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Environmental Science & Technology

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https://www.readbyqxmd.com/read/29333858/mineral-and-base-catalyzed-hydrolysis-of-organophosphate-flame-retardants-a-potential-major-fate-controlling-sink-in-soil-and-aquatic-environments
#1
Yida Fang, Erin Kim, Timothy J Strathmann
The ubiquitous occurrence of organophosphate flame retardants (OPFRs) in aquatic and soil environments poses significant risks to human health and ecosystems. Here, we report on the hydrolysis of six OPFRs and three structural analogues in the absence and presence of metal (hydr)oxide minerals. Eight of the target compounds showed marked degradation in alkaline solutions (pH 9-12) with half-lives ranging from 0.02 - 170 d. Kinetics follow a second-order rate law with apparent rate constants for base-catalyzed hydrolysis (kB) ranging from 0...
January 15, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29328674/new-insights-on-ecosystem-mercury-cycling-revealed-by-stable-isotopes-of-mercury-in-water-flowing-from-a-headwater-peatland-catchment
#2
Glenn Woerndle, Martin Tsz-Ki Tsui, Stephen Sebestyen, Joel D Blum, Xiangping Nie, Randall K Kolka
Stable isotope compositions of mercury (Hg) were measured in the outlet stream and in soil cores at different landscape positions in a 9.7-ha boreal upland-peatland catchment in northern Minnesota. An acidic permanganate/persulfate digestion procedure was validated for water samples with high dissolved organic matter (DOM) concentrations and we verified the complete breakdown of DOM through Hg spike addition analysis. We report a relatively large variation in mass-dependent fractionation (δ202Hg; from -2.12 to -1...
January 12, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29328658/modelling-net-land-occupation-of-hydropower-reservoirs-in-norway-for-use-in-life-cycle-assessment
#3
Martin Dorber, Roel May, Francesca Verones
Increasing hydropower electricity production constitutes a unique opportunity to mitigate climate change impacts. However, hydropower also impacts aquatic and terrestrial biodiversity through freshwater habitat alteration, water quality degradation, and land use and land use change (LULUC). Today, no operational model exists that covers any of these cause-effect pathways within Life Cycle Assessment (LCA). This paper contributes to the assessment of LULUC impacts of hydropower electricity production in Norway in LCA...
January 12, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29328654/country-level-life-cycle-assessment-of-greenhouse-gas-emissions-from-liquefied-natural-gas-trade-for-electricity-generation
#4
Adebola S Kasumu, Vivian Li, James W Coleman, Jeanne Liendo, Sarah M Jordaan
In the determination of the net impact of Liquefied Natural Gas (LNG) on greenhouse gas emissions, Life Cycle Assessments (LCA) of electricity generation have yet to combine the effects of transport distances between exporting and importing countries, country-level infrastructure in importing countries, and the fuel sources displaced in importing countries. To address this, we conduct a LCA of electricity generated from LNG export from British Columbia, Canada with a three-step approach: (1) a review of viable electricity generation markets for LNG, (2) the development of results for greenhouse gas emissions that account for transport to importing nations as well as the infrastructure required for power generation and delivery, and (3) emissions displacement scenarios to test assumptions about what electricity is being displaced in the importing nation...
January 12, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29328652/trade-induced-atmospheric-mercury-deposition-over-china-and-implications-for-demand-side-controls
#5
Long Chen, Jing Meng, Sai Liang, Haoran Zhang, Wei Zhang, Maodian Liu, Yindong Tong, Huanhuan Wang, Wei Wang, Xuejun Wang, Jiong Shu
Mercury (Hg) is of global concern because of its adverse effects on humans and the environment. In addition to long-range atmospheric transport, Hg emissions can be geographically relocated through economic trade. Here, we investigate the effect of China's interregional trade on atmospheric Hg deposition over China, using an atmospheric transport model and multiregional input-output analysis. In general, total atmospheric Hg deposition over China is 408.8 Mg yr-1, and 32% of this is embodied in China's interregional trade, with the hotspots occurring over Gansu, Henan, Hebei, and Yunnan provinces...
January 12, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29328635/adsorption-and-molecular-fractionation-of-dissolved-organic-matter-on-iron-bearing-mineral-matrices-of-varying-crystallinity
#6
Elizabeth K Coward, Tsutomu Ohno, Alain F Plante
Iron (Fe)-bearing mineral phases contribute disproportionately to adsorption of soil organic matter (SOM), due to their elevated chemical reactivity and specific surface area (SSA). However, the spectrum of Fe solid-phase speciation present in oxidation-reduction-active soils challenges analysis of SOM-mineral interactions and may induce differential molecular fractionation of dissolved organic matter (DOM). This work used paired selective dissolution experiments and batch sorption of post-extraction residues to 1) quantify the contributions of Fe-bearing minerals of varying crystallinity to DOM sorption, and 2) characterize molecular fractionation using Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS)...
January 12, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29325415/recrystallization-of-manganite-%C3%AE-mnooh-and-implications-for-trace-element-cycling
#7
Tobias Hens, Joël Brugger, Susan Cumberland, Barbara Etschmann, Andrew J Frierdich
The recrystallization of Mn(III,IV) oxides is catalyzed by aqueous Mn(II) (Mn(II)aq) during (bio)geochemical Mn redox cycling. It is poorly understood how trace metals associated with Mn oxides (e.g., Ni) are cycled during such recrystallization. Here, we use X-ray absorption spectroscopy (XAS) to examine the speciation of Ni associated with manganite (γ-Mn(III)OOH) suspensions in the presence or absence of Mn(II)aq under variable pH conditions (pH 5.5 and 7.5). In a second set of experiments, we used a 62Ni isotope tracer to quantify the amount of dissolved Ni that exchanges with Ni incorporated in the manganite crystal structure during reactions in 1 mM Mn(II)aq and in Mn(II)-free solutions...
January 11, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29323886/bisphenol-f-disrupts-thyroid-hormone-signaling-and-postembryonic-development-in-xenopus-laevis
#8
Min Zhu, Xiaoying Chen, Yuanyuan Li, Nuoya Yin, Francesco Faiola, Zhanfen Qin, Wuji Wei
The safety of bisphenol A (BPA) alternatives has attracted much attention due to their wide use. In this study, we investigated the effects of bisphenol F (BPF), an alternative to BPA, on thyroid hormone (TH) signaling and postembryonic development in vertebrates using T3-induced and spontaneous Xenopus metamorphosis as models. We found that in the T3-induced metamorphosis assay, higher concentrations of BPF (100-10000 nM) antagonized T3-induced TH-response gene transcription and morphological changes including intestinal remodeling in a concentration-dependent manner, whereas 10 nM BPF exerted stimulatory effects on T3-induced integral metamorphosis when inhibited T3-induced TH-response gene transcription, demonstrating TH signaling disrupting effects of BPF...
January 11, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29323882/quantitative-shotgun-proteomics-associates-molecular-level-cadmium-toxicity-responses-with-compromised-growth-and-reproduction-in-a-marine-copepod-under-multigenerational-exposure
#9
Minghua Wang, Chen Zhang, Jae-Seong Lee
In this study, the copepod Tigriopus japonicus was exposed to different cadmium (Cd) treatments (0, 2.5, 5, 10 and 50 µg/L in seawater) for five generations (F0-F4), followed by a two-generation (F5-F6) recovery period in clean seawater. Six life-history traits (survival, developmental time of nauplius phase, developmental time to maturation, number of clutches, number of nauplii/clutch, and fecundity) were examined for each generation. Metal accumulation was also analyzed for generations F0-F6. Additionally, proteome profiling was performed for the control and 50 µg/L Cd-treated F4 copepods...
January 11, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29320854/a-highly-resolved-mercury-emission-inventory-of-chinese-coal-fired-power-plants
#10
Kaiyun Liu, Shuxiao Wang, Qingru Wu, Long Wang, Qiao Ma, Lei Zhang, Guoliang Li, Hezhong Tian, Lei Duan, Jiming Hao
As the largest coal consumer in China, the coal-fired power plants have come under increasing public concern in regard to atmospheric mercury pollution. This study developed an up-to-date and high-resolution mercury emission inventory of Chinese coal-fired power plants using a unit-based method that combined data from individual power plants, provincial coal characteristics, and industry removal efficiencies. National mercury emissions in 2015 were estimated at 73 tons, including 54 tons of elemental mercury, 18 tons of gaseous oxidized mercury and 1 ton of particle-bound mercury...
January 11, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29320852/exposures-to-atmospheric-pm10-and-pm10-2-5-affect-male-semen-quality-results-of-marhcs-study
#11
Niya Zhou, Changtan Jiang, Qing Chen, Huan Yang, Xiaogang Wang, Peng Zou, Lei Sun, Jiaojiao Liu, Ling Li, Lianbing Li, Linping Huang, Hongqiang Chen, Lin Ao, Ziyuan Zhou, Jinyi Liu, Zhihong Cui, Jia Cao
Studies have shown that the effects of ambient particulate matter (PM) may be related to particle's size. However, results on the relationships between different PM and reproductive health are controversial. To explore the impacts of various PM fractions on male reproductive health, a total of 796 eligible subjects recruited in 2013 baseline investigation. In addition, there were 656 (82.4%) and 568 (71.3%) subjects participated follow-up surveys in 2014 and 2015, respectively. We used multivariable regression analysis and mixed-effect model to investigate the associations between air pollutants PM10, PM10-2...
January 11, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29320848/assessment-of-metal-immission-in-urban-environments-using-elemental-concentrations-and-zn-isotope-signatures-in-leaves-of-nerium-oleander
#12
Ana Martín, Cristina Caldelas, Dominik Jakob Weiss, Iker Aranjuelo, Enrique Navarro
A thorough understanding of spatial and temporal emission and immission patterns of air pollutants in urban areas is challenged by the low number of air quality monitoring stations available. Plants are promising low cost biomonitoring tools. However, source identification of the trace metals incorporated in plant tissues (i.e. natural vs. anthropogenic) and the identification of the best plant to use remain fundamental challenges. To this end, Nerium oleander L. collected in the city of Zaragoza (NE Spain) has been investigated as a biomonitoring tool for assessing the spatial immission patterns of airborne metals (Pb, Cu, Cr, Ni, Ce, and Zn)...
January 10, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29320633/bioaccumulation-of-polybrominated-diphenyl-ethers-pbdes-and-alternative-halogenated-flame-retardants-in-a-vegetation-caribou-wolf-food-chain-of-the-canadian-arctic
#13
Adam David Morris, Derek Muir, Keith Solomon, Camilla Teixeira, Mark Duric, Xiaowa Wang
The trophodynamics of halogenated flame retardants (HFRs) including polybrominated diphenyl ethers (PBDEs) and alternative HFRs were investigated in the terrestrial, vegetation-caribou-wolf food chain in the Bathurst Region of northern Canada. The greatest concentrations in vegetation (geometric mean of lichens, moss, grasses, willow, and mushrooms) were of the order 2,4,6-tribromophenyl allyl ether (TBP-AE) (10 ng g-1 lw) > BDE47 (5.5 ng g-1 lw) > BDE99 (3.9 ng g-1 lw) > BDE100 (0.82 ng g-1 lw) > 1,2,3,4,5-pentabromobenzene (PBBz) (0...
January 10, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29320174/comprehensive-analysis-of-changes-in-crude-oil-chemical-composition-during-biosouring-and-treatments
#14
Jeremy A Nowak, Pravin Malla Shrestha, Robert Jay Weber, Amy M McKenna, Huan Chen, John D Coates, Allen H Goldstein
Biosouring in crude oil reservoirs by sulfate-reducing microbial communities (SRCs) results in hydrogen sulfide production, precipitation of metal sulfide complexes, increased industrial costs of petroleum production, and exposure issues for personnel. Potential treatment strategies include nitrate or perchlorate injections into reservoirs. Gas chromatography with vacuum ultraviolet ionization and high-resolution time-of-flight mass spectrometry (GC-VUV-HTOF) and Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) combined with electrospray ionization were applied in this study to identify hydrocarbon degradation patterns and product formations in crude oil samples from biosoured, nitrate treated, and perchlorate treated bioreactor column experiments...
January 10, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29320169/short-medium-and-long-chain-chlorinated-paraffins-in-wildlife-from-paddy-fields-in-the-yangtze-river-delta
#15
Xinyu Du, Bo Yuan, Yihui Zhou, Jonathan P Benskin, Yanling Qiu, Ge Yin, Jianfu Zhao
Short-chain chlorinated paraffins (SCCPs) were added to Annex A of the Stockholm Convention on Persistent Organic Pollutants in April, 2017. As a consequence of this regulation, increasing production and usage of alternatives, such as medium- and long-chain chlorinated paraffins (MCCPs and LCCPs, respectively), is expected. Little is known about the environmental fate and behavior of MCCPs and LCCPs. In the present study, SCCPs, MCCPs, and LCCPs were analyzed in nine wildlife species from paddy fields in the Yangtze River Delta, China, using atmospheric pressure chemical ionization-quadrupole time-of-flight mass spectrometry...
January 10, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29320168/linking-natural-oil-seeps-from-the-gulf-of-mexico-to-their-origin-by-use-of-fourier-transform-ion-cyclotron-resonance-mass-spectrometry
#16
Logan C Krajewski, Vladislav V Lobodin, Caroline Johansen, Tessa E Bartges, Ekaterina V Maksimova, Ian R MacDonald, Alan G Marshall
We report chemical characterization of natural oil seeps from the Gulf of Mexico by Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) and Gas Chromatography/Atmospheric Pressure Chemical Ionization Mass Spectrometry (GC/APCI-MS), to highlight how FT-ICR MS can also be employed as a means to determine petroleum connectivity, in addition to traditional GC/MS techniques. The source of petroleum is the Green Canyon (GC) 600 lease block in the Gulf of Mexico. Within GC600, two natural oil seepage zones, Mega Plume and Birthday Candles, continuously release hydrocarbons and develop persistent oil slicks at the sea surface above them...
January 10, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29319308/effect-of-soil-fulvic-and-humic-acid-on-pb-binding-to-the-goethite-solution-interface-ligand-charge-distribution-modeling-and-speciation-distribution-of-pb
#17
Juan Xiong, Liping Weng, Luuk Koopal, Mingxia Wang, Zhihua Shi, Li-Rong Zheng, WenFeng Tan
The effect of adsorbed soil fulvic (JGFA) and humic acid (JGHA) on Pb binding to goethite was studied with the Ligand Charge Distribution (LCD) model and the X-ray absorption fine structure (XAFS) spectroscopy analysis. In LCD model, the adsorbed small JGFA particles were evenly located in the Stern layer, but the large JGHA particles were distributed over the Stern layer and the diffuse layer which mainly depended on the JGHA diameter and concentrations. Specific interactions of HS with goethite were modeled by inner-sphere complexes between -FeOH2+0...
January 10, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29318874/global-human-appropriation-of-net-primary-production-and-associated-resource-decoupling-2010-2050
#18
Chuanbin Zhou, Ayman Elshkaki, Thomas E Graedel
Human appropriation of net primary production (HANPP) methodology has previously been developed to assess the intensity of anthropogenic extraction of biomass resource. However, there is limited analysis concerning future trends of HANPP. Here we present four scenarios for global biomass demand) and HANPPharv (the most key component of HANPP) from 2010 to 2050 by incorporating data on expanded historical drivers and disaggregated biomass demand (food, wood material, and fuelwood). The results show that the biomass demand has the lowest value in the Equitability World scenario (an egalitarian vision) and the highest value in the Security Foremost scenario (an isolationist vision)...
January 10, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29316392/the-overlooked-occurrence-of-environmentally-persistent-free-radicals-in-an-area-with-low-rank-coal-burning-xuanwei-china
#19
Peng Wang, Bo Pan, Hao Li, Yu Huang, Xudong Dong, Fang Ai, Lingyan Liu, Min Wu, Baoshan Xing
The mining and burning of low-rank coal in Xuanwei, China have attracted a great deal of research attention because of the generated polyaromatic hydrocarbons (PAHs) and the high incidence of lung cancer in this region. Given the abundant transition metals in the allitic soil, we hypothesized that environmentally persistent free radicals (EPFRs) are formed in this region and the potential risk had not been addressed. Strong electron paramagnetic resonance (EPR) signals of 3.20 × 1017 - 3.10 × 1019 spins/g were detected in environmental samples, including chimney soot, coal, soil and total suspended particles (TSP)...
January 9, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29314834/interface-mechanisms-of-catalytic-ozonation-with-amorphous-iron-silicate-for-removal-of-4-chloronitrobenzene-in-aqueous-solution
#20
Lei Yuan, Jimin Shen, Pengwei Yan, Zhonglin Chen
Iron silicate was synthesized and characterized as an efficient ozonation catalyst. Results indicated that iron silicate is a microporous material with poor crystallinity. Fe-O-Si and Fe-O bonds were observed on its surface. The Fe-O bonds belonged to α-Fe2O3. Heterogeneous catalytic ozonation test was performed in batch reaction mode, and 4-chloronitrobenzene was used as model organic compounds. Amorphous iron silicate exhibited high catalytic activity, ozone utilization efficiency, and stability in catalytic ozonation...
January 9, 2018: Environmental Science & Technology
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