خيارات البحث
النتائج 1 - 10 من 49
Effects of the phenylurea herbicide isoproturon on periphytic diatom communities in freshwater indoor microcosms.
1996
Peres F. | Florin D. | Grollier T. | Feurtet Mazel A. | Coste M. | Ribeyre F. | Ricard M. | Boudou A.
Accumulation of aluminum and iron by bryophytes in streams affected by acid-mine drainage.
1996
Engleman C.J. Jr. | McDiffett W.F.
A survey of southern England coastal waters for the s-triazine antifouling compound Irgarol 1051.
1994
Gough M.A. | Fothergill J. | Hendrie J.D.
The mobility, partitioning and degradation of atrazine and simazine in the salt marsh environment.
1995
Meakins N.C. | Bubb J.M. | Lester J.N.
Overhauling health effects perspectives.
1988
Schwebach G.H. | Cafaro D. | Egan J. | Grimes M. | Michael G.
Immobilization of azo-dyes for optical detection of metal ions in water: reaction with Pd(II) [palladium]
2001
Savic, J. | Vasic, V. (Institut za nuklearne nauke "Vinca", Beograd (Yugoslavia). Laboratorija za fizicku hemiju)
The reaction of Pd(II) with 1,8-dihydroxy-2-(pyrazol-5-ylazo)-naphthalen-3,6-disulphonic acid immobilized by physical sorption onto Dowex 1-X8 ion-exchange resin was investigated with the aim to develop the sorption-spectroscopic test method for the detection of low Pd(II) concentrations in water. The resin phase absorption spectra of the reagent and its Pd(II) complex were followed. The immobilized reagent has the spectral characteristics similar to those in the water and forms with Pd(II) 1:1 complex with the absorption maximum at 650 nm. Parameters, such as pH, wavelength and contact time have been optimized for a given amount of the sorbed reagent. The experimental conditions for the linear dependence of absorbance vs. Pd(II) concentration have been determined.
اظهر المزيد [+] اقل [-]Adsorption of copper from water with wood sawdust in dynamic conditions
1999
Sciban, M. | Klasnja, M. (Univerzitet u Novom Sadu, Novi Sad (Yugoslavia). Tehnoloski fakultet)
In our previous papers, it is concluded that wood sawdust can be applied as adsorbent for heavy metals removing from water. All earlier investigations are done in batches, while it is confirmed that different heavy metals are adsorbing with various efficacy on sawdust of different kind of wood. Adsorption of copper ions from model water is investigated in this paper, by its passing throw column filled with poplar and fir sawdust, granulation in the range 0.5-1 mm. Starting concentration of copper ions was the same in all experiments, and flowrates of model water and column geometry are varied. Certain volumes of water are taken on the column outlet, and copper ions concentration are determinated in this samples. On the basis of these results breakthrough curves are obtained, and adsorption parameters in dynamic conditions are determinated.
اظهر المزيد [+] اقل [-]Distribution of dissolved organic matter in the waters of the Saguenay river with respect to nominal molecular mass [gel filtration chromatography]
1991
Leclerc, A. (Universite du Quebec, Chicoutimi (Canada). Departement des Sciences Fondamentales) | Levert, L. | Wang, F.
Growth, photosynthesis and UV-B absorbing compounds of Portuguese Barbela wheat exposed to ultraviolet-B radiation
1999
Correia, C.M. | Torres-Pereira, M.S. | Torres-Pereira, J.M.G. (Department of Biological and Environmental Engineering, University of Tras-os-Montes and Alto Douro, Apartado 202, 5000 Vila Real (Portugal))
Monitoring of nitrogen compounds on Yakushima Island, a world natural heritage site
1998
Satake, K. | Inoue, T. | Kasasaku, K. | Nagafuchi, O. | Nakano, T. (National Institute for Environmental Studies, Onogawa 16-2, Tsukuba, Ibaraki 305-0053 (Japan))
