Water quality in drainage canals system is under big influence of activities on surrounding agricultural land. In order to decrease transport and deposition part of plant protection chemicals and mineral fertilizers, vegetation belts with different shapes, characteristics and rules are possible to use. Besides the main purpose, this kind of belts are corridors for moving, but also place for living of wild plants and animals, what is increasing biodiversity. In that way, favourable conditions for organic agriculture in land reclamation area are possible to create.

Aquatic macrophytes are exceptional accumulations of heavy metals and they are very important in phytoremediation of the pollutants. The aim of the survey was to show according to content of heavy metals in aquatic macrophytes DTD (Danube-Tisza-Danube) canal complex, at localities under great human influence indicate the situation of chemical contamination these localities and to define test species, actually the ones that have the greatest accumulation. Plant material was prepared according to the Standard Methods for Examination of Water and Wastewater of the American Health Association. Analysis of heavy metals in the plant tissue samples was done by standard methods using atomic absorption spectrophotometry. The best accumulator of majority of heavy metals is Ceratophyllum demersum. The results show that mentioned species can be used for removal of heavy metals from water, what means that it has the ability of phytoremediation of pollutants.

Seasonal dynamics of plankton in DTD hydrosystem in Backa region (Serbia) was estimated during the period June 2002-March 2003. More irregular cycles of the phosphorus level and plankton activities in DTD canal network gradually downstream (Northern Western - Southern Eastern channel direction) was observed. The plankton group of total coliforms was developing in early spring in the period of beginning of vegetation season and in summer, when the phosphatases of pH 5 and pH 9 have the highest activities, in all DTD sectors. In the assessment of trophic condition of DTD canal network, sectors of canals were corresponded with bacteriological analyses and level of phosphatase enzyme activities.

In this study we analyzed the water quality of the Danube-Tisza-Danube (DTD) canal network (Serbia) in October of 2006. Selected number of microbiological parameters showing lowering of ecological potential was in accordance with quantitative plankton analyses and water phosphatase activity. Obviously, the high presence of coliform bacteria, diatoms indicating water high salinity (Cyclotella meneghiniana, Entomoneis paludosa) pointed to the considerable problems of canal water usage of the middle and southern irrigation/drainage DTD hydrosystem for agricultural watering purposes.

One of the biggest problems in drinking water treatment is the presence of a high natural organic matter (NOM) content in water resources. This paper presents the results of a study which aimed mainly to determine a combined coagulation and preozonization process application for trihalomethanes and haloacetic acids precursors content in ground water rich in natural organic matter.

Iron-related well-screen encrustation and aquifer biofouling has decreased the specific capacity of RB-7 well. This paper describes the role of iron-related bacteria in the encrustation process and relates their occurrence to chemical conditions in the well.

It is intended the build up of three automated measurement stations for continuous measurement of water quantity and quality parameters on the rivers Danube and Tisza: water level, temperature, pH, dissolved oxygen, conductivity, turbidity, ammonium ion concentration, nitrates concentration and chlorophyll a. The purpose of continuous measurement was to demonstrate the variability in time and space of the aquatic processes, as well as remote transfer of data to the centre. The large fluctuations of the data from discrete measurements illustrated the importance of continuous measurements for the complete description and modelling of the biological processes in the river.

Arsenic is very toxic element and great pollutants in the environment. In this work we determine the content of arsenic in sea water from different sampling points of Montenegrin coast (mouth of river Bojana, Valdanos, Bar port, earlier Bar, Platamuni, Tivat bay) in winter and spring period. The content of arsenic was determined by using hydride AAS technique (Perkin Elmer, model 3300). The results were compared with the literature data and standard reference materials (Sea water CASS-1 National Research Council Canada-NRCC).

Influence of eutrophication to the phytoplankton community were studied in the inner part of Boka Kotorska Bay (Kotor Bay and Risan Bay) from September 2003 to August 2004. Kotor Bay and Risan Bay is very interesting area because the influence of natural and anthropogenic eutrophication are mixed very often. Microphytoplankton density is high (greater than 10**6 cells/cubic dm) what is characteristic eutrophic area, to the highest eutrophic area (greater than 10**7 cells/cubic dm). These values we stated in the surface, because in this layer were the best conditions. In same time we stated very high values: SiO2, oxygen saturation and chlorophyll a. The conclusion is: Boka Kotorska Bay and especially Kotor Bay (as a part of Boka Kotorska) has to be protected of dangerous consequences such as blooming. It is needed to regulate wastewater, their purification and permanent control physico-chemical and biological parameters, and especially phytoplankton component.

Quality of irrigation water taken from three wells located at Rimski Sancevi near Novi Sad, Serbia, has been monitored for three years. The obtained results showed that the samples from the three wells had a relatively uniform quality. We are dealing with a mineralized water which may increase the salinity of poorly drained soil but it cannot cause soil alkalization because of low sodium levels. In view of the above, it is recommended to periodically check not only irrigation water quality but also soil salinity level.