خيارات البحث
النتائج 751 - 760 من 783
Application of DEP method for estimating biomass of pelagic resources in bioecologicaly [i.e. bioecologically] conditions of Montenegrin coast 2008 | Primjena DEP metode za procjenu biomase male plave ribe u bioekoloskim uslovima crnogorskog primorja 2008 godine
2009
Mandic, M. | Pesic, A. | Djurovic, M. | Mandic, S. | Joksimovic, A., Institut za biologiju mora, Kotor (Montenegro)
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.
اظهر المزيد [+] اقل [-]Cu and Cd adsorption on river sediment | Adsorpcija Cu i Cd na recnom sedimentu
2009
Colic, J., Institut za vodoprivredu Jaroslav Cerni, Beograd (Serbia) | Petkovic, A., Institut za vodoprivredu Jaroslav Cerni, Beograd (Serbia)
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.
اظهر المزيد [+] اقل [-]Water quality assessment of the Tatarnica canal [Serbia] | Ocena kvaliteta vode vodotoka Tatarnica [Srbija]
2009
Savic, R. | Belic, A. | Josimov-Dundjerski, J. | Zdravic, M., Poljoprivredni fakultet, Novi Sad (Serbia). Departman za uredjenje voda
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.
اظهر المزيد [+] اقل [-]Water quality analysis of the Bocac reservoir based on the composition and dynamics of phyto and zooplankton, examinations for year 2008 | Kvalitet vode akumulacije Bocac na osnovu sastava i dinamike fito- i zooplanktona, istrazivanja za 2008. god.
2009
Zaric, I. | Mitrovic, P., Institut za vode d.o.o., Bijeljina, Republika Srpska (Bosnia and Herzegovina)
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.
اظهر المزيد [+] اقل [-]Water quality analysis of Zelengora [Bosnia and Herzegovina] natural lakes based on the composition and number of phyto and zooplankton, examinations for year 2008 | Analiza kvaliteta vode prirodnih jezera na Zelengori [Bosna i Hercegovina] na osnovu sastava i brojnosti fito- i zooplanktona, istrazivaja za 2008. godinu
2009
Zaric, I. | Bobic, M. | Mitrovic, P., Institut za vode d.o.o., Bijeljina, Republika Srpska (Bosnia and Herzegovina)
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.
اظهر المزيد [+] اقل [-]Phytoplankton as indicator of water quality of reservoir Barje [Serbia] | Fitoplankton kao pokazatelj kvaliteta vode akumulacije Barje [Srbija]
2009
Rankovic, B., Prirodno-matematicki fakultet, Kragujevac (Serbia). Institut za biologiju i ekologiju | Simic, S., Prirodno-matematicki fakultet, Kragujevac (Serbia). Institut za biologiju i ekologiju
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.
اظهر المزيد [+] اقل [-]Design of an index of ecological status for the Serbian sector - macroinvertebrates | Izrada indeksa ekoloskog statusa za podrucje Srbije - makroinvertebrati
2009
Tubic, B. | Atanackovic, A. | Djikanovic, V., Institut za bioloska istrazivanja Sinisa Stankovic, Beograd (Serbia) | Gacic, Z., Univerzitet u Beogradu, Beograd (Serbia). Centar za multidisciplinarne studije | Simic, V. | Petrovic, A., Univerzitet u Kragujevcu, Kragujevac (Serbia). Prirodno-matematicki fakultet | Paunovic, M., Institut za bioloska istrazivanja Sinisa Stankovic, Beograd (Serbia)
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.
اظهر المزيد [+] اقل [-]Water purification
2009
Gertsen, Nikolaj | Sønderby, Linus
Domestic and international regulations of concentration level of arsenic in drinking water taken from spring Sakinac (Avala) [Serbia] | Domaca i medjunarodna regulativa u pogledu sadrzaja arsena u vodi za pice na primeru izvora Sakinac (Avala) [Srbija]
2009
Poznanovic, M., Geoloski institut Republike Srbije Geoinstitut, Beograd (Serbia) | Popovic, Lj., Geoloski institut Republike Srbije Geoinstitut, Beograd (Serbia) | Manojlovic, D., Univerzitet u Beogradu, Beograd (Serbia). Hemijski fakultet
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.
اظهر المزيد [+] اقل [-]Sorption of arsenic on natural and modified materials | Uklanjanje arsena iz vode na prirodnim i modifikovanim sorbentima
2009
Jovanovic, B., Univerzitet u Beogradu, Beograd (Serbia). Gradjevinski fakultet | Rajakovic, Lj., Univerzitet u Beogradu, Beograd (Serbia). Tehnolosko-metalurski fakultet | Ljubisavljevic, D., Univerzitet u Beogradu, Beograd (Serbia). Gradjevinski fakultet
This study investigates removal efficiency of arsenic species from water on natural and modified sorbent materials. Selective removal of As(III) and As(V) from water was carried out with pure natural materials: bentonite, sepiolite, limonite, pyrolusite and zeolite. Materials most commonly used in water treatment, quartz sand and granular active carbon, were modified by iron coating in order to increase its sorption capacity. For the purpose of comparison, commercial material, granular ferry hydroxide (Everzit As), was investigated under the same conditions. The investigations were performed in batch experiments following the standard experimental methodology. Of all the tested natural materials zeolite exhibited significant sorption capacity: 100 microgram As(III, V)/g. Iron coating increased materials sorption capacity for at least 80%. Iron coated sand and iron coated activated carbon exhibited 340 and 430 microgram As(V)/g respectively.
اظهر المزيد [+] اقل [-]