The objective of the paper is establishing of eco-chemical characterization of the river system by investigating and distribution heavy metal content in the river sediments using sequential extraction and total digestion. Heavy metals toxicity and bioavailability in the Danube river sediment are defined according to their distribution between different phases. Sediments samples were taken from 9 sites and analysed for cadmium (Cd), iron (Fe), manganese (Mn), lead (Pb), copper (Cu), zinc (Zn) and chromium (Cr), and the results about cadmium and iron presented in this paper.

A monitoring program was organized with the aim of assessing the quality of sediment and water in Nadela canal regarding metal content (Cr, Cd, Cu, Ni, Pb, Zn, Hg). Water was the 1st/2nd class according to national requirements. The Canadian probable effect guideline value for sediment quality is occasionally or constantly exceeded for different metals. Mercury and zinc contents are in elevated concentrations and nickel shows a tendency for accumulation. The results obtained give a preliminary overview of watercourse imperilment.

One of the key issues related to the water quality in the Iron Gate reservoir is the pollution of the sediment. Sediment deposits retained in the Iron Gate reservoir originate from a wide river basin with more then 80 million inhabitants and highly developed municipal and industrial infrastructure. Besides mineral river sediment, various organic and inorganic matters entered and deposited within the Iron Gate reservoir. Sediment research objective was to assess the content of contaminants and nutrients which potentially could enter the water column.

During spring of 2005, referent monitoring of the chemical quality of surface waters and sediments in some protected areas in Vojvodina (Serbia) was conducted as a supplement to the Regular monitoring program. The aim of the study was to establish the chemical quality of surface waters and sediments regarding nutrient content. It is shown that the water quality satisfies the criteria of the 1st/2nd class according to our legislation, with the exception of the Ludos location, which showed a contamination with nitrogen matter in water and sediments. With regard to the contamination of water with phosphorus, almost all locations may be considered as potentially problematic.

The objective of this paper is establishing eco-chemical characterization of the Skadar lake (i.e. Lake Scutari) system by investigation of heavy metal content and distribution in the lake sediments. Factors that influence heavy metal concentrations in sediments are allochthonous (natural and human effects) and autochthonous (natural processes of settling and sorption) as well as transformation of settled substances in sediments. Sediments samples were taken from 15 sites and analysed for copper (Cu), zinc (Zn), cadmium (Cd) and lead (Pb).

During 2005 the referent monitoring of the chemical quality of surface waters and sediments in Vojvodina was conducted as a supplement to the regular monitoring program in Vojvodina. It is concluded that the water quality mainly satisfies the criteria of the 1st/2nd class acccording to our legislation, but regarding the more stringent Canadian and Dutch water quality standards content of some micropollutants may be considered as potentially problematic. Sediment quality is mainly satisfying, with the exceptions of the DTD canal Vrbas-Bezdan monitoring station after Srbobran, which showed a slight contamination with PAHs, and the Sava-Sabac monitoring station, as the target values according to Dutch legislation were exceeded for DDT and its metabolites.

During the spring of 2005, the chemical quality of surface waters and sediments in selected protected areas of Vojvodina (Serbia) was monitored, as a part of the Referent monitoring of the chemical quality of surface waters in Vojvodina during 2005 project. This work presents the results of the referent monitoring and establishes the chemical quality of the surface waters and sediments, and identifies particularly polluted and threatened areas. It is shown that in terms of organic micropollutants content, the chemical quality of the water in the protected areas is in most cases satisfactory, except in the protected areas of Carska Bara, at the Stari Begej Wharf site, and Lake Ludos, where higher mineral oils concentrations were detected. Furthermore, the toluene concentration in Lake Ludos exceeded Canadian guidelines.

The paper deals with quality of water and deposits in the Nadela stream (in Banat, Serbia). This stream is outline of regional multipurpose hydrosystem within the same name. Analyses are carried out according to water usability for irrigation and properties of settled sediments from stream bottom. Their potential influence, and effect of their application to surrounding arable soil were investigated.

Oil spill phenomena occur very often in the Boka Aquatorium. By studying the occurrence of oil stain on the sea surface the analyses of the Boka Bay pollution is represented in this document. Also represented is an evaluation or stimulation of expert opinion in a case of oil spill occurrence, in relation to the air temperature with the obvious consequences of carbon hydrogen appearance/presence.

Within the pollutant analysis in sediments the total organic carbon (TOC) content is determined, as well as nutrients such as nitrogen and phosphorus. In addition to this form carbon may be present as elemental or inorganic ones, as the crucial issue for sample preparation. Total phosphorus content was determined after sample digestion with sulphuric and perchloric acid. Organic nitrogen values were determined according the Kjeldahl method. Concentrations of TC, TOC, TIC, total P, organic N and total N in river Tisza sediment samples from sites Martonos, Novi Becej and Titel during 2004 and 2005 were presented.