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221.
Marcilene Ferrari Barriquello N. Consolin-Filho E. R. Carvalho M. Y. Kamogawa L. Martin-Neto 《Environmental Chemistry Letters》2010,8(2):179-184
A polymer with characteristics similar to those of humic acids was obtained by synthesis reactions from oxidative polymerization
in an alkaline medium using para-benzoquinone, hydroquinone and 4-aminobenzoic acid as precursors. Samples of natural and synthetic humic acid were used to
examine the adsorption behavior of Cu2+ ions on these substrates. The mathematical models described by Langmuir and Freundlich equations were applied, yielding the
maximum adsorption intensity values K′ (Langmuir), maximum adsorption capacity, b (Langmuir) and the adsorbent adsorption capacity, m (Freundlich). Based on solubility studies, pH 3 was selected for the development of the adsorption experiment. The Cu2+ ion presented a favorable adsorption, with RL (equilibrium parameter) responses in Langmuir isotherms falling within the
desirable ranges. 相似文献
222.
Hudson Wallace Pereira Carvalho Ana P. L. Batista Peter Hammer Gustavo H. P. Luz Teodorico C. Ramalho 《Environmental Chemistry Letters》2010,8(4):343-348
Polysaccharide natural seed coat from the tree Magonia pubescens, in the form of hydrogel was used to remove metals in aqueous solution. Swelling tests indicate that seed coat presents hydrogel
behavior, with maximum water absorption of 292 g water/g. Adsorption experiments performed using Na+, Mg2+, K+, Ca2+, Cr3+, Fe3+ and Zn2+ demonstrated that the polysaccharide structure has a high capacity to extract these ions from the aqueous solution. Scanning
electron microscopy revealed significant morphological changes of the material before and after water contact. Differential
scanning calorimetry measurements indicate a signal shift of the water evaporation temperature in the material with adsorbed
zinc. X-ray photoelectron spectroscopy analysis combined with theoretical studies by the density functional theory and on
Hartree–Fock (HF) level evidence that the metallic ions were adsorbed through coordination with hydroxyl groups of polysaccharide.
In the case of Zn2+ the lowest HF energy was observed for the tetracoordination mode, where Zn2+ is coordinated by two hydroxyl groups and two water molecules. 相似文献
223.
In this work we have used fuzzy rule-based systems to elaborate a predator–prey type of model to study the interaction between aphids (preys) and ladybugs (predators) in citriculture, where the aphids are considered as transmitter agents of the Citrus Sudden Death (CSD). Simulations were performed and a graph was drawn to show the prey population, the potentiality of the predators, and a phase-plane. From this phase-plane, a classic model of the Holling–Tanner type is fitted and its parameters were found. Finally, we have studied the stability of the critical points of the Holling–Tanner model. 相似文献
224.
Villeneuve JP de Mora SJ Cattini C Carvalho FP 《Journal of environmental monitoring : JEM》2000,2(5):524-528
A sediment sample from the intertidal mudflats of the Tagus estuary was prepared, homogenised and distributed globally to laboratories as the IAEA-408 intercomparison material for the analyses of organochlorinated pesticides, PCBs and petroleum hydrocarbons (PHs). A total of 48 laboratories from 36 countries reported their results. The data from participants show that there still remain some difficulties with the accurate determination of organic contaminants such as pesticides and polycyclic aromatic hydrocarbons (PAHs). More consistent interlaboratory results were obtained for PCBs congeners. The final results of this intercomparison exercise enable individual participants to assess their performance and, where necessary, to introduce appropriate modifications in their analytical procedures. Furthermore, as a series of statistical criteria was fulfilled for a number of compounds, the sample IAEA-408 can now be used as a reference material for quality control in the determination of some persistant organic pollutants (POPs) in marine sediment samples. 相似文献
225.
Luz Silvana Rivas Javier Afonso Alexandra Carvalho Fátima 《Environmental science and pollution research international》2021,28(15):18382-18391
Environmental Science and Pollution Research - The winery wastewater (WW) of the Village of Vidigueira, in south of Portugal, presented an acid pH (4.26 ± 0.029), a high content of chemical... 相似文献
226.
Fernandes Tiago A. Mendo Sofia G. Ferreira Liliana P. Neng Nuno R. Oliveira M. Conceição Gil Adrià Carvalho Maria Deus Monteiro Olinda C. Nogueira José M. F. Calhorda Maria José 《Environmental science and pollution research international》2021,28(14):17228-17243
Environmental Science and Pollution Research - The increased use of pharmaceutical and personal care products (PPCPs) has contributed to the contamination of water systems and put pressure on the... 相似文献
227.
Baia Luana V. Luna Aderval S. Leito Juliana P. S Carvalho de Souza Wallace Figueiredo Marco A. G. Carvalho Ana P. 《Journal of Material Cycles and Waste Management》2022,24(2):606-617
Journal of Material Cycles and Waste Management - In this work, the synthesis of biochar from several biomass wastes to act as matrix for urea was investigated. The objective was to select the most... 相似文献
228.
de Souza Silva Gabriela Muricy de Carvalho Batista Muniz Izabella Veloso Cristiane Martins Santos Leandro Soares de Melo Neto Biano Alves Bonomo Renata Cristina Ferreira 《Journal of Polymers and the Environment》2022,30(1):246-257
Journal of Polymers and the Environment - Starch is the main predominant food reserve in plants. Its characteristics stand out from other carbohydrates providing it with several industrial... 相似文献
229.
Bromilow RH de Carvalho RF Evans AA Nicholls PH 《Journal of environmental science and health. Part. B》2006,41(1):1-16
The distribution of eight pesticides between sediment and water held in 1-m square outdoor stainless-steel mesocosms was studied, simulating both spring and autumn applications. Pesticide behavior was largely independent of rate of application, chosen in the first three experiments to be 4% or 40% of the normal field rate so as to simulate spray drift or partial overspray. Following application by spray to the water surface, all compounds were uniformly distributed in the 30 cm of overlying water within 24 h. The lipophilic pesticides (chlorpyrifos, pendimethalin, and permethrin) moved into the sediment within 30 d but with little penetration below 2.5 cm depth, and only chlorpyrifos persisted beyond 30 d. The mass balance of these lipophilic pesticides at 1 d was only 26.3% to 61%, with these initial losses attributed to processes such as volatilization. Isoproturon and chlorotoluron persisted for around 120 d, remaining largely in the overlying water with a maximum of 15% in the sediment. Permethrin and difenoconazole were much less persistent in these mesocosms, with very little ever found in the sediment in contrast to previous findings in laboratory-scale stirred systems as used in registration tests. The polar mecoprop remained almost entirely in the water phase and was rapidly degraded. Two further experiments examined also the influence of the submerged plant Lagarosiphon major in the mesocosms, the first experiment simulating a full-rate overspray with chlorpyrifos and linuron and the second a repeat in spring of the earlier main autumn experiment. Both chlorpyrifos and linuron applied in the autumn were quite persistent over the winter period, with about 20% still remaining after 152 d. Uptake into L. major was correlated with pesticide lipophilicity, but was only a small factor compared to uptake by sediment and degradation in these lightly vegetated systems. 相似文献
230.
Carvalho C Anjos RM Mosquera B Macario K Veiga R 《Journal of environmental radioactivity》2006,86(2):241-250
The accumulation and long-term decline of radiocesium contamination in tropical plant species was studied through measurements of gamma-ray spectra from pomegranate (Punica granatum) and chili pepper (Capsicum fructescens) trees. The plants were originally grown at a (137)Cs contaminated site (where a radiological accident occurred in the city of Goiania, Brazil, in 1987), and transplanted to uncontaminated soil, so that the main source of contamination of the new leaves and fruits would be the fraction of the available radiocesium in the body of the plants. Measurements of (137)Cs and (40)K concentrations along the roots, main trunk, twigs, leaves and fruits before and after the transplant process of both plant species indicated a direct competition between Cs and K ions, suggesting that these elements could have a common accumulation mechanism. Cesium transfer factors from soil to pomegranate, green and red chili pepper fruits were evaluated as 0.4 +/- 0.1, 0.06 +/- 0.01 and 0.05 +/- 0.01, respectively. Biological half-life values due to (137)Cs translocation from the tree reservoir (BHL(T)) were calculated as 0.30 years for pomegranate, 0.12 years and 0.07 years for red and green peppers, respectively. 相似文献