The content of major elements Al, K and Mg was investigated in surface sediment samples from the coastal area of the South-eastern Adriatic, in sediment fraction less than 2 mm. Obtained results were used to present horizontal spatial distribution of these elements in sediment of the area studied. The spatial distribution of elements showed similarities in the behavior of Al and K, while the distribution pattern of Mg in sediment was contrary to Al and K. It can be noticed that the sediment composition in terms of these elements reflects the geological characteristics of the continental hinterland in the South-eastern Adriatic coastal zone.

The fact is that in the world today water and land represents limited life resources which are more and more degrade and disturbed, mostly by anthropogenic influence. Especially water (seas, rivers, lakes) is exposed to various types of pollution. The fact is that in the world today water and land represented limited life resources which are more. That why in present time we conduct numerous scientific researches to examine, advance and protect our environment, especially water as a limited and delicate natural resource. In this work results from April to September 2011 are presented, which comprised analyses of samples from 8 stations in Boka Kotorska Bay. The main aim was to estimate trophic level, of determining the concentration of the physico-chemical parameters, chlorophyll a and TRIX index in Boka Kotorska Bay.

During the continuous analysis of zooplankton and hydrographic quality of sea in Boka Kotorska bay in season series during 2007/08, in addition to the other zooplanktons groups, fauna was analyzed, the appearance and abundance of Siphonophorae. Special attention was applied to biodiversity, dynamic abundance and distribution of group. In this paper we are exposing the data for abundance and distribution of group of Siphonophorae from Boka Kotorska Bay. We have found six species of which only the species Muggiaea cochi (W and l l) can be located throughout the year at all stations and in shallow stations only in summer. The other species Lensia conoidea (Keferstein et Ehlers), Lensia multicristata (Moser), Lensia subtilis (Chun), Lensia fowleri (Bigelow), Abylopsis tetragona (Otto) occur rarely in small numbers or in individual specimens.

This paper presents results of measuring the contents of certain bioindicators in samples of digestive gland and lung of mussels (Mytilus galloprovincialis). The results were obtained in the framework of the Program for monitoring ecological status in Montenegro from 2009 to 2011 year. Samples were collected from two locations: Kotor-Dobrota (wild mussels) and the site of Bijela (caged mussels). Dynamic of sampling was twice a year, in April and September. In order to estimate the spatial distribution and temporal trends of pollution the results were compared with analysis of biomarkers in the three localities in the Slovenian coastal waters (bays Piran, Koper and Strujan). Biomarker responses showed no differences between these positions in the southern and northern Adriatic.

The paper presents the results of different methods of sequential extraction of metal in sediment of the Great Backa canal in order to obtain data on the total, available and potentially available contents of heavy metals as well as risk assessment in aquatic systems. Based on the results of sequential extraction of metals was found that sediment does not have the risk to the environment in terms of Cr, Cu and Pb concentration while the contents of Ni, Zn and Cd sediment indicates a moderate risk. Results of sequantial extraction of metals indicate that the risk to the aquatic ecosystems decreases in risk assessment based on the pseudo total metal content in the sediment. Thus the results suggest that not all detected metals are bioavailable and that not only on the basis of total metal content of the actual risk may be overestimated.

The paper presents a comparison of measurements of selected organic pollutants in various water matrices, in order to assess the impact of the matrix on the accuracy of pollutant analysis. Selected compounds were from class of phenols (p-nitrophenol, 3,5-dichlorophenol)and organochlorine pesticides (isomers of hexachlorocyclohexane (HCH), heptachlor, aldrine, heptahloroepoxide, 4,4'-DDE, dieldrine, endrine, 4,4'-DDD, endrin aldehyde, 4,4'-DDT, endosulfan sulfate). Apart from distilled water and synthetic aqueous matrix (salt addition in distilled water according to DIN EN 12902 standard), natural matrix was also used in the analysis – surface water (River Danube in Novi Sad – DOC (dissolved organic carbon) 2-6 mg/l, suspended matter content 30 mg/l).

Constant and highly productive agricultural productivity in the last decades has a tightly connected to irrigation. It is necessary to monitor the irrigation water quality in order to prevent or mitigate negative consequences on yield, soil and irrigation equipment. Besides the major waterways, the detailed canal network has great potential as a water resource. Peculiarities of this kind of water resources require monitoring of water suitability. During a three-year period of research, water was sampled on some localities in Backa and Banat (Serbia). The results of the research indicate that the water quality does not meet the demands proposed by the classifications. This proves the fact that during the irrigation period, it is necessary to monitor the irrigation water quality.

The Djerdap 1 Hydropower Plant (Djerdap 1 HPP) was joint projects of Yugoslavia and Romania, based upon the principles of equal benefits. The primary functions of the Djerdap 1 HPP are to effectively utilize the available hydropower potential of the Danube and to provide a full navigational capability under any hydrologic conditions. The utilization of the hydropower potential was conditional upon the provision of a Riparian Land Protection System for the Djerdap 1 reservoir, and the timely prevention of any adverse impacts due to the alternation of the natural regime as a result of backwater. ongoing enhancement of the Riparian Land Protection System and study of the various impacts have enabled a continual backwater increase and a resulting increase in the output of high quality power, with no significant risk of adverse impacts.

In the 21 century drinking water of acceptable quality should be available to every person. Numerous investigations are on-going worldwide around the world, to develop innovative and cost attractive approaches for production of high quality drinking water. To allow application of new treatment technology in practice, pilot testing under field conditions are required. Groundwater used for drinking water productions in the Subotica municipalities (Serbia) contains elevated concentrations of arsenic, iron and ammonia, and therefore provided a good basis for continuation of research of UNESCO-IHE, the Netherlands Institute for Water Education, that has been developing innovative water treatment technologies specifically in the field of groundwater treatment and specifically arsenic removal. Objective of this project presented in this paper were to test under field conditions IHE ADART, the innovative adsorptive arsenic removal technology. The pilot project has demonstrated that in addition to conventional approach based on coagulation and break-point chlorination, there is and alternative treatment approach based on biological ammonia removal and adsorptive removal of arsenic that could be economically and ecologically attractive.