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https://www.readbyqxmd.com/read/28211339/phytoextraction-of-contaminated-urban-soils-by-panicum-virgatum-l-enhanced-with-application-of-a-plant-growth-regulator-bap-and-citric-acid
#1
Matthew Aderholt, Dale L Vogelien, Marina Koether, Sigurdur Greipsson
Lead (Pb) contamination in soil represents a threat to human health. Phytoextraction has gained attention as a potential alternative to traditional remediation methods because of lower cost and minimal soil disruption. The North American native switchgrass (Panicum virgatum L.) was targeted due to its ability to produce high biomass and grow across a variety of ecozones. In this study switchgrass was chemically enhanced with applications of the soil-fungicide benomyl, chelates (EDTA and citric acid), and PGR to optimize phytoextraction of Pb and zinc (Zn) from contaminated urban soils in Atlanta, GA...
February 4, 2017: Chemosphere
https://www.readbyqxmd.com/read/28191957/towards-financially-viable-phytoextraction-and-production-of-plant-based-palladium-catalysts
#2
Zakuan Azizi Shamsul Harumain, Helen L Parker, Andrea Muñoz García, Michael J Austin, Con Robert McElroy, Andrew J Hunt, James H Clark, John A Meech, Christopher William Noel Anderson, Luca Ciacci, Thomas E Graedel, Neil C Bruce, Elizabeth L Rylott
Although a promising technique, phytoextraction has yet to see significant commercialization. Major limitations include metal uptake rates and subsequent processing costs. However, it has been shown that liquid-culture-grown Arabidopsis can take up and store palladium as nanoparticles. The processed plant biomass has catalytic activity comparable to that of commercially available catalysts, creating a product of higher value than extracted bulk metal. We demonstrate that the minimum level of palladium in Arabidopsis dried tissues for catalytic activity comparable to commercially available 3% palladium-on-carbon catalysts was achieved from dried plant biomass containing between 12 and 18 g·kg-1 Pd...
February 13, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28188207/use-of-endophytic-and-rhizosphere-bacteria-to-improve-phytoremediation-of-arsenic-contaminated-industrial-soils-by-autochthonous-betula-celtiberica
#3
Victoria Mesa, Alejandro Navazas, Ricardo González-Gil, Aida González, Nele Weyens, Béatrice Lauga, Jose Luis R Gallego, Jesús Sánchez, Ana Isabel Peláez
The aim of the study was to investigate the potential of indigenous arsenic-tolerant bacteria to enhance arsenic phytoremediation by autochthonous pseudometallophyte Betula celtiberica The first goal was to perform an initial analysis of the entire rhizosphere and endophytic bacterial communities of the above-named accumulator plant, including the cultivable bacterial species. B. celtiberica's microbiome was dominated by taxa related to Flavobacteriales, Burkholderiales, and Pseudomonadales, specially the Pseudomonas and Flavobacterium genera...
February 10, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28156129/effects-of-citric-acid-and-the-siderophore-desferrioxamine-b-dfo-b-on-the-mobility-of-germanium-and-rare-earth-elements-in-soil-and-uptake-in-phalaris-arundinacea
#4
Oliver Wiche, Dirk Tischler, Carla Fauser, Jana Lodemann, Hermann Heilmeier
Effects of citric acid and desferrioxamine B (DFO-B) on the availability of Ge and selected REEs (La, Nd, Gd, Er) to P. arundinacea were investigated. A soil dissolution experiment was conducted to elucidate the effect of citric acid and DFO-B at different concentrations (1 and 10 mmol l(-1) citric acid) on the release of Ge and REEs from soil. In a greenhouse plants of P. arundinacea were cultivated on soil and on sand cultures to investigate the effects of citric acid and DFO-B on the uptake of Ge and REEs by the plants...
February 3, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28144868/phytoremediation-of-urban-soils-contaminated-with-trace-metals-using-noccaea-caerulescens-comparing-non-metallicolous-populations-to-the-metallicolous-ganges-in-field-trials
#5
Arnaud Jacobs, Thomas Drouet, Thibault Sterckeman, Nausicaa Noret
Urban soil contamination with trace metals is a major obstacle to the development of urban agriculture as crops grown in urban gardens are prone to accumulate trace metals up to toxic levels for human consumption. Phytoextraction is considered as a potentially cost-effective alternative to conventional methods such as excavation. Field trials of phytoextraction with Noccaea caerulescens were conducted on urban soils contaminated with Cd, Cu, Pb, and Zn (respectively around 2, 150-200, 400-500, and 400-700 μg g(-1) of dry soil)...
January 31, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28135667/phytoextraction-of-toxic-trace-elements-by-sorghum-bicolor-inoculated-with-streptomyces-pactum-act12-in-contaminated-soils
#6
Amjad Ali, Di Guo, Amanullah Mahar, Ping Wang, Fang Ma, Feng Shen, Ronghua Li, Zengqiang Zhang
The increasing industrial, mining and agricultural activities have intensified the release of potential toxic trace elements (PTEs), which are of great concern to human health and environment. The alarming increase in PTEs concentration, stress the need for biotechnological remediation approaches. In order to assist phytoextraction of PTEs, different combinations of Streptomyces pactum (Act12) with biochar were applied to mining and industrial polluted soils of Shaanxi and Hunan Provinces of China, respectively...
January 27, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28120224/evaluating-phytoextraction-efficiency-of-two-high-biomass-crops-after-soil-amendment-and-inoculation-with-rhizobacterial-strains
#7
Álvarez-López Vanessa, Prieto-Fernández Ángeles, Roiloa Sergio, Rodríguez-Garrido Beatriz, Herzig Rolf, Puschenreiter Markus, Kidd Petra Susan
We evaluated the effect of compost amendment and/or bacterial inoculants on the growth and metal accumulation of Salix caprea (clone BOKU 01 AT-004) and Nicotiana tabacum (in vitro-bred clone NBCu10-8). Soil was collected from an abandoned Pb/Zn mine and rhizobacterial inoculants were previously isolated from plants growing at the same site. Plants were grown in untreated or compost-amended (5% w/w) soil and were inoculated with five rhizobacterial strains. Non-inoculated plants were also established as a control...
January 24, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28104557/a-comparative-study-on-capability-of-different-tree-species-in-accumulating-heavy-metals-from-soil-and-ambient-air
#8
Ahmad Alahabadi, Mohammad Hassan Ehrampoush, Mohammad Miri, Hamideh Ebrahimi Aval, Samira Yousefzadeh, Hamid Reza Ghaffari, Ehsan Ahmadi, Parvaneh Talebi, Zeynab Abaszadeh Fathabadi, Fatemeh Babai, Ali Nikoonahad, Kiomars Sharafi, Ahmad Hosseini-Bandegharaei
Heavy metals (HMs) in the urban environment can be bio-accumulated by plant tissues. The aim of this study was to compare fourteen different tree species in terms of their capability to accumulate four airborne and soilborne HMs including; zinc (Zn), copper (Cu), lead (Pb), and cadmium (Cd). Samplings were performed during spring, summer, and fall seasons. To compare bioaccumulation ability, bio-concentration factor (BCF), comprehensive bio-concentration index (CBCI), and metal accumulation index (MAI) were applied...
April 2017: Chemosphere
https://www.readbyqxmd.com/read/28073642/long-term-impact-of-primary-domestic-sewage-on-metal-loid-accumulation-in-drainage-ditch-sediments-plants-and-water-implications-for-phytoremediation-and-restoration
#9
Mathieu Nsenga Kumwimba, Bo Zhu, Fidèle Suanon, Diana Kavidia Muyembe, Mawuli Dzakpasu
We evaluate the long-term performance of a vegetated drainage ditch (VDD) treating domestic sewage with respect to heavy metal/metalloid (HM/M) accumulation in sediments, plants and water. VDD sediment contained significantly higher macro and trace elements compared to an agricultural ditch (AD) sediment. However, concentrations of HM/Ms in VDD sediment were below the ranges considered toxic to plants. Most HM/Ms were efficiently removed in the VDD, whereby removal efficiencies varied between 11% for Al and 89% for K...
January 7, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28044274/bioremediation-of-copper-contaminated-soils-by-bacteria
#10
REVIEW
Jean-Yves Cornu, David Huguenot, Karine Jézéquel, Marc Lollier, Thierry Lebeau
Although copper (Cu) is an essential micronutrient for all living organisms, it can be toxic at low concentrations. Its beneficial effects are therefore only observed for a narrow range of concentrations. Anthropogenic activities such as fungicide spraying and mining have resulted in the Cu contamination of environmental compartments (soil, water and sediment) at levels sometimes exceeding the toxicity threshold. This review focuses on the bioremediation of copper-contaminated soils. The mechanisms by which microorganisms, and in particular bacteria, can mobilize or immobilize Cu in soils are described and the corresponding bioremediation strategies-of varying levels of maturity-are addressed: (i) bioleaching as a process for the ex situ recovery of Cu from Cu-bearing solids, (ii) bioimmobilization to limit the in situ leaching of Cu into groundwater and (iii) bioaugmentation-assisted phytoextraction as an innovative process for in situ enhancement of Cu removal from soil...
February 2017: World Journal of Microbiology & Biotechnology
https://www.readbyqxmd.com/read/28043023/feasibility-of-pb-phytoextraction-using-nano-materials-assisted-ryegrass-results-of-a-one-year-field-scale-experiment
#11
Shu-Xuan Liang, Yu Jin, Wei Liu, Xiliang Li, Shi-Gang Shen, Ling Ding
The effect of the combined application of nano-hydroxyapatite (NHAP) or nano-carbon black (NCB) on the phytoextraction of Pb by ryegrass was investigated as an enhanced remediation technique for soils by field-scale experiment. After the addition of 0.2% NHAP or NCB to the soil, temporal variation of the uptake of Pb in aboveground parts and roots were observed. Ryegrass shoot concentrations of Pb were lower with nano-materials application than without nano-materials for the first month. However, the shoot concentrations of Pb were significantly increased with nano-materials application, in particular NHAP groups...
April 1, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28040210/ecosystem-services-and-plant-physiological-status-during-endophyte-assisted-phytoremediation-of-metal-contaminated-soil
#12
Aritz Burges, Lur Epelde, Fernando Blanco, José M Becerril, Carlos Garbisu
Mining sites shelter a characteristic biodiversity with large potential for the phytoremediation of metal contaminated soils. Endophytic plant growth-promoting bacteria were isolated from two metal-(hyper)accumulator plant species growing in a metal contaminated mine soil. After characterizing their plant growth-promoting traits, consortia of putative endophytes were used to carry out an endophyte-assisted phytoextraction experiment using Noccaea caerulescens and Rumex acetosa (singly and in combination) under controlled conditions...
December 28, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/28029384/fungal-endophytes-and-their-interactions-with-plants-in-phytoremediation-a-review
#13
REVIEW
Zujun Deng, Lixiang Cao
Endophytic microorganisms (including bacteria and fungi) are likely to interact closely with their hosts and are more protected from adverse changes in the environment. The microbiota contribute to plant growth, productivity, carbon sequestration, and phytoremediation. Elevated levels of contaminants (i.e. metals) are toxic to most plants, the plant's metabolism and growth were impaired and their potential for metal phytoextraction is highly restricted. Exploiting endophytic microorganisms to reduce metal toxicity to plants have been investigated to improve phytoremediation efficiencies...
October 28, 2016: Chemosphere
https://www.readbyqxmd.com/read/28024749/influence-of-the-vegetative-cover-on-the-fate-of-trace-metals-in-retention-systems-simulating-roadside-infiltration-swales
#14
M C Leroy, S Marcotte, M Legras, V Moncond'huy, F Le Derf, F Portet-Koltalo
Large-scale outdoor mesocosms were designed and co-contaminated with metals (Cd, Pb, Zn) and organic compounds to better understand the complex functioning of urban roadside swale environments. Infiltration systems were planted with macrophytes (P. arundinaceae, J. effusus and I. pseudacorus) or grassed, and natural or spiked target metals were monitored over two years. In the non-spiked mesocosms, atmospheric metal inputs were slightly higher than outputs, leading to low metal accumulation in topsoils and to very low outflow water contamination (<0...
December 23, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/28000074/enhancement-of-cd-phytoextraction-by-hyperaccumulator-sedum-alfredii-using-electrical-field-and-organic-amendments
#15
Wendan Xiao, Dan Li, Xuezhu Ye, Haizhou Xu, Guihua Yao, Jingwen Wang, Qi Zhang, Jing Hu, Na Gao
The combined use of organic amendment-assisted phytoextraction and electrokinetic remediation to decontaminate Cd-polluted soil was demonstrated in a laboratory-scale experiment. The plant species selected was the hyperaccumulator Sedum alfredii. Prior to the pot experiment, the loamy soil was treated with 15 g kg(-1) of pig manure compost, 10 g kg(-1) of humic acid, or 5 mmol kg(-1) of EDTA, and untreated soil without application of any amendment was the control. Two conditions were applied to each treatment: no voltage (without an electrical field) and a direct current (DC) electrical field (1 V cm(-1) with switching polarity every day)...
December 20, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27999882/effects-of-organic-acids-and-sylvite-on-phytoextraction-of-241-am-contaminated-soil
#16
Ping Wang, Liang Du, Zhaoyi Tan, Rongbo Su, Taowen Li
Contamination of soil with Americium ((241)Am) at nuclear sites in China poses a serious problem. We screened six plants, from five families, for their (241)Am-enrichment potential. Europium (Eu), which is morphologically and chemically similar to the highly toxic (241)Am, was used in its place. Moreover, the effects of sylvite, citric acid (CA), malic acid (MA), and humic acid (HA) on the absorption of (241)Am by the plants, and its transport within them, were evaluated along with their effect on plant biomass and (241)Am extraction volume...
December 20, 2016: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/27996300/phytoextraction-of-soil-trace-elements-by-willow-during-a-phytoremediation-trial-in-southern-qu%C3%A3-bec-canada
#17
François Courchesne, Marie-Claude Turmel, Benoît Cloutier-Hurteau, Simon Constantineau, Lara Munro, Michel Labrecque
The phytoextraction of the trace elements (TE) As, Cd, Cu, Ni, Pb and Zn by willow cultivars (Fish Creek, SV1 and SX67) was measured during a three-year field trial in a mildly contaminated soil. Biomass ranged from 2.8 to 4.4 Mg/ha/yr at 30 000 plants/ha. Shoots (62%) were the main component followed by leaves (23%) and roots (15%). Biomass was positively linked to soluble soil dissolved organic carbon (DOC), K and Mg while TE, notably Cd and Zn, had a negative effect. The TE concentration ranking was: Zn > Cu > Cd > Ni, Pb > As and distribution patterns were: i) minima in shoots (As, Ni), ii) maxima in leaves (Cd, Zn) or iii) maxima in roots (Cu, Pb)...
December 20, 2016: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/27995509/the-evaluation-of-growth-and-phytoextraction-potential-of-miscanthus-x-giganteus-and-sida-hermaphrodita-on-soil-contaminated-simultaneously-with-cd-cu-ni-pb-and-zn
#18
Anna Kocoń, Beata Jurga
One of the cheapest, environmentally friendly methods for cleaning an environment polluted by heavy metals is phytoextraction. It builds on the uptake of pollutants from the soil by the plants, which are able to grow under conditions of high concentrations of toxic metals. The aim of this work was to assess the possibility of growing and phytoextraction potential of Miscanthus x giganteus and Sida hermaphrodita cultivated on two different soils contaminated with five heavy metals simultaneously: Cd, Cu, Ni, Pb, and Zn...
December 19, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27936895/portulaca-grandiflora-as-green-roof-vegetation-plant-growth-and-phytoremediation-experiments
#19
K Vijayaraghavan, Jesu Arockiaraj, Seralathan Kamala-Kannan
Finding appropriate rooftop vegetation may improve the quality of runoff from green roofs. Portulaca grandiflora was examined as possible vegetation for green roofs. Green roof substrate was found to have low bulk density (360.7 kg/m(3)), high water holding capacity (49.4%), air-filled porosity (21.1%) and hydraulic conductivity (5270 mm/h). The optimal substrate also supported the growth of P. grandiflora with biomass multiplication of 450.3% and relative growth rate of 0.038. Phytoextraction potential of P...
December 12, 2016: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/27936869/cadmiun-phytoextraction-from-loam-soil-in-tropical-southern-china-by-sorghum-bicolor
#20
Xu Wang, Can Chen, Jianlong Wang
The cadmium (Cd) uptake characteristics by Sorghum bicolor cv. Nengsi 2# and Cowley from the acidic sandy loam soil (pH = 6.1) during the entire growth period (100 d) were investigated in pot outdoors in tropical district of southern China, Hainan Island. The Cd-spiked levels in soil were set as 3 mg/kg and 15 mg/kg. Correspondingly the available Cd levels in soil extracted by Mechlich III solution were 2.71 and 9.41 mg/kg, respectively. Two varieties in full growth period (100 d) basically did not show the significant difference in their growth and Cd uptake...
December 12, 2016: International Journal of Phytoremediation
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