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https://www.readbyqxmd.com/read/29334637/contamination-characteristics-and-source-apportionment-of-heavy-metals-in-topsoil-from-an-area-in-xi-an-city-china
#1
Xiuduan Chen, Xinwei Lu
As soil-extractable elements potentially pose ecological and health risks, identifying their contamination characteristics and sources is crucial. Therefore, to understand topsoil trace elements in the urban ring zone from the Second Ring Road to the Third Ring of Xi'an city in China, we determined the concentrations of Zn, Co, V, As, Cu, Mn, Ba, Ni and Pb, and analyzed the sources of the contamination. The results showed that the individual pollution indices of Pb, Co, Cu, Zn, Ba, Ni, Mn, As, and V were 1...
January 11, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29332277/efficient-degradation-of-triclosan-by-an-endophytic-fungus-penicillium-oxalicum-b4
#2
Hao Tian, Yan Jun Ma, Wan Yi Li, Jian Wen Wang
Triclosan (TCS), a widely used antimicrobial and preservative agent, is an emerging contaminant in aqueous and soil environment. Microbial degradation of TCS has not been reported frequently because of its inhibition of microbe growth. To explore the new microbial resources for TCS biodegradation, fungal endophytes were isolated and screened for the degradation potential. The endophytic strain B4 isolated from Artemisia annua L. showed higher degradation efficiency and was identified as Penicillium oxalicum based on its morphology and ITS sequences of ribosomal DNA...
January 13, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29331851/rhizospheric-microorganisms-as-a-solution-for-the-recovery-of-soils-contaminated-by-petroleum-a-review
#3
REVIEW
Jéssica Janzen Dos Santos, Leila Teresinha Maranho
Petroleum is currently the world's main energy source, and its demand is expected to increase in coming years. Its intense exploitation can lead to an increase in the number of environmental accidents, such as spills and leaks, and an increase in the generation of environmental liabilities resulting from refining. Due to its hydrophobic characteristics and slow process of biodegradation, petroleum can remain in the environment for a long time and its toxicity can cause a negative impact on both terrestrial and aquatic ecosystems, with the main negative effects related to its carcinogenic potential for both animals and humans...
January 11, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/29331717/in%C3%A2-vitro-dermal-bioaccessibility-of-selected-metals-in-contaminated-soil-and-mine-tailings-and-human-health-risk-characterization
#4
Laura T Chaparro Leal, Mert Guney, Gerald J Zagury
Dermal exposure to contaminated sites has generally received less attention than oral/inhalation exposure due to limited exposure scenarios and less perceived potential for toxicity, however, the risk can be significant for specific contaminants and scenarios. The present study aims to (1) measure Cr, Ni, Pb, and Zn contamination in soil and mine tailings samples (n = 7), (2) determine the dermal bioaccessibility of these metals via in vitro tests using two synthetic sweat formulations (EN 1811; NIHS 96-10), and (3) obtain dermal absorbed doses (DADs) for children's and adults' exposure scenarios and compare them to derived dermal reference values...
January 4, 2018: Chemosphere
https://www.readbyqxmd.com/read/29331716/bioremediation-of-cadmium-and-zinc-contaminated-soil-using-rhodobacter-sphaeroides
#5
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/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
#6
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/29330898/determination-of-phthalate-esters-in-soil-using-a-quick-easy-cheap-effective-rugged-and-safe-method-followed-by-gc-ms
#7
Qianjun Liu, Di Chen, Jiyuan Wu, Guangcai Yin, Qintie Lin, Min Zhang, Huawen Hu
A quick, easy, cheap, effective, rugged, and safe procedure was designed to extract pesticide residues from fruits and vegetables with a high percentage of water. It has not been used extensively for the extraction of phthalate esters from sediments, soils and sludges. In this work, this procedure was combined with gas chromatography with mass spectrometry to determine 16 selected phthalate esters in soil. The extraction efficiency of the samples was improved by ultrasonic extraction and dissolution of the soil samples in ultra-pure water, which promoted the dispersion of the samples...
January 13, 2018: Journal of Separation Science
https://www.readbyqxmd.com/read/29330821/effects-of-ferrous-sulfate-amendment-and-water-management-on-rice-growth-and-metal-loid-accumulation-in-arsenic-and-lead-co-contaminated-soil
#8
Lina Zou, Shu Zhang, Dechao Duan, Xinqiang Liang, Jiyan Shi, Jianming Xu, Xianjin Tang
Arsenic (As) and lead (Pb) commonly co-exist with high concentrations in paddy soil mainly due to human activities in south of China. This study investigates the effect of ferrous sulfate (FeSO4) amendment and water management on rice growth and arsenic (As) and lead (Pb) accumulation in rice plants. A paddy soil co-contaminated with As and Pb was chosen for the pot experiment with three FeSO4 levels (0, 0.25, and 1%, on a dry weight basis) and two water managements (flooded, non-flooded). The concentrations of As and Pb in iron plaques and rice plants were determined...
January 12, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29330814/contrasting-effects-of-alkaline-amendments-on-the-bioavailability-and-uptake-of-cd-in-rice-plants-in-a-cd-contaminated-acid-paddy-soil
#9
Jun Meng, Libin Zhong, Lu Wang, Xingmei Liu, Caixian Tang, Hongjin Chen, Jianming Xu
Reducing cadmium (Cd) concentrations in rice grains is important for food safety, particularly in acid paddy fields in South China where the soils have been previously contaminated with Cd. A field experiment was conducted to evaluate the effects of four alkaline amendments, i.e., lime, compost, biochar, and carbide slag on soil bioavailability and uptake of Cd in plants of two rice cultivars (Oryza sativa L.) in a Cd-contaminated acid paddy soil. The addition of these amendments significantly decreased the concentrations of CaCl2-extractable Cd by 13-41%...
January 12, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29330533/soil-contamination-alters-the-willow-root-and-rhizosphere-metatranscriptome-and-the-root-rhizosphere-interactome
#10
Etienne Yergeau, Julien Tremblay, Simon Joly, Michel Labrecque, Christine Maynard, Frederic E Pitre, Marc St-Arnaud, Charles W Greer
Phytoremediation using willows is thought to be a sustainable alternative to traditional remediation techniques involving excavation, transport, and landfilling. However, the complexity of the interaction between the willow and its associated highly diverse microbial communities makes the optimization of phytoremediation very difficult. Here, we have sequenced the rhizosphere metatranscriptome of four willow species and the plant root metatranscriptome for two willow species growing in petroleum hydrocarbon-contaminated and non-contaminated soils on a former petroleum refinery site...
January 12, 2018: ISME Journal
https://www.readbyqxmd.com/read/29329939/enhanced-mobility-of-non-aqueous-phase-liquid-napl-during-drying-of-wet-sand
#11
Dhivakar Govindarajan, Abhijit P Deshpande, Ravikrishna Raghunathan
Enhanced upward mobility of a non aqueous phase liquid (NAPL) present in wet sand during natural drying, and in the absence of any external pressure gradients, is reported for the first time. This mobility was significantly higher than that expected from capillary rise. Experiments were performed in a glass column with a small layer of NAPL-saturated sand trapped between two layers of water-saturated sand. Drying of the wet sand was induced by flow of air across the top surface of the wet sand. The upward movement of the NAPL, in the direction of water transport, commenced when the drying effect reached the location of the NAPL and continued as long as there was significant water evaporation in the vicinity of NAPL, indicating a clear correlation between the NAPL rise and water evaporation...
January 4, 2018: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/29329087/occurrence-of-perfluoroalkyl-substances-pfas-in-garden-produce-at-homes-with-a-history-of-pfas-contaminated-drinking-water
#12
Deanna P Scher, James E Kelly, Carin A Huset, Kitrina M Barry, Richard W Hoffbeck, Virginia L Yingling, Rita B Messing
The decades-long disposal of manufacturing waste containing perfluoroalkyl substances (PFAS) in landfills resulted in contamination of groundwater serving as the drinking water supply for the eastern Twin Cities metropolitan region. While measures were taken to reduce the levels of PFAS in the drinking water, questions remained about possible non-drinking water pathways of exposure in these communities. The Minnesota Department of Health (MDH) investigated whether PFAS in water used for yard and garden irrigation results in elevated concentrations of PFAS in soil and home-grown produce...
December 29, 2017: Chemosphere
https://www.readbyqxmd.com/read/29327189/using-a-high-organic-matter-biowall-to-treat-a-trichloroethylene-plume-at-the-beaver-dam-road-landfill
#13
Gabriela T Niño de Guzmán, Cathleen J Hapeman, Patricia D Millner, Laura L McConnell, Dana Jackson, David Kindig, Alba Torrents
Trichloroethylene (TCE) is a highly effective industrial degreasing agent and known carcinogen. It was frequently buried improperly in landfills and has subsequently become one of the most common groundwater and soil contaminants in the USA. A common strategy to remediate TCE-contaminated sites and to prevent movement of the TCE plumes into waterways is to construct biowalls which consist of biomaterials and amendments to enhance biodegradation. This approach was chosen to contain a TCE plume emanating from a closed landfill in Maryland...
January 11, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29324691/physiological-and-comparative-genomic-analysis-of-arthrobacter-sp-srs-w-1-2016-provides-insights-on-niche-adaptation-for-survival-in-uraniferous-soils
#14
Ashvini Chauhan, Ashish Pathak, Rajneesh Jaswal, Bobby Edwards Iii, Demario Chappell, Christopher Ball, Reyna Garcia-Sillas, Paul Stothard, John Seaman
Arthrobacter sp. strain SRS-W-1-2016 was isolated on high concentrations of uranium (U) from the Savannah River Site (SRS) that remains co-contaminated by radionuclides, heavy metals, and organics. SRS is located on the northeast bank of the Savannah River (South Carolina, USA), which is a U.S. Department of Energy (DOE) managed ecosystem left historically contaminated from decades of nuclear weapons production activities. Predominant contaminants within the impacted SRS environment include U and Nickel (Ni), both of which can be transformed microbially into less toxic forms via metal complexation mechanisms...
January 11, 2018: Genes
https://www.readbyqxmd.com/read/29324565/assessment-of-child-lead-exposure-in-a-philadelphia-community-2014
#15
Timothy Dignam, Ana Pomales, Lora Werner, E Claire Newbern, James Hodge, Jay Nielsen, Aaron Grober, Karen Scruton, Rand Young, Jack Kelly, Mary Jean Brown
INTRODUCTION: Several urban neighborhoods in Philadelphia, Pennsylvania, have a history of soil, household lead paint, and potential lead-emitting industry contamination. OBJECTIVES: To (1) describe blood lead levels (BLLs) in target neighborhoods, (2) identify risk factors and sources of lead exposure, (3) describe household environmental lead levels, and (4) compare results with existing data. METHODS: A simple, random, cross-sectional sampling strategy was used to enroll children 8 years or younger living in selected Philadelphia neighborhoods with a history of lead-emitting industry during July 2014...
January 10, 2018: Journal of Public Health Management and Practice: JPHMP
https://www.readbyqxmd.com/read/29324386/effects-of-two-ecological-earthworm-species-on-atrazine-degradation-performance-and-bacterial-community-structure-in-red-soil
#16
Zhong Lin, Zhen Zhen, Lei Ren, Jiewen Yang, Chunling Luo, Laiyuan Zhong, Hanqiao Hu, Yanqiu Liang, Yongtao Li, Dayi Zhang
Vermicomposting is an effective and environmentally friendly approach for eliminating soil organic contamination. Atrazine is one of the most commonly applied triazinic herbicides and frequently detected in agricultural soils. This study investigated the roles and mechanisms of two earthworm species (epigeic Eisenia foetida and endogeic Amynthas robustus) in microbial degradation of atrazine. Both earthworms accelerated atrazine degradation performance from 39.0% in sterile soils to 94.9%-95.7%, via neutralizing soil pH, consuming soil humus, altering bacterial community structure, enriching indigenous atrazine degraders and excreting the intestinal atrazine-degrading bacteria...
December 29, 2017: Chemosphere
https://www.readbyqxmd.com/read/29324285/lithium-as-an-emerging-environmental-contaminant-mobility-in-the-soil-plant-system
#17
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
https://www.readbyqxmd.com/read/29323896/different-proteomic-processes-related-to-the-cultivar-dependent-cadmium-accumulation-of-amaranthus-gangeticus
#18
Chun-Tao He, Yihui Zhou, Ying-Ying Huang, Hui-Ling Fu, Xue-Song Wang, Fei-Yue Gong, Xiao Tan, Zhongyi Yang
To deal with the Cd-contaminant of agricultural soil, pollution-safe cultivar (PSC) is developed to minimize Cd accumulation risk in crops. The present study aimed to investigate the different proteomic responses related to Cd accumulation in different tissue between two Amaranthus gangeticus cultivars, Pen and Nan. Significant higher Cd accumulation in Pen than in Nan was unraveled, especially in shoot. The proportions of soluble Cd in root and stem of Nan were significantly lower than those of Pen, implying lower Cd transportation from root to shoot in Nan...
January 11, 2018: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29322391/feet-in-danger-short-exposure-to-contaminated-soil-causing-health-damage-an-experimental-study
#19
Flavio Manoel Rodrigues da Silva Júnior, Edlaine Acosta Pinto, Tatiane Britto da Silveira, Edariane Menestrino Garcia, Adriane Maria Netto de Oliveira, Ana Luíza Muccillo-Baisch
In this study, hematological and behavioral changes in Wistar rats exposed to soil collected from urban areas next to an industrial complex were investigated. Animals were exposed to soil samples placed at the bottom of cages for 4 days. After this period, behavioral parameters were measured by the open field test and the elevated plus-maze. Blood was collected to measure hematological parameters. The soil from the vicinity of the oil refining industry caused changes in hematological parameters and altered behavioral parameters in both tests...
January 10, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29322098/diuron-degradation-by-bacteria-from-soil-of-sugarcane-crops
#20
Tassia C Egea, Roberto da Silva, Maurício Boscolo, Janaina Rigonato, Diego A Monteiro, Danilo Grünig, Humberto da Silva, Frans van der Wielen, Rick Helmus, John R Parsons, Eleni Gomes
The isolation of microorganisms from soil impacted by xenobiotic chemicals and exposing them in the laboratory to the contaminant can provide important information about their response to the contaminants. The purpose of this study was to isolate bacteria from soil with historical application of herbicides and to evaluate their potential to degrade diuron. The isolation media contained either glucose or diuron as carbon source. A total of 400 bacteria were isolated, with 68% being Gram-positive and 32% Gram-negative...
December 2017: Heliyon
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