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Fig. 4. Spatial and seasonal dynamics of phosphorus forms in bottom sediments along river Dniester (2009).P13 – total phosphorus, P 14 – inorganic phosphorus, P 15 – organic phosphorus.Fig. 5. Percentage distribution of phosphorus forms in particulate materials (PM) and bottom sediments (BS) from river Dniester(Vadul-lui-Voda site). Phosphorus forms: Pinorg – inorganic phosphorus, Porg – organic phosphorus.nitrates, phosphorus, chlorophyl, oxygen etc. (otherparameters including bioindicators). Nevertheless, whichphosphorus forms should be considered for estimationof eutrophication level is questionable, e.g. according torecommendations [8] eutrophication level in rivers shouldbe estimated on the basis of total phosphorus content(form P1, Fig.1) while according to later recommendations[9] eutrophication level in rivers should be estimated on thebasis of soluble reactive phosphorus (form P5, Fig. 1).Obtained data for soluble reactive phosphorus (form P5)suggest that researched sector of river Dniester should beattributed to mesotrophic level of eutrophication (0,02-0,1 mgP/L), while on the basis of data for total phosphorus content(form P1) should be attributed to oligotrophic level of eutrophication(0,05-0,2 mg/L P). Unfortunately, quality grade ofphosphorus forms in bottom sediments there isn’t yet established,consequently at present is questionable to discussits influence onto eutrophication level of water bodies.ConclusionsThe scheme for determination of phosphorus forms inwater and particulate materials according to World HealthOrganization classification was evaluated. Additionally,this scheme was tested for estimation of phosphoruscontent in bottom sediments. The supplemented schemeallows the analysis of the phosphorus forms for theentirely system “water – particulate materials – bottomsediments”, and considerably extends possibilities forinterpretation of phosphorus dynamics in natural waters.References1. Directive 2006/11/EC of the European Parliament and theCouncil of the 15 th of February, 2006 on pollution caused by certaindangerous substances discharged into the aquatic environment of theCommunity.2. Madera V., Allen H.E., Minear R.A., (1982), Non-metallicConstituents, in: Examination of Water for Pollution Control, A ReferenceHandbook, M. J. Sues, World Health Organization, Regional Office forEurope, Copenhagen, Denmark (Eds.), 1st Edition, vol. 2, PergamonPress, Oxford-New York-Toronto-Sydney-Paris-Frankfurt.3. Rusu V., Postolachi L., Lupascu T. Phosphorus content inwater, particulate materials and sediments of river Prut. EnvironmentalEngineering and Management Journal. 2006, vol. 5, No. 4, p. 591-596.4. Postolachi L. Peculiarities of phosphorus dynamics in particulatematerials for lakes from Chisinau Researches in chemistry field, vol. II,Chisinau. -2003. -p. 196– 199 (Rom).5. Postolachi L., Rusu V., Lupascu T. Phosphorus forms inwater-particulate materials-bottom sediments system in river Dniester/Scientific Bulletin, series of Natural sciences, No. 2 (15), Chisinau,– 2005. p. 113-116 (Rom)6. Postolachi L., Rusu V., Lupascu T. Phosphorus forms in water,particulate materials, bottom sediments in river Dniester / Proc. Int.Conference “Integrated management of natural resources in thetransboundary Dniester river basin. September 16-17, 2004, p. 242-244(Rom)7. Directive 91/676/EEC of the European Parliament and theCouncil of the 12 th of December, 1991 concerning the protectionof waters against pollution caused by nitrates from agriculturalsources.8. “Nitrates” Directive 91/676/EEC. Status and trends of aquaticenvironment and agricultural practice. Development guide for MemberStates’ reports, ISBN 92-828-9379-0, 2000.9. Review of 2007-2010 Action Programme for the Nitrates Directive.Northern Ireland. Recommendations from the Scientific Working Group21 December 2009 -89p.— 194 —