVED IN THE FORMATION OF ORGANO-ALUMINIUM COMPLEXES UNDER ACID CONDITIONS TO THEIR TOXIC EFFECTS ON THE PHYSIOLOGY OF AQUATIC ORGANISMS. FINALLY, THIS RESEARCH IS INTENDED TO PREDICT TOXIC EFFECTS ARISING FROM ACIDITY AND ALUMINIUM UNDER VARYING ENVIRONMENTAL CONDITIONS.
SPECIFICALLY, THIS PROJECT IS ADDRESSING THE FOLLOWING RESEARCH:
1.- IMPROVEMENT OF CHEMICAL MODEL SYSTEMS FOR AL-HS INTERACTION DEVELOPED ALREADY UNDER CONTRACT EV3V086500. PARAMETERS FOR AL COMPLEXATION BY SEVERAL HUMIC FRACTIONS WILL BE OBTAINED, AND THE GENERAL APPLICABILITY OF THE RESULTS ASSESSED. IN ORDER TO BE ABLE TO PREDICT H+ AL3+ EXCHANGE, AND TO TAKE IONIC STRENGTH INTO ACCOUNT, A POLYELECTROLYTE MODEL WILL BE CHOSEN (BACKES AND TIPPING 1986-7:). THE REQUIRED DATA WILL BE OBTAINED FROM POTENTIOMETRIC MEASUREMENTS ON ISOLATED HUMICS.
2.- THE FORMATION OF POLYMERIC HYDROLYSIS PRODUCTS OF AL WILL BE STUDIED USING KINETIC ANALYSIS METHODOLOGY DEVELOPED UNDER CONTRACT EV3V086500. WORK WILL BE DONE IN THE LABORATORY AND IN THE FIELD AND WILL INCLUDE MIXING EXPERIMENTS. EFFECTIVE SOLUBILITY PRODUCTS FOR POLYMERIC SPECIES WILL BE ESTIMATED. AS WELL AS ENABLING AL SPECIATION TO BE PREDICTED, THE FINDINGS SHOULD BE USEFUL IN PREDICTING THE REMOVAL OF SOLUBLE AL FROM WATERS.
3.- THE INTERACTION OF AL WITH NATURAL PARTICULATE MATTER WILL BE STUDIED BY EXPOSING PARTICLES FROM NATURAL WATERS AND SEDIMENTS TO VARYING CONCENTRATIONS OF AL AND ACID OR BASE, AND MEASURING CONCENTRATIONS OF SOLUBLE AL AND PH. POSSIBLE WAYS OF MODELLING THE INTERACTIONS WILL BE EXPLORED. THE FINDINGS WILL ALLOW THE ROLE OF PARTICLES IN AL SPECIATION TO BE ASSESSED AND WILL GIVE INFORMATION ABOUT THE CONTROL OF SOLUBLE AL CONCENTRATIONS.
FROM THESE STUDIES IT SHOULD BE POSSIBLE TO PRODUCE A QUANTITATIVE MODEL FOR AL SPECIATION IN ACID SURFACE WATERS THAT HAS BEEN VALIDATED BY FILED MEASUREMENTS. IT WILL THEN BE POSSIBLE TO PREDICT THE DISTRIBUTION OF AL AMONG THE VARIOUS POSSIBLE FORMS, GIVEN PH AND TOTAL CONCENTRATIONS OF AL, F, SO, HUMIC SUBSTANCES AND PARTICULATES.
AS WELL AS PROVIDING MUCH-NEEDED INFORMATION ON THE BEHAVIOUR OF AL IN NATURAL WATERS, THE RESULTS WILL BE USEFUL IN THE DESIGN AND INTERPRETATION OF PHYSIOLOGICAL EXPERIMENTS AND IN RELATING RESULTS OF WEATHERING STUDIES TO FIELD CONDITIONS.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- natural sciences chemical sciences inorganic chemistry post-transition metals
- medical and health sciences basic medicine physiology
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Coordinator
LA22 OLP AMBLESIDE
United Kingdom
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.