In this work results from April to September 2009 are presented, which comprosed analyses of samples from 15 stations along Montenegrin coast. The main aim was to estimated level of eutrophication and phytoplankton community characteristic for eutrophic area. Maximum mean value of microplankton of 8.4 x 10**5 cells/l was noted in the inner part of Bokakotorska Bay. This area has maximal values throughout all period of investigation. It is result of waters dynamics and influence from the coast. In the open sea values were lower, about 10**4 cells/l. These results show that Montenegrin coast is an eutrophic region. Some phytoplankton organisms characteristic for eutrophic region were found also. The most abundant species was Thalassionema nitzschioides with maximum mean value of 8.4 x 10**5 cells/l.

Qualitative and quantitative phytoplankton analysis was determined using standard microscopic methods and high performance liquid chromatography (HPLC) in the Bay of Kotor, seasonally, from April 2008 to March 2009. Diatoms represents dominant group of microphytoplankton with maximum in spring period. Dinoflagellates reached maximum value in summer period, and followed by cyanobacteria bloom. Dominant biomarkers, fucoxanthin, alloxanthin, 19'-heksanoloksifukoxanthin, zeaxanthin and chlorophyll b, show a similar distribution as the appropriate phytoplankton assemblages during the researches in Kotor Bay.

Marine sediments are very important for transport, fate and influence of heavy metals in marine ecosystem and therefore they represent good indicator of its ecological status. A great attention has been given in the last two decades in the Mediterranean region to the determination of heavy metals concentration in marine sediments through the monitoring programs, as well as to the studies of heavy metals distribution and their effects on biota. This paper presents the concentrations of Cr, Ni, Cu, Cd, Pb, and Zn determined by EDPXRF method, in the surficial sediment samples taken from six location in the coastal region of the South East Adriatic and their distribution in the investigated area. It can be noticed the influence of the Bojana river regarding the content and distribution of selected heavy metals.

Quality of groundwater from aquifers used for water supply in the town of Zrenjanin, does not meet the drinking water quality requirements. Among the basic problems are the high content of natural organic matter and arsenic, but also sodium and boron. This paper presents one of possible alternative of technological solutions for drinking water preparation in Zrenjanin. Research has lasted three years. The paper presents a only an outline of the drinking water preparation processes.

In order to protect the natural resources used, it is necessary that plant production has such a concept that its influence with the optimization minimizes the required yield. For this purpose it is necessary to adjust the measures taken for the purpose of regulation of water-air regime, especially in the area where land reclamation is applied. The difficult task require harmonization of approaches that are often contradictory, therefore it is necessary to make preparations for the changes in the existing principles of the existing land reclamation practices. These changes reflect primary in the rational use of resources that could result in the protection and improvement of biodiversity and therefore stable ecosystem in the agricultural area.

The paper presents aquatic macroinvertebrate community at four investigated localities of the Gradac river. Sampling was carried out during 2003 and 2006. Community structure and composition, together with field data, were used to estimate the water quality status of the river. A total of 87 taxa have been recorded. Insects were found to be the most diverse component, especially Ephemeroptera. Insects were dominant in the regard of the quantitative structure of the community, as well. Recorded community indicates good water quality, ranged between oligosaprobic and beta-mesosaprobic status (1st-2nd class according national classification scheme).

During the summer 2009 physical, chemical, biochemical and bacteriological analyses of water of rivers Mušnica and Suški Potok were performed. Microbiological analysis point out that waters belong to the 2nd class by Kohl. The river Mušnica had slightly polluted water, and river Suški Potok had very slightly polluted water. According to the Regulation on Classification of Surface Waters in Republic of Srpska (Bosnia and Herzegivina) all the observed parameters belong to the first or second water quality class. Only the stream Suški Potok has chloride concentration that exceeds a third-class quality. On the basis of observed characteritics it can be concluded that Mušnica and Suški Potok have a satisfactory water quality.

Investigation of the echinoderms fauna in the benthic biocoenosis on the Montenegrin shelf is conducted during 2007. Total number of 50 species is identified and they are grouped into 5 classes. Specific conditions of the south Adriatic cause presence of eight termophilic species. Inside collected materials were eight Mediterranean endemics and two submediterramean endemic species. Diversity and quantity of the registered species depend of physical-chemical water conditions, bottom type as well as anthropogenic impact.

The paper gives the results of the analyses of ichthyoplankton assemblages and distribution in Boka Kotorska Bay during July of 2006. Investigation was conducted on 18 positions. Fifteen different species was determine in total. The relation between ichthyoplankton assemblages and abiotic and biotic environmental factors was analysed.

This study was performed to investigate the efficiency of Fenton's process (FP) for removing natural organic matter, in particular the main disinfection by-products precursors. In order to determine the optimal reaction conditions of the process, the influence of pH, mixing speed and reaction time were investigated, as well as the influence of initial concentration and the molar ratio of Fe2+ and H2O2. The best results in terms of reducing the DOC content (by 82%) were achieved under pH 5, 30 rpm, reaction time of 15 min, Fe2+ concentration of 0.25 mM and a molar ratio of 1:10, and in terms of reducing trihalomethane and haloacetic acid precursors (by 98-99%) under a Fe2+ and H2O2 molar ratio of 1:20.