Environmental pollution and processes at the solid-liquid interface
Main researcher
: PRAVDIĆ, VELIMIR (38535) Assistants
BIŠĆAN, JASENKA (3826)
JURAČIĆ, MLADEN (19152)
KONRAD, ZDENKA (21986)
MUSANI, LJERKA (32821)
VDOVIĆ, NEDA (154942)
ERK, MARIJANA (900121)
SONDI, IVAN (179990)
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
Communication
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.
COOPERATION - PROJECTS
Name of project
: JF 981 Suspensions and microstructure of
ceramics Name of institution: Institut "Jožef Stefan" City: Ljubljana, Slovenija
COOPERATION - INSTITUTIONS
Name of institution
: National Institute of Science and
Tehchnology Type of institution: University/Faculty City: Washington, D.C., U.S.A.
Name of institution
: Geološki odjel, Prirodoslovno matematički
fakultet, Sveučilište u Zagrebu
Name of institution
: Institut "Jožef Stefan" Type of institution: State institute Type of cooperation: Joint project City: Ljubljana, Slovenija Other information about the project.