journal
MENU ▼
Read by QxMD icon Read
search

Chemosphere

journal
https://www.readbyqxmd.com/read/28917209/ecological-risk-estimation-of-organophosphorus-pesticides-in-riverine-ecosystems
#1
Sze Yee Wee, Ahmad Zaharin Aris
Pesticides are of great concern because of their existence in ecosystems at trace concentrations. Worldwide pesticide use and its ecological impacts (i.e., altered environmental distribution and toxicity of pesticides) have increased over time. Exposure and toxicity studies are vital for reducing the extent of pesticide exposure and risk to the environment and humans. Regional regulatory actions may be less relevant in some regions because the contamination and distribution of pesticides vary across regions and countries...
September 13, 2017: Chemosphere
https://www.readbyqxmd.com/read/28918289/effective-removal-of-trace-thallium-from-surface-water-by-nanosized-manganese-dioxide-enhanced-quartz-sand-filtration
#2
Xiaoliu Huangfu, Chengxue Ma, Jun Ma, Qiang He, Chun Yang, Jian Zhou, Jin Jiang, Yaan Wang
Thallium (Tl) has drawn wide concern due to its high toxicity even at extremely low concentrations, as well as its tendency for significant accumulation in the human body and other organisms. The need to develop effective strategies for trace Tl removal from drinking water is urgent. In this study, the removal of trace Tl (0.5 μg L(-1)) by conventional quartz sand filtration enhanced by nanosized manganese dioxide (nMnO2) has been investigated using typical surface water obtained from northeast China. The results indicate that nMnO2 enhanced quartz sand filtration could remove trace Tl(I) and Tl(III) efficiently through the adsorption of Tl onto nMnO2 added to a water matrix and onto nMnO2 attached on quartz sand surfaces...
September 12, 2017: Chemosphere
https://www.readbyqxmd.com/read/28910728/hygroscopicity-of-internally-mixed-particles-composed-of-nh4-2so4-and-citric-acid-under-pulsed-rh-change
#3
Xiao-Min Shi, Feng-Min Wu, Bo Jing, Na Wang, Lin-Lin Xu, Shu-Feng Pang, Yun-Hong Zhang
In this research, we applied a pulsed RH controlling system and a rapid scan vacuum FTIR spectrometer (PRHCS-RSVFTIR) to investigate hygroscopicity of internally mixed (NH4)2SO4(AS)/citric acid (CA) particles. The water content and efflorescence ratio of AS in the particles and ambient relative humidity (RH) as a function of time were obtained with a subsecond time resolution. The hygroscopic behavior of AS aerosols in two different RH control processes (equilibrium and RH pulsed processes) showed that AS droplets crystallize with RH ranging from 42% to 26...
September 9, 2017: Chemosphere
https://www.readbyqxmd.com/read/28917214/novel-5-nitrofurfuryl-substituted-esters-of-phosphonoglycine-their-synthesis-and-phyto-and-ecotoxicological-properties
#4
Jarosław Lewkowski, Marta Morawska, Rafał Karpowicz, Piotr Rychter, Diana Rogacz, Kamila Lewicka
Since aminophosphonate-based herbicides like glyphosate are currently one of the most popular and widely applied active agent in agrochemistry, there is an urgent need for searching new compounds among this family with potential herbicidal activity, but exhibiting low toxicity against surrounding environment. Six new (5-nitrofurfuryl)-derived aminophosphonates were synthesized for the first time and apart from the only one example of N-benzylamino(5-nitrofuryl)-methylphosphonic acid, it was the first time in the history, when this class of compounds was prepared...
September 8, 2017: Chemosphere
https://www.readbyqxmd.com/read/28915374/enhanced-degradation-of-chloramphenicol-at-alkaline-conditions-by-s-ii-assisted-heterogeneous-fenton-like-reactions-using-pyrite
#5
Linghui Zhao, Yufan Chen, Yanxia Liu, Cong Luo, Deli Wu
The Fenton-like reactions catalyzed by pyrite can efficiently degrade organic contaminants by oxidation process. When chloramphenicol (CAP) was exposed to the pyrite-H2O2 system, the CAP removal rate rapidly reached 100% however slowed to a halt at alkaline conditions. Results indicated that by adding S(-II) in pyrite-H2O2 system improved the oxidation efficiency of CAP at alkaline conditions. The transformation of S2(2-) and Sn(2-) observed by X-ray photoelectron spectroscopy (XPS), confirmed that amorphous iron polysulfide (FeSn) was freshly generated on the pyrite surface...
September 8, 2017: Chemosphere
https://www.readbyqxmd.com/read/28910727/gene-environment-interaction-does-fluoride-influence-the-reproductive-hormones-in-male-farmers-modified-by-er%C3%AE-gene-polymorphisms
#6
Qiang Ma, Hui Huang, Long Sun, Tong Zhou, Jingyuan Zhu, Xuemin Cheng, Lijv Duan, Zhiyuan Li, Liuxin Cui, Yue Ba
The occurrence of endemic fluorosis is derived from high fluoride levels in drinking water and industrial fumes or dust. Reproductive disruption is also a major harm caused by fluoride exposure besides dental and skeletal lesions. However, few studies focus on the mechanism of fluoride exposure on male reproductive function, especially the possible interaction of fluoride exposure and gene polymorphism on male reproductive hormones. Therefore, we conducted a cross-sectional study in rural areas of Henan province in China to explore the interaction between the estrogen receptor alpha (ERα) gene and fluoride exposure on reproductive hormone levels in male farmers living in the endemic fluorosis villages...
September 8, 2017: Chemosphere
https://www.readbyqxmd.com/read/28910723/sorption-desorption-equilibrium-and-diffusion-of-tetracycline-in-poultry-litter-and-municipal-biosolids-soil-amendments
#7
E D'Angelo
Tetracycline (TET) is commonly used to treat bacterial diseases in humans and chickens (Gallus gallus domesticus), is largely excreted, and is found at elevated concentrations in treated sewage sludge (biosolids) and poultry litter (excrement plus bedding materials). Routine application of these nutrient-and carbon-enriched materials to soils improves fertility and other characteristics, but the presence of antibiotics (and other pharmaceuticals) in amendments raises questions about potential adverse effects on biota and development of antibiotic resistance in the environment...
September 8, 2017: Chemosphere
https://www.readbyqxmd.com/read/28892772/multi-class-of-endocrine-disrupting-compounds-in-aquaculture-ecosystems-and-health-impacts-in-exposed-biota
#8
REVIEW
Nur Afifah Hanun Ismail, Sze Yee Wee, Ahmad Zaharin Aris
Fishes are a major protein food source for humans, with a high economic value in the aquaculture industry. Because endocrine disrupting compounds (EDCs) have been introduced into aquatic ecosystems, the exposure of humans and animals that depend on aquatic foods, especially fishes, should be seriously considered. EDCs are emerging pollutants causing global concern because they can disrupt the endocrine system in aquatic organisms, mammals, and humans. These pollutants have been released into the environment through many sources, e...
September 8, 2017: Chemosphere
https://www.readbyqxmd.com/read/28915375/the-presence-of-mercury-and-other-trace-metals-in-surface-soils-in-the-norwegian-arctic
#9
Katharina Halbach, Øyvind Mikkelsen, Torunn Berg, Eiliv Steinnes
Svalbard is an important study area for investigating the long-range transport of mercury (Hg) and other trace elements to the Arctic. Few studies have focused on their concentrations in Arctic soils. With ongoing climate change leading to thawing permafrost ground the soil compartment is of increasing importance in the Arctic. In this study, elemental composition and soil organic matter (SOM) content of surface and mineral soils in Svalbard are presented. The aim is to provide new data on soils in the Arctic and to gain more knowledge about the role of the soil in the biogeochemical cycle of mercury (Hg)...
September 7, 2017: Chemosphere
https://www.readbyqxmd.com/read/28898775/the-effect-of-anthropogenic-impoundment-on-dissolved-organic-matter-characteristics-and-copper-binding-affinity-insights-from-fluorescence-spectroscopy
#10
Bin Hu, Peifang Wang, Chao Wang, Jin Qian, Jun Hou, Xiaoai Cui, Nannan Zhang
Excitation-emission matrix fluorescence spectroscopy combined with parallel factor analysis (EEM-PARAFAC) and two-dimensional correlation spectroscopy (2D-COS) were applied to evaluate the effects of anthropogenic impoundment on the characteristics of dissolved organic matter (DOM) and its heavy metal binding affinity. Three field-sampling cruises conducted in Hongze Lake from 2015 to 2016 were classified as early impoundment and late impoundment cruises according to the hydrological conditions. Five fluorescence components were derived from EEM-PARAFAC, including three humic-like components (C1C3) and two protein-like components (C4 and C5)...
September 7, 2017: Chemosphere
https://www.readbyqxmd.com/read/28917213/hydraulic-connectivity-and-evaporation-control-the-water-quality-and-sources-of-chromophoric-dissolved-organic-matter-in-lake-bosten-in-arid-northwest-china
#11
Lei Zhou, Yongqiang Zhou, Yang Hu, Jian Cai, Chengrong Bai, Keqiang Shao, Guang Gao, Yunlin Zhang, Erik Jeppesen, Xiangming Tang
Lake Bosten is the largest oligosaline lake in arid northwestern China, and water from its tributaries and evaporation control the water balance of the lake. In this study, water quality and chromophoric dissolved organic matter (CDOM) absorption and fluorescence were investigated in different seasons to elucidate how hydraulic connectivity and evaporation may affect the water quality and variability of CDOM in the lake. Mean suspended solids and turbidity were significantly higher in the upstream tributaries than in the lake, the difference being notably more pronounced in the wet than in the dry season...
September 6, 2017: Chemosphere
https://www.readbyqxmd.com/read/28917212/comparative-analytical-and-toxicological-assessment-of-methylcyclohexanemethanol-mchm-mixtures-associated-with-the-elk-river-chemical-spill
#12
Katharine A Horzmann, Chloe de Perre, Linda S Lee, Andrew J Whelton, Jennifer L Freeman
On January 9, 2014, a chemical mixture containing crude methylcyclohexanemethanol (MCHM) contaminated the water supply of Charleston, West Virginia. Although the mixture was later identified as a mix of crude MCHM and stripped propylene glycol phenyl ethers, initial risk assessment focused on 4-MCHM, the predominant component of crude MCHM. The mixture's exact composition and the toxicity differences between 4-MCHM, crude MCHM, and the tank mixture were unknown. We analyzed the chemical composition of crude MCHM and the tank mixture via GC/MS and, based on identified spectra, found that crude MCHM and the tank mixture differed in chemical composition...
September 6, 2017: Chemosphere
https://www.readbyqxmd.com/read/28917210/single-and-mixture-toxicity-of-abamectin-and-difenoconazole-to-adult-zebrafish-danio-rerio
#13
Ana Letícia Madeira Sanches, Bruna Horvath Vieira, Marina Vanderlei Reghini, Raquel Aparecida Moreira, Emanuela Cristina Freitas, Evaldo L G Espíndola, Michiel A Daam
Concerns have been raised in recent years on the potential risks related with pesticide mixtures that are likely to be present in agricultural edge-of-field waterbodies. Despite the high use of pesticides in tropical countries like Brazil, studies evaluating pesticide mixtures are especially scarce in the tropics. The insecticide abamectin and the fungicide difenoconazole are the main pesticides intensively used in Brazilian strawberry crop and are hence likely to occur simultaneously. The aim of the present study was therefore to evaluate the toxicity of abamectin, difenoconazole and their mixture to the tropical fish Danio rerio...
September 6, 2017: Chemosphere
https://www.readbyqxmd.com/read/28910725/acute-and-subchronic-toxicity-of-pyraclostrobin-in-zebrafish-danio-rerio
#14
Cheng Zhang, Jun Wang, Shuai Zhang, Lusheng Zhu, Zhongkun Du, Jinhua Wang
The aim of the present study was to assess the toxic effects of pyraclostrobin on DNA damage and antioxidant enzymatic activities in the zebrafish (Danio rerio) liver. Based on the 96-h median lethal concentration (96 h LC50, 0.056 mg/L) of this chemical, fish were exposed to three doses (0.001, 0.01, and 0.02 mg/L) and sampled on days 7, 14, 21 and 28 after the initiation of a subchronic toxicity test. The levels of superoxide dismutase (SOD), catalase (CAT), malondialdehyde (MDA), glutathione S-transferase (GST), reactive oxygen species (ROS) and DNA damage were determined...
September 6, 2017: Chemosphere
https://www.readbyqxmd.com/read/28898780/characteristics-of-pcdds-pcdfs-in-stack-gas-from-medical-waste-incinerators
#15
Young Wook Yoon, Tae-Wan Jeon, Jun-Ik Son, Kyu-Yeon Kim, Eun-Hye Kwon, Sun-Kyoung Shin, Jun-Gu Kang
Toxic polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) in 45 stack gas samples were measured from 19 medical waste incinerators in South Korea using high-resolution gas chromatography equipped with a high-resolution mass spectrometer. The average concentrations of the sum of 17 toxic PCDD/PCDF congeners emitted from the medical waste incinerators ranged from 0.153 to 101.9 ng/Sm(3). Based on the World Health Organization toxic equivalency factor, they ranged from 0.007 to 5...
September 6, 2017: Chemosphere
https://www.readbyqxmd.com/read/28898776/effect-of-electro-activated-solutions-of-sodium-acetate-and-sodium-propionate-on-geosmin-producing-streptomyces-avermitilis-strain
#16
Viacheslav Liato, Mohammed Aïder
Electro-activated solutions of salts of weak organic acids are defined as novel potent disinfecting agents that can be used in the agri-food industry. The aim of the present work is to study and understand the destruction mechanism of electro-activated solutions of sodium acetate (EAA) and sodium propionate (EAP) against Streptomyces avermitilis spores. The results of antibacterial activity showed high bacteriostatic effect for all the tested solutions, including sodium hypochlorite used as positive control...
September 6, 2017: Chemosphere
https://www.readbyqxmd.com/read/28898773/increased-accumulation-of-pb-and-cd-from-contaminated-soil-with-scirpus-triqueter-by-the-combined-application-of-nta-and-apg
#17
Xiaoxin Hu, Xiaoyan Liu, Xinying Zhang, Liya Cao, Jing Chen, Hang Yu
Phytoremediation of heavy metals contaminated soils shows many advantages and it can be improved by adding chelating agents and surfactants. In this study, pot culture experiments were set up to explore the effect of alone application of nitrilotriacetic acid (NTA) and combined application of NTA and alkyl polyglucoside (APG) on changes in absorption and adsorption of heavy metals by root of Scirpus triqueter and bioaccumulation of metals in single or co-contamination. Different additives were added into the soils artificially after 10 d and heavy metals extracted from different plant tissues were analyzed after 60 d...
September 6, 2017: Chemosphere
https://www.readbyqxmd.com/read/28888860/natural-soil-mediated-photo-fenton-like-processes-in-treatment-of-pharmaceuticals-batch-and-continuous-approach
#18
Rahil Changotra, Himadri Rajput, Amit Dhir
This paper manifests the potential viability of soil as a cost-free catalyst in photo-Fenton-like processes for treating pharmaceuticals at large scale. Naturally available soil without any cost intensive modification was utilized as a catalyst to degrade pharmaceuticals, specifically ornidazole (ORZ) and ofloxacin (OFX). Soil was characterized and found enriched with various iron oxides like hematite, magnetite, goethite, pyrite and wustite, which contributes toward enhanced dissolution of Fe(3+) than Fe(2+) in the aqueous solution resulting in augmented rate of photo-Fenton reaction...
September 6, 2017: Chemosphere
https://www.readbyqxmd.com/read/28898779/ozone-cathode-microbial-desalination-cell-an-innovative-option-to-bioelectricity-generation-and-water-desalination
#19
Abdolmajid Gholizadeh, Ali Asghar Ebrahimi, Mohammad Hossein Salmani, Mohammad Hassan Ehrampoush
Microbial desalination cell (MDC) is a new approach of water desalination methods, which is based on ionic species removal from water in proportion to the electric current generated by bacteria. However, the low current generation and insufficient deionization in this technology have created challenges to improve the process. Here, the performance of MDC using ozone as a new electron acceptor (O3-MDC) was evaluated versus another operated independently with oxygen (O2-MDC). Results showed the maximum open-circuit voltages of 628 and 1331 mV for 20 g L(-1) NaCl desalination in O2-MDC and O3-MDC, respectively...
September 4, 2017: Chemosphere
https://www.readbyqxmd.com/read/28898777/different-impacts-of-manure-and-chemical-fertilizers-on-bacterial-community-structure-and-antibiotic-resistance-genes-in-arable-soils
#20
Peng Liu, Shuyu Jia, Xiwei He, Xuxiang Zhang, Lin Ye
Both manure and chemical fertilizers are widely used in modern agriculture. However, the impacts of different fertilizers on bacterial community structure and antibiotic resistance genes (ARGs) in arable soils still remain unclear. In this study, high-throughput sequencing and quantitative PCR were employed to investigate the bacterial community structure, ARGs and mobile genetic elements (MGEs) influenced by the application of different fertilizers, including chemical fertilizers, piggery manure and straw ash...
September 4, 2017: Chemosphere
journal
journal
22771
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"