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Bianco Graciela Eugenia Suarez Eva Cazon Lauro de la Puente Teresita Beatriz Ahrendts Marcelo Rafael Benitez De Luca Julio César 《Environmental science and pollution research international》2017,24(26):21146-21152
Environmental Science and Pollution Research - Little is known about biosecurity measures and toxic effects during pesticide application in the province of Jujuy, Argentina, particularly concerning... 相似文献
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García-Leoz Vanessa Villegas Juan Camilo Suescún Diego Flórez Claudia P. Merino-Martín Luis Betancur Teresita León Juan Diego 《Regional Environmental Change》2018,18(4):1117-1129
Regional Environmental Change - Vegetation actively affects different components of the water budget in multiple spatial and temporal scales. Changes in vegetation cover and structure—such as... 相似文献
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Brenda Borbón Mercedes Teresita Oropeza-Guzman Enric Brillas Ignasi Sirés 《Environmental science and pollution research international》2014,21(14):8573-8584
Dairy wastewater is characterized by a high content of hardly biodegradable dissolved, colloidal, and suspended organic matter. This work firstly investigates the performance of two individual electrochemical treatments, namely electrocoagulation (EC) and electro-oxidation (EO), in order to finally assess the mineralization ability of a sequential EC/EO process. EC with an Al anode was employed as a primary pretreatment for the conditioning of 800 mL of wastewater. A complete reduction of turbidity, as well as 90 and 81 % of chemical oxygen demand (COD) and total organic carbon (TOC) removal, respectively, were achieved after 120 min of EC at 9.09 mA cm?2. For EO, two kinds of dimensionally stable anodes (DSA) electrodes (Ti/IrO2-Ta2O5 and Ti/IrO2-SnO2–Sb2O5) were prepared by the Pechini method, obtaining homogeneous coatings with uniform composition and high roughness. The ·OH formed at the DSA surface from H2O oxidation were not detected by electron spin resonance. However, their indirect determination by means of H2O2 measurements revealed that Ti/IrO2-SnO2–Sb2O5 is able to produce partially physisorbed radicals. Since the characterization of the wastewater revealed the presence of indole derivatives, preliminary bulk electrolyses were done in ultrapure water containing 1 mM indole in sulfate and/or chloride media. The performance of EO with the Ti/IrO2-Ta2O5 anode was evaluated from the TOC removal and the UV/Vis absorbance decay. The mineralization was very poor in 0.05 M Na2SO4, whereas it increased considerably at a greater Cl? content, meaning that the oxidation mediated by electrogenerated species such as Cl2, HClO, and/or ClO? competes and even predominates over the ·OH-mediated oxidation. The EO treatment of EC-pretreated dairy wastewater allowed obtaining a global 98 % TOC removal, decreasing from 1,062 to <30 mg L?1. 相似文献
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Carlos Rosas Gerard Cuzon Cristina Pascual Gabriela Gaxiola Darwin Chay Nelda López Teresita Maldonado Pedro M. Domingues 《Marine Biology》2007,152(2):371-381
The present study was designed to evaluate the effect of a natural prey (the crab Callinectes sp.) and an artificial diet (pellet with squid paste and offered as a paste) on the survival and assimilation efficiency
of subadult octopuses with 486 g of initial live weight. In order to reach this goal, the effects of the type of diet on energetic
balance were assessed by recording ingestion rate (C), respiratory rate (R = R routine, R
rout + R apparent heat increment, R
AHI), ammonia production rate (U = U routine, U
rout + U post-prandial, U
PP) and biomass production (P) of Octopus maya during its growing process. Energy lost from faeces (H) was calculated as H=C−(U+R+P) and assimilated energy (As) as R + P. Octopuses fed an artificial diet had almost five times higher ingestion rate compared to that observed in octopuses fed
crab. However, growth rate and production (P) were high in octopuses fed crab in comparison to octopuses fed artificial diet. An inverse relation between faeces (H) and type of food was observed, indicating that animals lost 77% of the ingested energy when fed artificial diet and only
5% when fed crab. A higher assimilation and production efficiency were obtained in octopuses fed crab (P/As: 61%) than in animals fed the artificial diet (P/As: −5%). The routine O : N ratio for animals in fasting was 9.1 and 2.3 for octopuses being fed crabs and the artificial
diet, respectively. The post-alimentary O : N ratio was 3.6 and 2.2 for animals fed crabs and the artificial diet, respectively.
This indicates that animals fed on both diets rely almost exclusively on protein. Based on energy balance data, a value of
472 kJ week−1 kg−1 of live octopus was estimated as the energy needed to obtain a growth rate near 9 g day−1 (2.8% BW day−1) for O. maya subadults. The total crab biomass needed to obtain 1 kg of fed O. maya biomass was calculated. A comparison with other different energy balance measurements made in other octopus species indicates
that O. maya and Enteroctopus megalocyathus (Pérez et al. 2006) tend to be more efficient by channelling more ingested energy to biomass production (P = 69.5% of C) than O. vulgaris (P = 23% of C; Petza et al. 2006) or Paraledone charcoti (P = 4% of C; Daly and Peck 2000). 相似文献
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Elizabeth Teresita Romero-Guzmán Héctor Hernández-Mendoza Abraham Kuri-Cruz Lázaro Raymundo Reyes-Gutiérrez 《Chemistry and Ecology》2018,34(5):482-494
Rainy season is known to ease the transport of particulate matter whether they are microorganisms or inorganic compounds. Regardless of their origin, these particles have a great environmental importance through their influence on physical processes such as ice nucleation and cloud droplet formation. Pathogenic airborne microorganisms may also have public health consequences. In this paper, we analyse particles from rainwater which were collected in Teflon pipes and then filtered in 0.45-μm pore diameter cellulose filters from six environmental monitoring stations in the Metropolitan Zone of Toluca Valley, State of Mexico, Mexico, during June and September of 2009 rainy season. The particulate material was treated with nitric and hydrochloric acid in a microwave reactor to homogenise samples and to determine the polluting elements through inductively coupled plasma sector field mass spectrometry analyses. At the same time, blank filters were analysed by scanning electron microscopy followed by energy-dispersive X-ray spectroscopy to observe their morphology and to identify their chemical composition. The enrichment factor of the main metals was evaluated. 相似文献
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Elizabeth Teresita Romero-Guzmán Lázaro Raymundo Reyes-Gutiérrez Anabel Sandoval-Pérez 《Chemistry and Ecology》2013,29(6):574-588
Scanning electron microscopy with energy-dispersive spectroscopy has been used for both morphological and elemental chemistry analyses of atmospheric particles. This technique allows the in situ observation of individual aerosol particles in the sample chamber. Aerotransported particles were analysed from seven monitoring stations located in the Metropolitan Zone of Toluca Valley (MZTV). Several different morphologies were identified: aggregates, porous spheres, rough and smooth compact material. The elemental composition included C, Na, Mg, Al, Si, S, Cl, K, Mn, Ca, Ti, V, Cr, Fe, Ni, Cu, Zn and Ce. These are semiquantitative analyses considering the bulk sample or individual particles. It was possible to correlate or confirm some chemical associations such as C–S, Ca–S–O and Si–Al–O, probably due to the presence of compounds derived from incomplete combustion, building tailing materials and aluminosilicates of cortical origin. Bioaerosols such as pollen, spores, brochosomes and diatoms were identified in the zone; all these types of particles have a natural origin too. Several types of suspended particles were identified in the MZTV, they were from different sources (natural and anthropogenic) to which the population can be potentially exposed, and may cause harm in the short- and long-term, according to their chemical element composition and size. 相似文献
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