SVIBOR - Project code: 1-07-147


Strossmayerov trg 4, HR - 10000 ZAGREB
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Project code: 1-07-147

Environmental pollution and processes at the solid-liquid interface

Main researcher: PRAVDIĆ, VELIMIR (38535)

Type of research: basic
Duration from: 01/01/91. to 02/28/95.

Papers on project (total): 57
Papers on project quoted in Current Contents: 12
Institution name: Institut "Ruđer Bošković", Zagreb (98)
Department/Institute: Center for Marine Research - Zagreb
Address: Bijenička 54, POB 1016, Zagreb, Hrvatska
City: 10000 - Zagreb, Croatia
Phone: 385 41-425-384

Summary: This project has had 3 intertwined parts: (i)theoretical, (ii)field work , and (iii) laboratory experimental work. All threeparts have been covered in producing results. 1. Theoreticalpart. Rational management of of natural resources of the sea andthe coastal regions is possible within the framework of ofseveral conceptual approaches. Authors subscribe to the conceptbased on the principle of environmental capacity, and theimplementation involving adaptive management. Several paperscover this theoretical approach, however reflecting originalfield work covered under (ii). 2. Field work consisted of theevaluation of results obtained in the Krka (šibenik) estuary.Direct field work, due to the conditions of war, was later ondirected towards the Raša river (Istria). This river, albeitsmall in terms of water throughput is an ideal natural modelsystem for a karstic estuary. Special attention was paid tostudies involving suspended mineral particles and sediments.Sampling was done by direct scuba-diving, the suspended materialwas obtained by centrifugation of large quantities (200 - 300dm3) of river or seawater. Mineral particles were analyzed on avariety of properties including mineral composition, organicmaterial concentration, specific surface area, ion exchangecapacity, electrical charge, viz. eletrophoretic mobility, and onthe concentration og heavy metals. All these data serve thepurpose of estimating the ability of of transfer of pollutantsfrom land to sea, and of their fate in the sea. 3.Laboratoryexperiments have served the purpose of studying the properties ofpure mineral materials, mostly clays, found in the compositesuspended material and sediments, originating in the source rocksof the region. Other laboratory work used metal oxides.Adsorption experiments served the purpose of establishing therelationship beteen bulk and surface properties. In that sensemuch work related to the electrokinetic properties of puremineral components in relation to the concentration of salt, pH,and the presence of humic acid.

Keywords: electrokinetic potential, surface charge, suspended matter, oxides, clays, clay minerals, surface properties, Raša river, Krka river, geochemical properties.

Research goals: The aim of the project was to clarify the role of suspended matter, and its deposition by flocculation, in determining the fate of pollutants in natural waters. A specific aim was to study the role of exchange of matter between the aquatic system and the solid phase, represented by suspended matter and sediments. The study of the dynamics of the natural aquatic system is essential in distiguishing between natural and anthropogenic influences. A final aim has been the analysis of discrete components of the processes and quantification of kinetic parameters.


  1. Name of project: JF 981 Suspensions and microstructure of ceramics
    Name of institution: Institut "Jožef Stefan"
    City: Ljubljana, Slovenija


  1. Name of institution: National Institute of Science and Tehchnology
    Type of institution: University/Faculty
    City: Washington, D.C., U.S.A.

  2. Name of institution: Geološki odjel, Prirodoslovno matematički fakultet, Sveučilište u Zagrebu

  3. Name of institution: Institut "Jožef Stefan"
    Type of institution: State institute
    Type of cooperation: Joint project
    City: Ljubljana, Slovenija

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Last update: 09/27/95