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https://www.readbyqxmd.com/read/28437769/contamination-study-of-forest-track-soils-located-in-a-recreational-area-and-filled-with-steel-industry-waste-30years-ago
#1
Leticia Gómez-Nubla, Julene Aramendia, Silvia Fdez-Ortiz de Vallejuelo, Juan Manuel Madariaga
The reuse of waste is increasingly widespread in order to avoid the exploitation of natural resources and to reduce costs. An example of that reuse is the employment of steel slag, a by-product from the steel making process. When the steel is produced through an electric arc furnace (EAF), two types of slag are generated: black and white slag. One application rarely used for this waste is as filler in forest tracks. In this work, two forest tracks of the Basque Country (northern Spain) filled with black and white slag 19 and 35years ago, respectively, have been studied...
April 21, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28437768/glomeromycota-communities-survive-extreme-levels-of-metal-toxicity-in-an-orphan-mining-site
#2
I Sánchez-Castro, V Gianinazzi-Pearson, J C Cleyet-Marel, E Baudoin, D van Tuinen
Abandoned tailing basins and waste heaps of orphan mining sites are of great concern since extreme metal contamination makes soil improper for any human activity and is a permanent threat for nearby surroundings. Although spontaneous revegetation can occur, the process is slow or unsuccessful and rhizostabilisation strategies to reduce dispersal of contaminated dust represent an option to rehabilitate such sites. This requires selection of plants tolerant to such conditions, and optimization of their fitness and growth...
April 21, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28437740/stabilization-of-metal-loid-s-in-two-contaminated-agricultural-soils-comparing-biochar-to-its-non-pyrolysed-source-material
#3
Lukáš Trakal, Irene Raya-Moreno, Kerry Mitchell, Luke Beesley
Two metal(loid) contaminated agricultural soils were amended with grape stalk (wine production by-product)-derived biochar as well as its pre-pyrolysed origin material, to investigate their geochemical impacts on As, Cr, Cu and Zn. Detailed physico-chemical evaluation combined with a column leaching test determined the retention of metal(loid)s from soil solution by each amendments. A pot experiment measured metal(loid)s in soil pore water and their uptake to ryegrass when the amendments were mixed into soils at 1 and 5% (w/w)...
April 15, 2017: Chemosphere
https://www.readbyqxmd.com/read/28437648/assessing-soil-air-partitioning-of-pahs-and-pcbs-with-a-new-fugacity-passive-sampler
#4
Carey E Donald, Kim A Anderson
Soil-air fluxes of polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs) were determined using a novel application of passive samplers to measure air and soil air, which is air in close proximity and in equilibrium with soil. Existing methods to measure flux of semi-volatile compounds between soil and air require collecting samples from the top soil layer. Yet, the top soil layer is hard to define and oversampling may misrepresent the exchangeable fraction. Alternatively, modified active samplers can measure soil air in situ, but require electricity while deployed...
April 21, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28437647/comparison-of-landfarming-amendments-to-improve-bioremediation-of-petroleum-hydrocarbons-in-niger-delta-soils
#5
David M Brown, Samson Okoro, Juami van Gils, Rob van Spanning, Matthijs Bonte, Tony Hutchings, Olof Linden, Uzoamaka Egbuche, Kim Bye Bruun, Jonathan W N Smith
Large scale landfarming experiments, using an extensive range of treatments, were conducted in the Niger-Delta, Nigeria to study the degradation of oil in contaminated soils. In this work the effect of nutrient addition, biosurfactant, Eisenia fetida (earthworm) enzyme extract, bulking and sorption agents and soil neutralization were tested. It was found that these treatments were successful in removing up to 53% of the total petroleum hydrocarbon in the soil within 16 weeks. A comparison between treatments demonstrated that most were no more effective than agricultural fertilizer addition alone...
April 21, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28437478/metal-accumulation-by-sunflower-helianthus-annuus-l-and-the-efficacy-of-its-biomass-in-enzymatic-saccharification
#6
Saurabh Sudha Dhiman, Xin Zhao, Jinglin Li, Dongwook Kim, Vipin C Kalia, In-Won Kim, Jae Young Kim, Jung-Kul Lee
Accumulation of metal contaminants in soil as a result of various industrial and anthropogenic activities has reduced soil fertility significantly. Phytoextraction of metal contaminants can improve soil fertility and provide inexpensive feedstock for biorefineries. We investigated the hyperaccumulation capacity of sunflower (Helianthus annuus) biomass by cultivating these plants in various concentrations of metal contaminants. Sunflowers were grown in soils contaminated with various levels of heavy metals (10-2,000 mg/kg dry soil)...
2017: PloS One
https://www.readbyqxmd.com/read/28437293/increased-cancer-incidence-in-the-local-population-around-metal-contaminated-glassworks-sites
#7
Fredrik Nyqvist, Ingela Helmfrid, Anna Augustsson, Gun Wingren
OBJECTIVE: The aim of this study was to examine mortality causes and cancer incidence in a population cohort that have resided in close proximity to highly metal-contaminated sources, characterized by contamination of, in particular, arsenic (As), cadmium (Cd), and lead (Pb). METHODS: Data from Swedish registers were used to calculate standardized mortality and cancer incidence ratios. An attempt to relate cancer incidence to metal contamination levels was made...
April 21, 2017: Journal of Occupational and Environmental Medicine
https://www.readbyqxmd.com/read/28436821/hydrological-modeling-of-fecal-indicator-bacteria-in-a-tropical-mountain-catchment
#8
Minjeong Kim, Laurie Boithias, Kyung Hwa Cho, Norbert Silvera, Chanthamousone Thammahacksa, Keooudone Latsachack, Emma Rochelle-Newall, Oloth Sengtaheuanghoung, Alain Pierret, Yakov A Pachepsky, Olivier Ribolzi
The occurrence of pathogen bacteria in surface waters is a threat to public health worldwide. In particular, inadequate sanitation resulting in high contamination of surface water with pathogens of fecal origin is a serious issue in developing countries such as Lao P.D.R. Despite the health implications of the consumption of contaminated surface water, the environmental fate and transport of pathogens of fecal origin and their indicators (Fecal Indicator Bacteria or FIB) are still poorly known in tropical areas...
April 15, 2017: Water Research
https://www.readbyqxmd.com/read/28436692/rhizospheric-soil-enzyme-activities-and-phytominimg-potential-of-aeluropus-lagopoides-and-cyperus-conglomeratus-growing-in-contaminated-soils-at-the-banks-of-artificial-lake-of-reclaimed-wastewater
#9
Zahid Khorshid Abbas
This work investigates the phytoremediation potential of Aeluropus lagopoides and Cyperus conglomeratus, growing indigenously in the vicinity of artificial lake of reclaimed water in Tabuk, Saudi Arabia. The sampling sites were located at different distance from the waste water treatment plants. Trace metal contents were higher in roots than shoots in both these plants. Soil urease activity in rhizophere increased linearly along the sampling sites, however, soil alkaline phosphatase and β-glucosidase activities was greater at site 2 but were declined at site 3...
April 24, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28436673/unique-rhizosphere-micro-characteristics-facilitate-phytoextraction-of-multiple-metals-in-soil-by-the-hyperaccumulating-plant-sedum-alfredii
#10
Dandi Hou, Kai Wang, Ting Liu, Haixin Wang, Zhi Lin, Jie Qian, Lingli Lu, Shengke Tian
Understanding the strategies that the roots of hyperaccumulating plants use to extract heavy metals from soils is important for optimizing phytoremediation. The rhizosphere characteristics of Sedum alfredii, a hyperaccumulator, were investigated 6 months after planting in weathered field soils contaminated with 5.8 μg·g-1 Cd, 1985.1 μg·g-1 Zn, 667.5 μg·g-1 Pb, and 698.8 μg·g-1 Cu. In contrast with the non-hyperaccumulating ecotype (NHE), the hyperaccumulating ecotype (HE) of S. alfredii was more tolerant to the metals and accumulated higher levels of Cd and Zn...
April 24, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28434068/assessment-of-ddt-and-metabolites-in-soil-and-sediment-of-potentially-contaminated-areas-of-bel%C3%A3-m-amazon-region-brazil
#11
Andreia Oliveira Rodrigues, Larissa Costa de Souza, Cássia Christina da Silva Rocha, Amilton Cesar Gomes da Costa, Rosivaldo de Alcântara Mendes
The aim of this study was to evaluate the distribution of DDT and metabolites in surface soils and soil profiles from two areas containing deposits of obsolete pesticides in Belém, Amazon Region, Brazil. DDT and metabolites were extracted by microwave assisted extraction and analyzed by gas chromatography with electron capture detection. Concentrations of total DDT in surface soil samples ranged from 64.22 mg kg(-1) in area 1 (A1) to 447.84 mg kg(-1) in area 2 (A2). Lower levels were found in soil profiles than at the surface (6...
April 22, 2017: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28433930/environmental-electrokinetics-for-a-sustainable-subsurface
#12
REVIEW
A T Lima, A Hofmann, D Reynolds, C J Ptacek, P Van Cappellen, L M Ottosen, S Pamukcu, A Alshawabekh, D M O'Carroll, C Riis, E Cox, D B Gent, R Landis, J Wang, A I A Chowdhury, E L Secord, A Sanchez-Hachair
Soil and groundwater are key components in the sustainable management of the subsurface environment. Source contamination is one of its main threats and is commonly addressed using established remediation techniques such as in-situ chemical oxidation (ISCO), in-situ chemical reduction (ISCR; most notably using zero-valent iron [ZVI]), enhanced in-situ bioremediation (EISB), phytoremediation, soil-washing, pump-and-treat, soil vapour extraction (SVE), thermal treatment, and excavation and disposal. Decades of field applications have shown that these techniques can successfully treat or control contaminants in higher permeability subsurface materials such as sands, but achieve only limited success at sites where low permeability soils, such as silts and clays, prevail...
April 11, 2017: Chemosphere
https://www.readbyqxmd.com/read/28433765/geochemical-processes-controlling-the-distribution-and-concentration-of-metals-in-soils-from-a-patagonian-argentina-salt-marsh-affected-by-mining-residues
#13
Yanina L Idaszkin, María Del Pilar Alvarez, Eleonora Carol
Heavy metal pollution that affects salt marshes is a major environmental concern due to its toxic nature, persistence, and potential risk to organisms and to human health. Mining waste deposits originated four decades ago, by the metallurgical extraction of heavy metals, are found near to the San Antonio salt marsh in Patagonia. The aim of the work was to determine the geochemical processes that control the distribution and concentration of Cu, Fe, Pb and Zn in the soils of this Patagonian salt marsh. A survey of the mining waste deposits was carried out where three dumps were identified...
April 20, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28433208/elucidating-the-fate-of-a-mixed-toluene-dhm-methanol-and-i-propanol-plume-during-in-situ-bioremediation
#14
E Verardo, O Atteia, H Prommer
Organic pollutants such as solvents or petroleum products are widespread contaminants in soil and groundwater systems. In-situ bioremediation is a commonly used remediation technology to clean up the subsurface to eliminate the risks of toxic substances to reach potential receptors in surface waters or drinking water wells. This study discusses the development of a subsurface model to analyse the performance of an actively operating field-scale enhanced bioremediation scheme. The study site was affected by a mixed toluene, dihydromyrcenol (DHM), methanol, and i-propanol plume...
April 6, 2017: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/28432978/cadmium-hampers-salt-tolerance-of-sesuvium-portulacastrum
#15
Mariem Wali, Soledad Martos, Laura Pérez-Martín, Chedly Abdelly, Tahar Ghnaya, Charlotte Poschenrieder, Benet Gunsé
It is well known that salinity reduces cadmium toxicity in halophytes. However, the possible interference of Cd with the mechanisms of salt tolerance is poorly explored. The aim of this study was to see whether Cd affects salt tolerance mechanisms in the halophyte Sesuvium portulacastrum. S. portulacastrum plants obtained from cuttings were grown in hydroponics for 3 weeks and then exposed to low (0.09 mM) or moderate (200 mM) NaCl concentrations, alone or in combination with 25 μM CdCl2. Microscopy observation revealed two strategies of salt tolerance: euhalophytism and secretion of salt by bladder cells...
April 13, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28432977/effect-of-short-term-zn-pb-or-long-term-multi-metal-stress-on-physiological-and-morphological-parameters-of-metallicolous-and-nonmetallicolous-echium-vulgare-l-populations
#16
Sławomir Dresler, Magdalena Wójciak-Kosior, Ireneusz Sowa, Grzegorz Stanisławski, Izabela Bany, Małgorzata Wójcik
The aim of the study was to determine the response of metallicolous and nonmetallicolous Echium vulgare L. populations to chronic multi-metal (Zn, Pb, Cd) and acute Zn (200, 400 μM) and Pb (30, 60 μM) stress. Three populations of E. vulgare, one from uncontaminated and two from metal-contaminated areas, were studied. Two types of experiments were performed - a short-term hydroponic experiment with acute Zn or Pb stress and a long-term manipulative soil experiment with the use of soils from the sites of origin of the three populations...
April 13, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28432972/assessment-of-the-bioavailability-and-depuration-of-uranium-cesium-and-thorium-in-snails-cantareus-aspersus-using-kinetics-models
#17
B Pauget, A Villeneuve, P O Redon, A Cuvier, A de Vaufleury
Uranium ore waste has led to soil contamination that may affect both environmental and soil health. To analyze the risk of metal transfer, metal bioavailability must be estimated by measuring biological parameters. Kinetic studies allow taking into account the dynamic mechanisms of bioavailability, as well as the steady state concentration in organisms necessary to take into account for relevant risk assessment. In this way, this work aims to model the snail accumulation and excretion kinetics of uranium (U), cesium (Cs) and thorium (Th)...
April 7, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28432964/phytate-induced-arsenic-uptake-and-plant-growth-in-arsenic-hyperaccumulator-pteris-vittata
#18
Xue Liu, Jing-Wei Fu, Ni Tang, E B da Silva, Yue Cao, Benjamin L Turner, Yanshan Chen, Lena Q Ma
Phytate is abundant in soils, which is stable and unavailable for plant uptake. However, it occurs in root exudates of As-hyperaccumulator Pteris vittata (PV). To elucidate its effect on As uptake and growth, P. vittata were grown on agar media (63 μM P) containing 50 μM As and/or 50 or 500 μM phytate with non As-hyperaccumulator Pteris ensiformis (PE) as a congeneric control for 60 d. Phytate induced efficient As and P uptake, and enhanced growth in PV, but had little effects on PE. The As concentrations in PV fronds and roots were 157 and 31 mg kg(-1) in As50+phytate50, 2...
April 19, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28432932/surveillance-of-vittaforma-corneae-in-hot-springs-by-a-small-volume-procedure
#19
Jung-Sheng Chen, Tsui-Kang Hsu, Bing-Mu Hsu, Tung-Yi Huang, Yu-Li Huang, Men-Fang Shaio, Dar-Der Ji
Vittaforma corneae is an obligate intracellular fungus and can cause human ocular microsporidiosis. Although accumulating reports of V. corneae causing keratoconjunctivitis in both healthy and immunocompromised persons have been published, little is known about the organism's occurrence in aquatic environments. Limitations in detection sensitivity have meant a large sampling volume is required to detect the pathogen up to now, which is problematic. A recent study in Taiwan has shown that some individuals suffering from microsporidial keratitis (MK) were infected after exposure to the pathogen at a hot spring...
April 19, 2017: Water Research
https://www.readbyqxmd.com/read/28432891/modification-of-an-existing-in%C3%A2-vitro-method-to-predict-relative-bioavailable-arsenic-in-soils
#20
Shane Whitacre, Nicholas Basta, Brooke Stevens, Valerie Hanley, Richard Anderson, Kirk Scheckel
The soil matrix can sequester arsenic (As) and reduces its exposure by soil ingestion. In vivo dosing studies and in vitro gastrointestinal (IVG) methods have been used to predict relative bioavailable (RBA) As. Originally, the Ohio State University (OSU-IVG) method predicted RBA As for soils exclusively from mining and smelting sites with a median of 5,636 mg As kg(-1). The objectives of the current study were to (i) evaluate the ability of the OSU-IVG method to predict RBA As for As contaminated soils with a wider range of As content and As contaminant sources, and (ii) evaluate a modified extraction procedure's ability to improve prediction of RBA As...
April 3, 2017: Chemosphere
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