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Chemosphere

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https://www.readbyqxmd.com/read/29335230/application-of-a-health-risk-assessment-model-for-cattle-exposed-to-pesticides-in-contaminated-drinking-waters-a-study-case-from-the-pampas-region-argentina
#1
Sabrina Dubny, Fabio Peluso, Ignacio Masson, Natalia Othax, José González Castelain
Using the USEPA methodology we estimated the probabilistic chronic risks for calves and adult cows due to pesticide exposure through oral intake of contaminated surface and ground waters in Tres Arroyos County (Argentina). Because published data on pesticide toxicity endpoints for cows are scarce, we used threshold levels based on interspecies extrapolation methods. The studied waters showed acceptable quality for cattle production since none of the pesticides were present at high-enough concentrations to potentially affect cow health...
January 12, 2018: Chemosphere
https://www.readbyqxmd.com/read/29334650/environmentally-relevant-concentrations-of-glibenclamide-induce-oxidative-stress-in-common-carp-cyprinus-carpio
#2
Ericka María Guadalupe Martínez-Viveros, Hariz Islas-Flores, Octavio Dublán-García, Marcela Galar-Martínez, Nely SanJuan-Reyes, Sandra García-Medina, María Dolores Hernández-Navarro, Leobardo Manuel Gómez-Oliván
The hypoglycemic pharmaceutical glibenclamide (GLB) is widely used around the world. This medication is released into the environment by municipal, hospital and industrial wastewater discharges. Although there are reports of its environmental occurrence in the scientific literature, toxicity studies on aquatic species of commercial interest such as the common carp Cyprinus carpio are scarce. The present study aimed to evaluate the oxidative stress induced on C. carpio by environmentally relevant concentrations of GLB...
January 12, 2018: Chemosphere
https://www.readbyqxmd.com/read/29331719/regulated-effects-of-prorocentrum-donghaiense-lu-exudate-on-nickel-bioavailability-when-cultured-with-different-nitrogen-sources
#3
Xu-Guang Huang, Shun-Xing Li, Feng-Jiao Liu, Wang-Rong Lan
Exudates by marine phytoplankton and metals coexist in the seawater, but little is known about their interaction. In this study, cultures of Prorocentrum donghaiense Lu were grown in urea and ammonium, and then exposed to different Ni ion levels in order to study the effects of Ni ions on algal growth. The regulatory mechanisms of P. donghaiense Lu for coping with different Ni ion levels was investigating by characterizing dissolved organic carbon (DOC), carbohydrate and protein content released per cell, hydropathy properties (hydrophilic and hydrophobic fractions) and thiol compounds (cysteine-like or glutathione-like)...
January 10, 2018: Chemosphere
https://www.readbyqxmd.com/read/29334653/depletion-study-withdrawal-period-calculation-and-bioaccumulation-of-sulfamethazine-in-tilapia-oreochromis-niloticus-treated-with-medicated-feed
#4
Kátia S D Nunes, José H Vallim, Márcia R Assalin, Sonia C N Queiroz, Lourival C Paraíba, Claudio M Jonsson, Felix G R Reyes
The residue depletion of sulfamethazine (SMZ) was evaluated in tilapia (Oreochromis niloticus) after 11 days of administration of medicated feed containing SMZ, at the dose of 422 mg/kg body weight (bw). The determination of SMZ in feed and tilapia fillet was carried out using the QuEChERS approach for sample preparation, and high performance liquid chromatography with diode array detector (HPLC-DAD) and ultra-high performance liquid chromatography-quadrupole time-of-flight mass spectrometry (UPLC-QToF-MS) for quantitation, respectively...
January 9, 2018: Chemosphere
https://www.readbyqxmd.com/read/29331934/characterization-and-release-profile-of-mn-al-bearing-deposits-in-drinking-water-distribution-systems
#5
Guiwei Li, Yuanxun Ding, Hongfu Xu, Junwei Jin, Baoyou Shi
Inorganic contaminants accumulation in drinking water distribution systems (DWDS) is a great threat to water quality and safety. This work assessed the main risk factors for different water pipes and discovered the release profile of accumulated materials in a full scale distribution system frequently suffered from water discoloration problem. Physicochemical characterization of pipe deposits were performed using X-ray fluorescence, scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy...
January 9, 2018: Chemosphere
https://www.readbyqxmd.com/read/29331933/combined-effects-of-ag-and-uio-66-for-removal-of-elemental-mercury-from-flue-gas
#6
Songjian Zhao, Dongyao Chen, Haomiao Xu, Jian Mei, Zan Qu, Ping Liu, Yong Cui, Naiqiang Yan
The zirconium metal-organic framework material UiO-66 was doped with Ag nanoparticles and investigated for the removal of elemental mercury (Hg0) in flue gas. Physical and chemical characterization of the adsorbents showed that adding Ag did not change the crystal structure and morphology of the UiO-66. Ag doping can improve the redox activity of UiO-66, and the adsorbent exhibited high thermal stability and surface area. Hg0 removal experiments indicated that UiO-66 exhibited the higher performance compared with P25 and activated carbon, and the addition of Ag exhibited a significant synergistic effect with the UiO-66, which had highest Hg0 adsorption capacity (3...
January 9, 2018: Chemosphere
https://www.readbyqxmd.com/read/29328987/total-mercury-content-in-commercial-swordfish-xiphias-gladius-from-different-fao-fishing-areas
#7
Mauro Esposito, Antonella De Roma, Raffaella La Nucara, Giuseppe Picazio, Pasquale Gallo
Mercury (Hg) is a global pollutant that affect human and ecosystem health. It is transferred through trophic level and bio magnification in the food chain. In this study, total Hg was measured in the muscular tissue of samples of swordfish (Xiphias gladius) from different FAO fishing areas and imported in Italy between 2014 and 2017. Total mercury concentrations of muscular tissues were determined using cold vapour atomic absorption spectrometry. In order to assess the health risk associated with human consumption of this fish, the Hg intake values were calculated and compared with those of provisional tolerable daily intake (PTDI) (0...
January 9, 2018: Chemosphere
https://www.readbyqxmd.com/read/29339274/geochemical-sources-of-metal-contamination-in-a-coal-mining-area-in-chhattisgarh-india-using-lead-isotopic-ratios
#8
Avijit Das, Subhra Sarita Patel, Rajeev Kumar, K V S S Krishna, Saikat Dutta, Manik Chandra Saha, Siladitya Sengupta, Dipayan Guha
A geochemical study of the trace metals and lead isotopic ratios of soil and sediments in Korba, Chhattisgarh, India is presented here for the first time. Korba, the nation's 'power hub' is also the fifth among its eighty-eight most critically polluted industrial hotspots. A very high mean concentration (in mg kg-1) of V (308), Cr (567), Mn (3442), Co (92), Cu (218), Zn (426), Pb (311), Th (123) and U (32) characterized the sediments of the studied area with mean Igeo values of the trace metals ranging from -2...
January 8, 2018: Chemosphere
https://www.readbyqxmd.com/read/29334654/phbv-polymer-supported-denitrification-system-efficiently-treated-high-nitrate-concentration-wastewater-denitrification-performance-microbial-community-structure-evolution-and-key-denitrifying-bacteria
#9
Zhongshuo Xu, Liyan Song, Xiaohu Dai, Xiaoli Chai
Biodegradable polymer supported denitrification (BPD) system shows good denitrification performance for the wastewater with low nitrate concentrations. In this study, a BPD system using Poly (3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) polymer as carbon source was developed to treat the wastewater with high nitrate concentrations. The denitrification performance, utilization ratio of PHBV polymers, and microbial community structure evolution and key denitrifying bacteria were comprehensively studied. Results indicated that an average nitrate removal efficiency of 99% could be achieved with an influent NO3--N concentration of 100 mg L-1 and a hydraulic retention time (HRT) of 7...
January 8, 2018: Chemosphere
https://www.readbyqxmd.com/read/29334651/effects-of-perinatal-fluoride-exposure-on-the-expressions-of-mir-124-and-mir-132-in-hippocampus-of-mouse-pups
#10
Jixiang Wang, Yuliang Zhang, Zhenzhen Guo, Rui Li, Xingchen Xue, Zilong Sun, Ruiyan Niu
To investigate the effects of perinatal fluoride exposure on learning and memory ability of mouse offspring, ICR female mice were received different doses of sodium fluoride (0, 25, 50, 100 mg/L NaF) from pregnant day 7 to lactational day 21. Pups were exposed to fluoride through the cord blood and breast milk. Open field test showed that compared to the control group, perinatal fluoride exposure significantly decreased the number of entries into the center zone in 100 mg/L NaF group. In the eight-arm maze test, the number of working memory errors, reference memory errors, and the total arm entries were significantly increased in fluoride treatment groups, compared to the control group...
January 8, 2018: Chemosphere
https://www.readbyqxmd.com/read/29331715/toxicokinetics-of-zn-and-cd-in-the-earthworm-eisenia-andrei-exposed-to-metal-contaminated-soils-under-different-combinations-of-air-temperature-and-soil-moisture-content
#11
M Nazaret González-Alcaraz, Susana Loureiro, Cornelis A M van Gestel
This study evaluated how different combinations of air temperature (20 °C and 25 °C) and soil moisture content (50% and 30% of the soil water holding capacity, WHC), reflecting realistic climate change scenarios, affect the bioaccumulation kinetics of Zn and Cd in the earthworm Eisenia andrei. Earthworms were exposed for 21 d to two metal-contaminated soils (uptake phase), followed by 21 d incubation in non-contaminated soil (elimination phase). Body Zn and Cd concentrations were checked in time and metal uptake (k1) and elimination (k2) rate constants determined; metal bioaccumulation factor (BAF) was calculated as k1/k2...
January 8, 2018: Chemosphere
https://www.readbyqxmd.com/read/29328988/carboxymethyl-cellulose-stabilized-zno-biochar-nanocomposites-enhanced-adsorption-and-inhibited-photocatalytic-degradation-of-methylene-blue
#12
Shengsen Wang, Yanxia Zhou, Shuwen Han, Nong Wang, Weiqin Yin, Xianqiang Yin, Bin Gao, Xiaozhi Wang, Jun Wang
Biochar(BC)-supported nanoscaled zinc oxide (nZO) was encapsulated either with (nZORc/BC) or with no (nZOR/BC) sodium carboxymethyl cellulose (CMC). The X-ray diffraction and ultraviolet (UV)-visible-near infrared spectrophotometry revealed that nZO of 16, 10, and 20 nm with energy band gaps of 2.79, 3.68 and 2.62 eV were synthesized for nZOR/BC, nZORc/BC and nZO/BC, respectively. The Langmuir isotherm predicted saturated sorption of methylene blue (MB) was 17.01 g kg-1 for nZORc/BC, over 19 times greater than nZOR/BC and nZO/BC...
January 8, 2018: Chemosphere
https://www.readbyqxmd.com/read/29339273/electrolyte-selection-and-microbial-toxicity-for-electrochemical-oxidative-water-treatment-using-a-boron-doped-diamond-anode-to-support-site-specific-contamination-incident-response
#13
Rebecca B Phillips, Ryan R James, Matthew L Magnuson
Intentional and unintentional contamination incidents, such as terrorist attacks, natural disasters, and accidental spills, can result in large volumes of contaminated water. These waters may require pre-treatment before disposal and assurances that treated waters will not adversely impact biological processes at wastewater treatment facilities, or receiving waters. Based on recommendations of an industrial workgroup, this study addresses such concerns by studying electrochemical advanced oxidation process (EAOP) pre-treatment for contaminated waters, using a boron-doped diamond (BDD) anode, prior to discharge to wastewater treatment facilities...
January 6, 2018: Chemosphere
https://www.readbyqxmd.com/read/29331718/partition-of-zn-cd-and-pb-during-co-combustion-of-sedum-plumbizincicola-and-sewage-sludge
#14
Feihong Guo, Zhaoping Zhong, Hui Xue
Co-combustion of sedum plumbizincicola and sewage sludge was performed in a tubular furnace. The influence of experimental conditions on the partitioning of Zn, Cd, and Pb was investigated. The results showed that 30% sewage sludge was proposed as the optimal ratio for the co-combustion as a compromise between low calorific value and high amount of heavy metal remained in the bottom ash. High temperature increased the volatilization degree of heavy metals, among which the performance of Cd and Pb was obvious than Zn...
January 6, 2018: Chemosphere
https://www.readbyqxmd.com/read/29331716/bioremediation-of-cadmium-and-zinc-contaminated-soil-using-rhodobacter-sphaeroides
#15
Weihua Peng, Xiaomin Li, Jingxiang Song, Wei Jiang, Yingying Liu, Wenhong Fan
Bioremediation using microorganisms is a promising technique to remediate soil contaminated with heavy metals. In this study, Rhodobacter sphaeroides was used to bioremediate soils contaminated with cadmium (Cd) and zinc (Zn). The study found that the treatment reduced the overall bioavailable fractions (e.g., exchangeable and carbonate bound phases) of Cd and Zn. More stable fractions (e.g., Fe-Mn oxide, organic bound, and residual phases (only for Zn)) increased after bioremediation. A wheat seedling experiment revealed that the phytoavailability of Cd was reduced after bioremediation using R...
January 6, 2018: Chemosphere
https://www.readbyqxmd.com/read/29329084/sources-of-polychlorinated-dibenzo-p-dioxins-and-dibenzofurans-and-biphenyls-in-chinese-mitten-crabs
#16
Ying Han, Wenbin Liu, Wen Zhu, Kaifeng Rao, Ke Xiao, Lirong Gao, Guijin Su, Guorui Liu
Polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) and polychlorinated biphenyls (PCBs) in Chinese mitten crabs from several areas were determined. The toxic equivalents (TEQs) for the mean PCDD/F and total PCDD/F and dioxin-like PCBs were 2.9 ± 2.7 and 5.7 ± 4.0 pg TEQ g-1, respectively. The mean concentrations of PCBs and dl-PCBs were 282 and 59 times the concentrations of PCDD/Fs, respectively. PCDD/F and PCB sources in the crab food web were assessed. The total TEQ of PCDD/F and PCB supplied by crab compound feed was 2...
January 6, 2018: Chemosphere
https://www.readbyqxmd.com/read/29329081/presence-of-fe-al-binary-oxide-adsorbent-cake-layer-in-ceramic-membrane-filtration-and-their-impact-for-removal-of-ha-and-bsa
#17
Kyung-Jo Kim, Am Jang
To enhance the removal of natural organic matter (NOM) in ceramic (Ce) membrane filtration, an iron-aluminum binary oxide (FAO) was applied to the ceramic membrane surface as the adsorbent cake layer, and it was compared with heated aluminum oxide (HAO) for the evaluation of the control of NOM. Both the HAO and FAO adsorbent cake layers efficiently removed the NOM regardless of NOM's hydrophobic/hydrophilic characteristics, and the dissolved organic carbon (DOC) removal in NOM for FAO was 1-1.12 times greater than that for HAO, which means FAO was more efficient in the removal of DOC in NOM...
January 5, 2018: Chemosphere
https://www.readbyqxmd.com/read/29328989/inhibition-of-udp-glucuronosyltransferases-ugts-by-phthalate-monoesters
#18
Zuo Du, Yun-Feng Cao, Sai-Nan Li, Cui-Min Hu, Zhi-Wei Fu, Chun-Ting Huang, Xiao-Yu Sun, Yong-Zhe Liu, Kun Yang, Zhong-Ze Fang
Phthalate monoesters are important metabolites of phthalate esters (PAEs) which have been extensively utilized in industry. This study aims to investigate the inhibition of phthalate monoesters on the activity of various isoforms of UDP-glucuronosyltransferases (UGTs), trying to elucidate the toxicity mechanism of environmental endocrine disruptors from the new perspectives. In vitro recombinant UGTs-catalyzed glucuronidation of 4-methylumbelliferone (4-MU) was employed to evaluate 8 kinds of phthalate monoesters on 11 sorts of main human UGT isoforms...
January 5, 2018: Chemosphere
https://www.readbyqxmd.com/read/29324383/the-influence-of-algal-organic-matter-produced-by-microcystis-aeruginosa-on-coagulation-ultrafiltration-treatment-of-natural-organic-matter
#19
Jie Xu, Yanxia Zhao, Baoyu Gao, Songlin Han, Qian Zhao, Xiaoli Liu
Cyanobacterial bloom causes the release of algal organic matter (AOM), which inevitably affects the treatment processes of natural organic matter (NOM). This study works on treating micro-polluted surface water (SW) by emerging coagulant, namely titanium sulfate (Ti(SO4)2), followed by Low Pressure Ultrafiltration (LPUF) technology. In particular, we explored the respective influence of extracellular organic matter (EOM) and intracellular organic matter (IOM) on synergetic EOM-NOM/IOM-NOM removal, functional mechanisms and subsequent filtration performance...
January 5, 2018: Chemosphere
https://www.readbyqxmd.com/read/29324285/lithium-as-an-emerging-environmental-contaminant-mobility-in-the-soil-plant-system
#20
Brett H Robinson, Rohith Yalamanchali, René Reiser, Nicholas M Dickinson
Contamination of soil with lithium (Li) is likely to increase due to its wider dispersal in the environment, associated in particular, with the disposal of the now ubiquitous Li-ion batteries. There is, however, a paucity of information on the behaviour of Li in the soil-plant system. We measured the sorption of added Li to soil, and uptake of Li by food and fodder species. Around New Zealand, soil concentrations were shown to range from 0.08 mg/kg to 92 mg/kg, and to be positively correlated with clay content...
January 5, 2018: Chemosphere
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