In the paper is presented the microbiological quality of groundwater of drinking water supply Strand which is important water source for the city of Novi Sad (Serbia). The examinations were carried out using high and low nutritive media. The count of physiological groups, that are relevant from the aspect of organic pollution and phosphatase activity were also monitored. The results indicate potential organical pollution and need for protection of the water supply Strand.

This paper presents the concentration of Pb, Cd, Zn, Cu and Ni in the surface sediment samples, determined by EDPXRF. Also, a horizontal distribution of these metals is given for seven investigated sites in the coastal sea of Montenegro, from the entrace to the Bokakotorska Bay to the mouth of the river Bojana. A trend of increase in the concentration of metals with the distance from the coast is noticed in the studied area. The possible causes of this distribution should be sought in the direction of movement of sea currents in the Adriatic Sea as well as the fate of suspended material after entering the river Bojana.

In the present paper it is presented application of Daily Egg Production Method (DEPM) to the anchovy (Engraulis encrasicolus L. 1758) stock in the open part of Montenegrin coast. This article is based on the research done within the frame of AdriaMed Project.

A batch adsorption test was conducted to examine the adsorption characteristics of cadmium and copper on bed sediments of the Sava river and its relation to the concentration of dissolved metals. The adsorption of ions were studied using equilibrium technique as a function of adsorbate concentration. The adsorption data, over the whole range of concentrations used, follow the Langmuir adsorption isotherm. Cu2+ and Cd2+ adsorption isotherms were measured on some sediment samples obtained from 3 different sites.

Water quality conditions of the Tatarnica canal are considered in this paper. Tatarnica is also the main canal of Begec drainage system, which is situated about twenty kilometers from Novi Sad on the west. Water quality of this canal is important, beside others, because its inflow into Danube is near Begecka Jama, which is representative of natural garden with special ecological asset. Results of investigation on this locality during three years are analyzed and presented. According the most relevant water quality parameters from predominant number of samples, water belongs to required category. Sometimes, a bad water quality are recognized, usually when organic pollution was appear, which influence higher value of BOD5.

In the scope of complex water quality analysis of the Bocac reservoir, as well as rivers which flow into and out of the Bocac reservoir (Vrbas, Crna Rijeka) during the period from May to September 2008, the contents and the dynamics of the phyto and zooplankton were analyzed as biological parameters. The qualitative contents of the phytoplankton includes 5 divisions of total 27 taxa from 16 species; the tributaries contain 30 taxa from 19 genuses. The zooplankton (Rotatoria, Cladocera and Copepoda) contain 22 taxa from 16 genuses; the tributaries contain 32 taxa from 19 genuses with huge dominance of the Rotatoria species. By saprobiological analysis, species of oligo and beta mezosaprobiological character previal.

Researches of the Zelengora natural lakes during 2008 were performed in Orlovacko, Kotlanicko and the Lake Donje Bare. Water quality analysis of natural lakes of Zelengora were based on preliminary examination of basic physical and chemical parameters, as well as microbiological parameters. In the scope of biological examinations, phytoplankton, zooplankton and benthic fauna were determined. Due to the lack of data on biodiversity of examined natural lakes and whole area of National park Sutjeska results obtained in this research could only represent the first step toward further examinations, as well as the nature and biodiversity preservation in the Republic of Srpska.

Barje reservoir, established by damming of Veternica river, 30 km upstream from Leskovac town (Serbia), was intended for water supply of communities of Leskovac and Lebane. From its final formation and attaining of maximal volume (1995), long-year investigations have performed, and they included morphometric, chemical and biological parameters (phytoplankton, zooplankton, benthic fauna and ichthiofauna). The results of these hydrobiological investigations have showed that the reservoir Barje is unstable. In according to recommendation for continual following of condition of Barje reservoir, investigations of phytoplankton were repeated in spring and autumn aspects in 2005, and quality of the water was determined on the base of algae. The results of saprobiotic investigations show that the type of water is oligo-beta saprobic, but dense populations of eutrophic species (Fragilaria crotonensis and Closterium aciculare) indicate on deterioration of trophic conditions in this reservoir.

The aim of this paper is to present the use data of aquatic macro-invertebrates community, beside abiotic parameters, to define typology and type of specific reference conditions and index of ecological status, to contribute to the establishment of the system of ecological status/potential of surface waters in Serbia. The investigation involves macroinvertebrates as biological elements that have been widely used in implementation of the Water Framework Directive.

Arsenic is inorganic spread out in nature. Toxicity of arsenic is different, depending on its form. However, current international and Serbian legislation in drinking water regulate maximum allowed concentration of 0.010 mg/l (of total arsenic), regardless of its form. Concentration of total arsenic in water of springs of mountain Avala (Serbia) is higher than 0.010 mg/l. This paper present determination of inorganic arsenic in drinking water of spring Sakinac (Avala), also determination which form is more represented, relation of As(III) and As(V) and implementation of legislation. We used stripping voltametry method and gain value of total arsenic-62.87 microgram/l, in which 3.97 microgram/l is As(III) and residue of 58.90 microgram/l is As(V). It is obvious that value of 62.87 microgram/l is higher than MAL, but the most abundant arsenic form is less toxic, so the question is whether the water from spring Sakinac can or cannot be used.