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81.
Marques AP Oliveira RS Samardjieva KA Pissarra J Rangel AO Castro PM 《Chemosphere》2008,70(6):1002-1014
The effect of two different chelating agents [EDTA and EDDS (S,S-ethylenediaminedissucinic acid)] on Zn tissue accumulation in Solanum nigrum L. grown in a naturally contaminated soil was assessed. Under those conditions, the response of the plant to the inoculation with two different isolates of arbuscular mycorrhizal fungi (AMF)--Glomus claroideum and Glomus intraradices--was also studied. Plants grown in the local contaminated soil (Zn levels of 433mg kg(-1)) accumulated up to 1191mg kg(-1) of Zn in the roots, 3747mg kg(-1) in the stems and 3409mg kg(-1) in the leaves. S. nigrum plants grown in the same soil spiked with extra Zn (Zn levels of 964mg kg(-1)) accumulated up to 4735, 8267 and 7948mg Zn kg(-1) in the leaves, stems and roots, respectively. The addition of EDTA promoted an increase in the concentration of Zn accumulated by S. nigrum of up to 231% in the leaves, 93% in the stems and 81% in the roots, while EDDS application enhanced the accumulation in leaves, stems and roots up to 140, 124 and 104%, respectively. In the stems, the presence of Zn was predominantly detected in the cortex collenchyma cells, the starch sheath and the internal phloem and xylem parenchyma, and the addition of chelating agents did not seem to have an effect on the localisation of accumulation sites. The devise of a chelate-enhanced phytoextraction strategy, using chelating agents and AMF, is discussed. 相似文献
82.
Performance evaluation of a biotrickling filter treating a mixture of oxygenated VOCs during intermittent loading 总被引:1,自引:0,他引:1
Sempere F Gabaldón C Martínez-Soria V Marzal P Penya-roja JM Javier Álvarez-Hornos F 《Chemosphere》2008,73(9):1533-1539
Laboratory scale-studies on the biodegradation of a 1:1:1 weight mixture of three oxygenated volatile organic compounds (VOCs), ethanol, ethyl acetate, and methyl-ethyl ketone (MEK) in a biotrickling filter (BTF) were carried out using two identically sized columns, filled with different polypropylene rings. The performance of the BTFs was examined for a period of 10 months applying several operational strategies. Similar performance was obtained for both supports. Intermittent flow rate of trickling liquid was shown beneficial to improve the removal efficiency (RE). Continuous feeding of VOC resulted in an excessive accumulation of biomass so high pressure drop was developed in less than 20-30 d of operation. Intermittent VOC loading with night and weekend feed cut-off periods passing dry air, but without addition of water, was shown as a successful operational mode to control the thickness of the biofilm. In this case, operation at high inlet loads (ILs) was extended for more than 75 d maintaining high REs and low pressure drops. Outlet emission concentrations lower than 100 mg Cm(-3) were obtained for ILs up to 100 g Cm(-3)h(-1) working at 15s of empty bed residence time. The most easily biodegradable compounds ethanol and ethyl acetate were used primarily than MEK. After a 3-wk-starvation period, the system performance was almost restored since the first d of operation, being the removal of the less biodegradable compound, MEK, partially deteriorated. 相似文献
83.
Reddy KJ Kumar JR Narayana SL Ramachandraiah C Thriveni T Reddy AV 《Environmental monitoring and assessment》2007,124(1-3):309-320
N-ethyl-3-carbazolecarboxaldehyde-3-thio- semicarbazone (ECCT) as an new analytical reagent used for the development of a
highly sensitive extractive spectrophotometric method for the determination of copper(II). The ECCT forms a greenish-yellow
colored 1:1 (M:L) complex with copper(II) at pH 3.0, which is well extracted into n-butanol and shows maximum absorbance at
380nm. The color of the complex is stable for more than forty eight hours. The system obey Beer's law in the range 0.4–3.6
with 2.243 × 104lmol−1cm−1, 2.83 × 10-3μgcm−2 molar absorptivity and Sandell's sensitivity respectively. The regression coefficient is 0.412 with 0.99 correlation coefficient.
The precision and accuracy of the method was checked by finding the relative standard deviation (0.422%). This developed method
has been successfully employed for the determination of copper(II) in environmental and pharmaceutical samples. The method
is evaluated by analyzing samples from the bureau of analyzed samples (BCS 233, 266, 216/1, 207 and 179) and by inter comparison
of experimental values using AAS. 相似文献
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The Power of Innovation and Strategic Sustainability Positioning: A Survey of the Mining Sector in Brazil
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Luciana Aparecida Barbieri da Rosa Clandia Maffini Gomes Jordana Marques Kneipp Ana Paula Perlin 《环境质量管理》2015,25(2):47-62
This study investigates the relationship between the power of innovation and the sustainability strategies of companies involved in the minerals extraction sector in Brazil. The study included companies associated with the Brazilian Mining Institute, and it used research surveys to gather data. Analysis of the survey data revealed that companies with highly intensive characteristics in regard to innovation and environmental activities (environmental management activities) also display offensive, or proactive, strategies for pursuing sustainability. 相似文献
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Bigliardi Ana Paula Fernandes Caroline Lopes Feijo Pinto Edlaine Acosta dos Santos Marina Garcia Edariane Menestrino Baisch Paulo Roberto Martins Soares Maria Cristina Flores Muccillo-Baisch Ana Luíza da Silva Júnior Flavio Manoel Rodrigues 《Environmental science and pollution research international》2021,28(2):1409-1416
Environmental Science and Pollution Research - Coal extraction and processing generate environmental contamination, which has several negative impacts on human health. Hematological and biochemical... 相似文献
90.
Rossi Lucía Palacio Magdalena Villabrille Paula I. Rosso Janina A. 《Environmental science and pollution research international》2021,28(19):24112-24123
Environmental Science and Pollution Research - V-doped TiO2 materials (0.01, 0.05, 0.10, and 1.00 nominal atomic %) were synthesized by the sol-gel method and characterized by X-ray diffraction,... 相似文献