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Chemosphere

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https://www.readbyqxmd.com/read/28087152/corrigendum-to-numerical-study-of-the-effects-of-lamp-configuration-and-reactor-wall-roughness-in-an-open-channel-water-disinfection-uv-reactor-chemosphere-155-2016-170-179
#1
https://www.readbyqxmd.com/read/28092766/effect-of-multi-walled-carbon-nanotubes-on-phytotoxicity-of-sediments-contaminated-by-phenanthrene-and-cadmium
#2
Biao Song, Guangming Zeng, Jilai Gong, Peng Zhang, Jiaqin Deng, Canhui Deng, Jin Yan, Piao Xu, Cui Lai, Chen Zhang, Min Cheng
To implement effective control and abatement programs for contaminants accumulating in sediments, strategies are needed for evaluating the quality of amended sediments. In this study, phytotoxicity of the sediments contaminated by cadmium and phenanthrene was evaluated after in situ remediation with multi-walled carbon nanotubes (MWCNTs) as adsorbents. Adsorption experiments and measurement of aqueous concentrations of the contaminants in overlying water were used to investigate the remediation effectiveness from physical and chemical aspects...
January 9, 2017: Chemosphere
https://www.readbyqxmd.com/read/28092769/spatiotemporal-change-of-phosphorous-speciation-and-concentration-in-stormwater-in-the-st-lucie-estuary-watershed-south-florida
#3
Liguang Li, Zhenli He, Zhigang Li, Suli Li, Yongshan Wan, Peter J Stoffella
Phosphorous (P) concentration in stormwater runoff varies at different spatial and temporal scales. Excessive P loading from agriculture system into the St. Lucie Estuary (SLE) contributed to water quality deterioration in southern Indian River Lagoon. This study examines the spatial and temporal shifts of different P forms in runoff and storm water under different land use, water management, and rainfall conditions. Storm water samplings were conducted monthly between April 2013 and December 2014 in typical farmland and along the waterway (Canal C-24) that connects lands to the SLE...
January 6, 2017: Chemosphere
https://www.readbyqxmd.com/read/28092765/cytotoxic-genotoxic-and-mutagenic-evaluation-of-surface-waters-from-a-coal-exploration-region
#4
Cynthia Silva Porta, Débora Lemes Dos Santos, Hélio Vieira Bernardes, Bruno Corrêa Bellagamba, Anaí Duarte, Johnny Ferraz Dias, Fernanda Rabaioli da Silva, Mauricio Lehmann, Juliana da Silva, Rafael Rodrigues Dihl
Coal mining generates a considerable amount of waste, which is disposed of in piles or dams near mining sites. As a result, leachates may reach rivers and streams, promoting the wide dispersion of contaminants in solution and as particulate matter. The present study evaluated the cytotoxic, genotoxic, and mutagenic action of surface waters collected around a thermoelectric power plant and the largest mining area in Brazil (Candiota). Four sites in Candiota stream were selected, and samples were collected in winter and summer...
January 6, 2017: Chemosphere
https://www.readbyqxmd.com/read/28092764/common-deregulated-gene-expression-profiles-and-morphological-changes-in-developing-zebrafish-larvae-exposed-to-environmental-relevant-high-to-low-concentrations-of-glucocorticoids
#5
Qiyu Chen, Caixia Li, Zhiyuan Gong, Eric Chun Yong Chan, Shane A Snyder, Siew Hong Lam
Synthetic glucocorticoids have been detected in environmental waters and their biological potency have raised concerns of their impact on aquatic vertebrates especially fish. In this study, developing zebrafish larvae exposed to representative glucocorticoids (dexamethasone, prednisolone and triamcinolone) at 50 pM to 50 nM from 3 h post-fertilisation to 5 days post-fertilisation were investigated. Microarray analysis identified 1255, 1531, and 2380 gene probes, which correspondingly mapped to 660, 882 and 1238 human/rodent homologs, as deregulated by dexamethasone, prednisolone and triamcinolone, respectively...
January 6, 2017: Chemosphere
https://www.readbyqxmd.com/read/28088530/distribution-of-antibiotic-resistance-in-the-effluents-of-ten-municipal-wastewater-treatment-plants-in-china-and-the-effect-of-treatment-processes
#6
Weiwei Ben, Jian Wang, Rukun Cao, Min Yang, Yu Zhang, Zhimin Qiang
Municipal wastewater treatment plant (WWTP) effluents represent an important contamination source of antibiotic resistance, threatening the ecological safety of receiving environments. In this study, the release of antibiotic resistance to sulfonamides and tetracyclines in the effluents of ten WWTPs in China was investigated. Results indicate that the concentrations of antibiotic-resistant bacteria (ARB) and antibiotic resistance genes (ARGs) ranged from 1.1 × 10(1) to 8.9 × 10(3) CFU mL(-1) and 3.6 × 10(1) (tetW) to 5...
January 6, 2017: Chemosphere
https://www.readbyqxmd.com/read/28088022/valorization-of-aluminum-scrap-via-an-acid-washing-treatment-for-reductive-removal-of-toxic-bromate-from-water
#7
Kun-Yi Andrew Lin, Jia-Yin Lin, Hsing-Lung Lien
Aluminum scrap (AS) is adopted for the first time as a readily available aluminum source to prepare zero-valent aluminum (ZVAl) for removing bromate from water via a reductive reaction. Since aluminum is easily oxidized to aluminum oxide (Al2O3) on exposure to air, an acid-washing pretreatment on AS is developed to remove the layer of Al2O3. HCl is found as the most effective acid to pretreat AS and the HCl-pretreated or acid-washed AS (AWAS) is able to remove bromate from water and convert it to bromide. Factors, such as temperature, pH, co-existing anions, and particle size, which influence the bromate removal using AWAS are also investigated...
January 6, 2017: Chemosphere
https://www.readbyqxmd.com/read/28092763/growth-and-antioxidant-defense-responses-of-wheat-seedlings-to-di-n-butyl-phthalate-and-di-2-ethylhexyl-phthalate-stress
#8
Minling Gao, Youming Dong, Ze Zhang, Wenhua Song, Yun Qi
Phthalate acid esters (PAEs) are vital environmental hormone-like chemicals that are noxious to plants, animals, and human beings. In this study, the influences of di-n-butyl phthalate (DBP) and di (2-ethylhexyl) phthalate (DEHP) on the seed germination, root morphology, and various physiological changes of wheat seedlings were investigated by analyzing superoxide anion (O2(-)) accumulation, antioxidant enzyme activity, and lipid peroxidation. DBP and DEHP were found to obviously inhibit germination only at high concentrations, but significantly affected root morphology even at lower concentrations...
January 5, 2017: Chemosphere
https://www.readbyqxmd.com/read/28088531/the-effect-of-dissolved-organic-matter-on-soybean-peroxidase-mediated-removal-of-triclosan-in-water
#9
Jianhua Li, Ya Zhang, Jianbiao Peng, Xinan Wu, Shixiang Gao, Liang Mao
Dissolved organic matter (DOM) is ubiquitous in water and involved in numerous important chemical processes in aqueous systems, enabling it a unique challenge for a variety of water treatment processes. Soybean peroxidase (SBP)-based enzymatic process, as a promising treatment technique, has been successfully applied to remove pollutants in wastewaters such as coal-tar and refinery wastewater. In this study, the effect of DOM on the removal of polychlorinated aromatic antimicrobials triclosan (TCS) by SBP was investigated...
January 5, 2017: Chemosphere
https://www.readbyqxmd.com/read/28088528/study-of-the-involved-sorption-mechanisms-of-cr-vi-and-cr-iii-species-onto-dried-salvinia-auriculata-biomass
#10
Aparecido Nivaldo Módenes, Ana Paula de Oliveira, Fernando R Espinoza-Quiñones, Daniela Estelita Goes Trigueros, Alexander Dimitrov Kroumov, Rosângela Bergamasco
Removal of Cr(VI) species by dried biomass of the aquatic macrophyte Salvinia auriculata was studied in order to understand the involved sorption mechanisms. Kinetic tests were carried out under the conditions such as concentration range of Cr(VI) from 50 to 250 mg L(-1) and a temperature of 30 °C. Modification of the biosorbent by the presence of Cr(VI) species was assessed by analysis of its porosity, density and infrared molecular absorption spectrum. A series of experimental approaches involving directed chemical modifications on the biosorbent surface was performed...
January 5, 2017: Chemosphere
https://www.readbyqxmd.com/read/28086156/effects-of-different-agricultural-wastes-on-the-dissipation-of-pahs-and-the-pah-degrading-genes-in-a-pah-contaminated-soil
#11
Xuemei Han, Hangwei Hu, Xiuzhen Shi, Limei Zhang, Jizheng He
Land application of agricultural wastes is considered as a promising bioremediation approach for cleaning up soils contaminated by aged polycyclic aromatic hydrocarbons (PAHs). However, it remains largely unknown about how microbial PAH-degraders, which play a key role in the biodegradation of soil PAHs, respond to the amendments of agricultural wastes. Here, a 90-day soil microcosm study was conducted to compare the effects of three agricultural wastes (i.e. WS, wheat stalk; MCSW, mushroom cultivation substrate waste; and CM, cow manure) on the dissipation of aged PAHs and the abundance and community structure of PAH-degrading microorganisms...
January 5, 2017: Chemosphere
https://www.readbyqxmd.com/read/28086155/kinetics-mechanisms-and-influencing-factors-on-the-treatment-of-haloacetonitriles-hans-in-water-by-two-household-heating-devices
#12
Wendong Shi, Lei Wang, Baiyang Chen
Haloacetonitriles (HANs) are a group of nitrogenous disinfection by-products (DBPs) commonly found in treated water with potential carcinogenic, cytotoxic, and genotoxic risks. In order to control HANs and understand their real intake levels by people via drinking water, this study evaluated a list of structural, operational, and environmental factors affecting the treatment of HANs by two domestic heating devices, i.e., an electric boiler and a microwave oven. Results show that the concentrations of HANs decreased exponentially over time with increasing temperature, water turbulence, and bubbles, and the phenomena were most likely due to a combined effect of volatilization and hydrolysis...
January 5, 2017: Chemosphere
https://www.readbyqxmd.com/read/28092767/effects-of-oil-dispersant-on-ozone-oxidation-of-phenanthrene-and-pyrene-in-marine-water
#13
Yanyan Gong, Dongye Zhao
This work investigated effects of a popular oil dispersant (Corexit EC9500A) on oxidation of phenanthrene and pyrene (two model polycyclic aromatic hydrocarbons) in Gulf coast seawater under simulated atmospheric ozone. The degradation data followed a two-stage pseudo-first order kinetics, a slower initial reaction rate followed by a much faster rate in longer time. The ozonation rate for pyrene was faster than that for phenanthrene. The presence of 18 and 180 mg/L of the dispersant inhibited the first-order degradation rate by 32-80% for phenanthrene, and 51-85% for pyrene...
January 4, 2017: Chemosphere
https://www.readbyqxmd.com/read/28088023/a-novel-model-to-predict-gas-phase-hydroxyl-radical-oxidation-kinetics-of-polychlorinated-compounds
#14
Shuang Luo, Zongsu Wei, Richard Spinney, Zhihui Yang, Liyuan Chai, Ruiyang Xiao
In this study, a novel model based on aromatic meta-substituent grouping was presented to predict the second-order rate constants (k) for OH oxidation of PCBs in gas-phase. Since the oxidation kinetics are dependent on the chlorination degree and position, we hypothesized that it may be more accurate for k value prediction if we group PCB congeners based on substitution positions (i.e., ortho (o), meta (m), and para (p)). To test this hypothesis, we examined the correlation of polarizability (α), a quantum chemical based descriptor for k values, with an empirical Hammett constant (σ(+)) on each substitution position...
January 4, 2017: Chemosphere
https://www.readbyqxmd.com/read/28073034/unraveling-the-different-toxic-effect-of-flufenoxuron-on-the-thyroid-endocrine-system-of-the-mongolia-racerunner-eremias-argus-at-different-stages
#15
Jing Chang, Wei Li, Baoyuan Guo, Peng Xu, Yinghuan Wang, Jianzhong Li, Huili Wang
Flufenoxuron is a widely used pesticide to inhibit the synthesis of chitin during insect development and its effect on the growth of lizards has been little addressed. The hypothalamus-pituitary-thyroid (HPT) axis plays an important role on the development of lizards. In this study, the lizards at different development stages (proliferation and resting stages) were exposed to flufenoxuron for 21 days. The plasma thyroid hormone levels, thyroid gland histopathology and expression profiles of thyroid hormone receptors (trα, trβ), deiodinases (dio1, dio2), and transthyretin (ttr) genes were measured to evaluated the toxic effect of flufenoxuron on the HPT axis at different stages...
January 4, 2017: Chemosphere
https://www.readbyqxmd.com/read/28068571/photocatalytic-degradation-of-clofibric-acid-by-g-c3n4-p25-composites-under-simulated-sunlight-irradiation-the-significant-effects-of-reactive-species
#16
Ping Chen, Fengliang Wang, Qianxin Zhang, Yuehan Su, Lingzhi Shen, Kun Yao, Zhi-Feng Chen, Yang Liu, Zongwei Cai, Wenying Lv, Guoguang Liu
Pharmaceutically emerging micropollutants have become an environmental concern in recent years. In the present paper, the reactive species (RSs)-induced degradation mechanism of clofibric acid (CA) was investigated using a newly sunlight-driven g-C3N4/P25 photocatalyst. A very low g-C3N4 content of 8.0 weight percent resulted in a 3.36 and a 2.29 times faster reaction rate for CA photodegradation than for pristine g-C3N4 and P25, respectively. Electron spin resonance and quenching experiments demonstrated the participation of HO, h(+), e(-), (1)O2 and O2(·-) in the photocatalytic system, and the contribution rates were calculated to 73...
January 4, 2017: Chemosphere
https://www.readbyqxmd.com/read/28081510/gestational-and-lactational-exposure-to-di-isobutyl-phthalate-via-diet-in-maternal-mice-decreases-testosterone-levels-in-male-offspring
#17
Xiaoyang Wang, Nan Sheng, Ruina Cui, Hongxia Zhang, Jianshe Wang, Jiayin Dai
Phthalates are a large family of ubiquitous environmental chemicals suspected of being endocrine disruptors, with exposure to these chemicals during prenatal and postnatal development possibly resulting in reproductive disorders. Di-isobutyl phthalate (DiBP) is widely used in consumer and industrial products, and although its exposure in the general population has increased in recent years, the mechanisms behind DiBP-induced reproductive disorders in male offspring remain unclear. Here, pregnant mice were exposed to 0 or 450 mg/kg bw/day DiBP via diet from gestation day (GD) 0 to GD21...
January 3, 2017: Chemosphere
https://www.readbyqxmd.com/read/28088025/residues-of-2-hydroxy-3-phenylpyrazine-a-degradation-product-of-some-%C3%AE-lactam-antibiotics-in-environmental-water-in-vietnam
#18
Nguyen Van Sy, Kazuo Harada, Megumi Asayama, Minae Warisaya, Le Hong Dung, Yoshinori Sumimura, Khong Thi Diep, Le Viet Ha, Nguyen Nam Thang, Tran Thi Tuyet Hoa, Tran Minh Phu, Pham Ngoc Khai, Nguyen Thanh Phuong, Le Danh Tuyen, Yoshimasa Yamamoto, Kazumasa Hirata
Antibiotic-resistant bacteria have become a serious problem worldwide, caused in part by the excessive use and discharge of antibiotics into the environment. Ampicillin (ABPC) is a widely used antibiotic. However, this chemical rapidly decomposes in water containing divalent cations like Ca(2+) and Mg(2+), thus, detection of ABPC in environmental water is difficult. This study was carried out to evaluate the presence of 2-hydroxy-3-phenylpyrazine (HPP), one of the degradation products of ABPC and β-lactam antibiotics with an ABPC substructure, in environmental water...
January 2, 2017: Chemosphere
https://www.readbyqxmd.com/read/28081511/spatiotemporal-distributions-of-butyltin-compounds-in-various-intertidal-organisms-along-the-samcheok-and-tongyeong-coasts-of-korea
#19
Taewoo Kim, Seungyeon Jeon, Seongjin Hong, Sung Joon Song, Bong-Oh Kwon, Jongseong Ryu, Jong Seong Khim
Thirteen years ago, the Korean Government introduced a regulation prohibiting the use of tributyltin (TBT), which was a component of antifouling paints. A subsequent decline in the concentration of butyltins (BTs) was recorded in seawater and the sediment, however, the current concentration of BTs in biota has not been well documented. The spatiotemporal distribution and concentration of BTs was recorded in biota from 2013 to 2015 along the coasts of Samcheok and Tongyeong using GS/MSD analysis. Crustaceans contained the greatest concentrations of BTs, followed by gastropods, fishes, and bivalves...
January 2, 2017: Chemosphere
https://www.readbyqxmd.com/read/28081509/in-silico-prediction-of-toxicity-of-phenols-to-tetrahymena-pyriformis-by-using-genetic-algorithm-and-decision-tree-based-modeling-approach
#20
Fatemeh Abbasitabar, Vahid Zare-Shahabadi
Risk assessment of chemicals is an important issue in environmental protection; however, there is a huge lack of experimental data for a large number of end-points. The experimental determination of toxicity of chemicals involves high costs and time-consuming process. In silico tools such as quantitative structure-toxicity relationship (QSTR) models, which are constructed on the basis of computational molecular descriptors, can predict missing data for toxic end-points for existing or even not yet synthesized chemicals...
January 2, 2017: Chemosphere
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