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Ecotoxicology and Environmental Safety

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https://www.readbyqxmd.com/read/30243211/measurement-of-volatile-organic-compounds-and-associated-risk-assessments-through-ingestion-and-dermal-routes-in-dongjiang-lake-china
#1
Fengmei Cao, Pan Qin, Shaoyong Lu, Qi He, Fengchang Wu, Hongwen Sun, Lei Wang, Linlin Li
This study aims to investigate the occurrence, distribution and risk assessment of volatile organic compounds (VOCs) in Dongjiang Lake of China. Twenty two kinds of VOCs were detected, and the major VOCs were alkene compounds. The total concentration of VOCs (∑VOCs) ranged from 2.93 to 4.69 µg/L, and none of the VOCs detected in Dongjiang Lake exceeded the concentration limits set in the National Drinking Water Quality Standards (GB5749-2006) or the National Environmental Quality Standards for Surface Water (GB3838-2002) of China...
September 19, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/30243045/simultaneous-biosorption-of-arsenic-iii-and-arsenic-v-application-of-multiple-response-optimizations
#2
Reza Tabaraki, Elham Heidarizadi
In this work, simultaneous biosorption of As(III) and As(V) by Sargassum glaucescens was optimized using multiple response optimizations and Doehlert experimental design. The optimum condition for simultaneous biosorption of As(III) and As(V) were: biosorbent dosage 0.47 g L-1 , pH 5.9 and initial concentration 120.34 mg L-1 with maximum overall desirability of 0.94. Different isotherms were fitted to biosorption equilibrium data and the Freundlich isotherm was the most suitable model. Based on thermodynamic study, the biosorption of arsenic species onto alga was endothermic and spontaneous...
September 19, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/30243044/acute-toxicity-of-organic-pesticides-to-daphnia-magna-is-unchanged-by-co-exposure-to-polystyrene-microplastics
#3
Alice A Horton, Martina G Vijver, Elma Lahive, David J Spurgeon, Claus Svendsen, Roel Heutink, Peter M van Bodegom, Jan Baas
Daphnia magna were exposed to two pesticides in the presence or absence of microplastics (300 000 particles ml-1 1 µm polystyrene spheres) and to microplastics alone. The pesticides were dimethoate, an organophosphate insecticide with a low log Kow, and deltamethrin, a pyrethroid insecticide with a high log Kow. Daphnia were exposed to a nominal concentration range of 0.15, 0.31, 0.63, 1.25, 2.5, 5 mg l-1 dimethoate and 0.016, 0.08, 0.4, 2, 5 and 10 µg l-1 deltamethrin. Exposure to polystyrene microplastics alone showed no effects on Daphnia magna survival and mobility over a 72 h exposure...
September 19, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/30241092/comparative-studies-on-growth-and-pb-ii-removal-from-aqueous-solution-by-nostoc-muscorum-and-anabaena-variabilis
#4
Mona M Abd El-Hameed, Mohamed E Abuarab, Shady Abdel Mottaleb, Reham M El-Bahbohy, Gomaa A Bakeer
Industrial wastewater containing heavy metals is a major environmental problem that needs to be treated. This study reported the ability of two fresh water algae cyanobacteria (Nostoc muscorum and Anabaena variabilis) to remove lead from aqueous solutions of four different initial concentrations (0-50 mg/L-1 ) for 21 days under controlled laboratory conditions. Results obtained in this study showed a maximum removal of Pb(II) (97.8%) by N. muscorum at 15 mg/L-1 initial metal concentration however the maximum removal by A...
September 18, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/30241091/effects-of-straw-leachates-from-cry1c-expressing-transgenic-rice-on-the-development-and-reproduction-of-daphnia-magna
#5
Yi Chen, Yanjie Gao, Haojun Zhu, Jörg Romeis, Yunhe Li, Yufa Peng, Xiuping Chen
The transgenic rice line T1C-19 provides high resistance to lepidopteran pests because of the synthesis of the Bacillus thuringiensis (Bt) insecticidal protein Cry1C. It thus shows good prospect for commercial planting in China. Species of Cladocera, an order of aquatic arthropods commonly found in aquatic ecosystems such as rice paddies, might be exposed to the insecticidal protein released from Bt-transgenic rice-straw residues. For the study reported herein, we used Daphnia magna (water flea) as a representative of Cladocera to evaluate whether aquatic arthropods are adversely affected when exposed to Bt rice-straw leachates...
September 18, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/30241090/protective-effects-of-farnesol-on-a-rhizobium-strain-exposed-to-cadmium
#6
Tiago Nunes, Paulo Cardoso, Rosa Freitas, Etelvina Figueira
Soil acts as a repository for many metals that human activity releases into the environment. Cadmium enters agricultural soils primarily from application of phosphate fertilizers and sewage sludge. Among soil bacteria, rhizobia have a great agronomic and environmental significance and are major contributors to a sustainable maintenance of soil fertility. However, the services that this group of microorganisms provides are affected by environmental constraints, such as Cd contamination. Bioactive compounds also influence soil microorganisms...
September 18, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/30241089/tolerance-mechanism-of-triarrhena-sacchariflora-maxim-nakai-seedlings-to-lead-and-cadmium-translocation-subcellular-distribution-chemical-forms-and-variations-in-leaf-ultrastructure
#7
Jian-Pan Xin, Yao Zhang, Ru-Nan Tian
Hydroponic experiments were conducted to assess the accumulation, translocation, and chemical forms of lead (Pb) and cadmium (Cd) in the roots, stems, and leaves of Triarrhena sacchariflora seedlings and the associated variation in leaf ultrastructure. The leaves and leaf ultrastructure showed no significant symptoms of toxicity with 0.05 mM Pb or 0.01 mM Cd exposure for 10d. Chlorosis and wilting were observed in leaves when the Pb and Cd concentration was higher than 0.1 and 0.05 mM in the medium, respectively, as demonstrated by severe ultrastructural modifications at higher concentration in the leaves, such as plasmolysis, cell wall detachment, chloroplast swelling, nuclear condensation, and even nuclear fragmentation...
September 18, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/30241088/the-impact-of-varying-abiotic-humification-conditions-and-the-resultant-structural-characteristics-on-the-copper-complexation-ability-of-synthetic-humic-like-acids-in-aquatic-environments
#8
Ting Yang, Mark E Hodson
Humic acid (HA) has a high complexation ability with metal ions due to its functional groups. In this study, 11 synthetic humic-like acids (SHLAs) were prepared under varying abiotic humification conditions: precursor species (glycine-catechol and glycine-catechol-glucose), precursor concentrations (from 0.25 M:0.25 M to 1 M:1 M), pH (6-8), temperature (25-45 °C) and mass of MnO2 catalyst (1.3-2.5% w/v). The effect of the varying humification conditions on the complexation ability of the SHLA for Cu2+ were investigated together with the relationships between Cu complexation ability and the structure of the SHLAs (elemental composition, type and content of functional groups, AL/AR, E4 /E6 )...
September 18, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/30240931/foliar-sprays-of-salicylic-acid-and-jasmonic-acid-stimulate-h-atpase-activity-of-tonoplast-nutrient-uptake-and-salt-tolerance-of-soybean
#9
Kazem Ghassemi-Golezani, Salar Farhangi-Abriz
This research was conducted as factorial on the basis of randomized complete block design with three replications to evaluate the effects of salicylic acid (1 mM SA), jasmonic acid (0.5 mM JA) and SA+JA on H+ -ATPase hydrolytic activity of tonoplast in soybean roots under 0, 4, 7 and 10 dS m-1 NaCl levels. The H+ -ATPase hydrolytic activity of tonoplast was increased under 4 dS m-1 , but with rising salinity up to 7 and 10 dS m-1 , the activity of H+ -ATPase and ATP content were decreased in root cells...
September 18, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/30240930/decolorization-and-detoxification-of-water-insoluble-sudan-dye-by-shewanella-putrefaciens-cn32-co-cultured-with-bacillus-circulans-bwl1061
#10
Weijie Liu, Yanting You, Di Sun, Shiwei Wang, Jingrong Zhu, Cong Liu
Effluents loaded with various synthetic dyes are considered as a huge burden to the surrounding ecosystems. Sudan dyes are relatively difficult to decolorize due to its water-insolubility. In the present study, the strain Shewanella putrefaciens CN32 was firstly applied to decolorize Sudan dyes under the anaerobic condition, and the physicochemical parameters on the decolorization were optimized. The results demonstrated that the suitable decolorization condition was temperature 26 °C, initial pH 7.0-8.0 and NaCl concentrations 0-20 g/L...
September 18, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/30240929/novel-high-gluten-flour-physically-cross-linked-graphene-oxide-composites-hydrothermal-fabrication-and-adsorption-properties-for-rare-earth-ions
#11
Xia Xu, Jiao Zou, Jie Teng, Qi Liu, Xin-Yu Jiang, Fei-Peng Jiao, Jin-Gang Yu, Xiao-Qing Chen
Graphene oxide (GO) nanosheets were immobilized and cross-linked by high-gluten flour (HGF), and a series of biomass-GO composites with various HGF-to-GO mass ratios were fabricated through a one-step hydrothermal method. The HGF-GO composites were used as novel adsorbents to adsorb rare earth ions (REE3+ : La3+ , Yb3+ , Y3+ , Er3+ and Nd3+ ) from aqueous solutions, and their adsorption properties were also investigated detailly. To evaluate the physicochemical properties of HGF-GO composites and further understand the mechanisms of adsorption of REE3+ onto HGF-GO composites, the HGF-GO composites were characterized by scanning electron microscopy (SEM), thermal gravimetric analyzer (TGA), Raman spectroscopy and Fourier transform infrared (FT-IR) spectroscopy...
September 18, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/30236922/the-antagonist-and-synergist-potential-of-cholinium-based-deep-eutectic-solvents
#12
Inês P E Macário, Sónia P M Ventura, Joana L Pereira, Ana M M Gonçalves, João A P Coutinho, Fernando J M Gonçalves
The design of environmentally friendlier solvents has gained increasing relevance in the last decade. Deep eutectic solvents (DES) have recently emerged, with advantages like low-cost and putative lower environmental impact. However, information about DES toxicity is still scarce. This work aims to contribute to profiling the ecotoxicity of DES based on cholinium chloride ([Chol]Cl). Six DES were addressed, combining [Chol]Cl (as hydrogen bond acceptor - HBA) with ethylene glycol, glycerol, 1,2-propanediol, propionic acid, 1-propanol, and urea as hydrogen bond donors (HBD), in different molar ratios...
September 17, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/30236921/distribution-and-transformation-of-lead-in-rice-plants-grown-in-contaminated-soil-amended-with-biochar-and-lime
#13
Honghong Li, Hao Xu, Shi Zhou, Yong Yu, Hailong Li, Cui Zhou, Yanhui Chen, Yunyun Li, Mingkuang Wang, Guo Wang
This study aimed to investigate the effects of rice straw biochar and lime (RBL) on the remediation of lead (Pb)-contaminated soil and mitigation of Pb translocation in rice plants by using pot experiments. Lead-contaminated soil collected from a farmland near a Pb-zinc (Zn) mine, biochar, limestone powder, and indica rice (Oryza sativa L.) were used in the present study. The experimental treatments included: (1) control (CK), (2) 2.5% biochar (RB1), (3) 5% biochar (RB2), (4) 0.6% lime (L1), (5) 1.2% lime (L2), (6) 2...
September 17, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/30236920/influence-of-potassium-concentration-gradient-on-stable-caesium-uptake-by-calla-palustris
#14
Dana Komínková, Kateřina Berchová-Bímová, Lucie Součková
The effect of potassium (K) concentration gradient on stable caesium (Cs) uptake by Calla palustris was studied under hydroponic conditions after eight-day exposure in a greenhouse experiment. The plants were exposed to two different concentrations of Cs (provided as 0.5 and 1 mM CsCl) and five different concentrations of K (provided as K2 SO4 in 0.5, 1, 2, 5, and 10 mM). The results indicate negative dependence of Cs uptake on K concentrations for both Cs treatments. The application of K reduced the transfer of stable Cs from water to plant by about 44-72% for 0...
September 17, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/30236919/variation-of-bacterioplankton-community-along-an-urban-river-impacted-by-touristic-city-with-a-focus-on-pathogen
#15
Sheng Liu, Chao Wang, Peifang Wang, Juan Chen, Xun Wang, Qiusheng Yuan
Bacterioplankton communities play a critical role in ecological processes in river systems, and shifts of their composition may impact microbial levels and raise public health concerns. The aim of this study was to comprehensively analyze the essential factors influencing bacterioplankton community, along with pathogen, and to estimate the health risk caused by the pathogens downstream of the Liushahe River, which is located in the famous touristic city Xishuangbanna. Results showed that wastewater treatment plants (WWTPs) and a subtropical recreational park impacted the bacterioplankton community and pathogen population, and potential pathogen identification demonstrated that 76 of 145 reference genera were present in the river...
September 17, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/30236918/earthworms-stimulate-nitrogen-transformation-in-an-acidic-soil-under-different-cd-contamination
#16
Hui-Juan Xu, Hao Chen, Xue-Li Wang, Yu-Long Zhang, Jin-Jin Wang, Ning Li, Yong-Tao Li
In acidic Cd-contaminated soils, soil nitrogen conversion is inhibited and usually block nitrogen supply for plants. Earthworms are well known for improving soil properties and regulating various soil biogeochemical processes including nitrogen cycling. To figure out the effect and mechanisms of earthworms on soil nitrogen transformation in Cd-contaminated soil, ten treatments with and without A. robustus in five soil Cd concentration gradients were established. The tolerant concentration of A. robustus to Cd in the acidic soil is about 6 mg kg-1 ...
September 17, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/30236917/multivariate-linear-regression-model-for-source-apportionment-and-health-risk-assessment-of-heavy-metals-from-different-environmental-media
#17
Yinxian Song, Huimin Li, Jizhou Li, Changping Mao, Junfeng Ji, Xuyin Yuan, Tianyuan Li, Godwin A Ayoko, Ray L Frost, Yuexing Feng
The study evaluated source apportionment of heavy metals in vegetable samples from the potential sources of fertilizer, water and soil samples collected along the Changjiang River delta in China. The results showed that 25.72% of vegetable samples (Brassica chinensis L.) containing Pb, and Cd, Cu, Hg and Zn at relatively serious levels were from soil. Combined with principle component analysis (PCA) and cluster analysis (CA), the results of the spatial distribution of heavy metals in different environmental media indicated that fertilizer, water and soil were the main sources of heavy metals in vegetables...
September 17, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/30223168/comparative-effects-of-nano-and-bulk-fe-3-o-4-on-the-growth-of-cucumber-cucumis-sativus
#18
Alexandre Konate, Yaoyao Wang, Xiao He, Muhammd Adeel, Peng Zhang, Yuhui Ma, Yayun Ding, Junzhe Zhang, Jie Yang, Simon Kizito, Yukui Rui, Zhiyong Zhang
Cucumber (Cucumis sativus) plants were cultivated in hydroponic media with nano and bulk- iron oxide (Fe3 O4 ) (50, 500 and 2000 mg/L) over a period of 21 days. At the low concentration (50 mg/L), nano-Fe3 O4 resulted in reduction of biomass and enzyme activities compared to the control. However, at the higher concentration of nano-Fe3 O4 dosage (2000 mg/L), there was a significant increase in biomass, antioxidant enzymes superoxide dismutase (SOD) and peroxidase (POD). In contrary, the high concentration of bulk-Fe3 O4 caused phytotoxicity in terms of biomass and enzymes activity...
September 14, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/30223167/spatial-distribution-accumulation-and-human-health-risk-assessment-of-heavy-metals-in-soil-and-groundwater-of-the-tano-basin-ghana
#19
Israel Doyi, David Essumang, Gustav Gbeddy, Samuel Dampare, Elliot Kumassah, David Saka
Soil serves as a vast matrix for heavy metal accumulation and subsequent redistribution to critical aspects of the environment such as groundwater. Soil pollution study is essential for sustainable human health and ecosystem protection. This study provides vital insight into the fate, accumulation, interactions, and health risk posed by heavy metals in soil and groundwater by employing geochemical accumulation index (Igeo), risk assessment models and multivariate data analysis techniques such as principal component analysis (PCA), preference ranking organisation method for enrichment evaluation (PROMETHEE) and geometrical analysis for interactive aid (GAIA)...
September 14, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/30223166/adsorptive-mercaptan-removal-of-liquid-phase-using-nanoporous-graphene-equilibrium-kinetic-study-and-dft-calculations
#20
Seyyed Salar Meshkat, Omid Tavakoli, Alimorad Rashidi, Mehdi D Esrafili
This research investigated the adsorption of tertiary butyl mercaptan (TBM) from liquid phases by using nanoporous graphene. Nanoporous graphene synthesized through chemical vapor deposition method was characterized using Brunauer-Emmett-Teller method, transmission electron microscopy, field-emission scanning microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy techniques. The TBM adsorption equilibrium was investigated by using Langmuir, Freundlich, and Tempkin models. The obtained results were in good agreement with the Freundlich isotherm...
September 14, 2018: Ecotoxicology and Environmental Safety
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