Enhanced Heavy Metal Phytoextraction from Marine Dredged Sediments Comparing Conventional Chelating Agents (Citric Acid and EDTA) with Humic Substances

Bianchi, Veronica; Masciandaro, Grazia; Giraldi, David; Ceccanti, B.; Iannelli, Renato

doi:10.1007/s11270-008-9693-0

Cited by 32 publications

(30 citation statements)

References 31 publications

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“…The effect of compost on Cd bioavailability could be related to chelating/complexing reactions by acid functional groups of humic substances that can reduce the precipitation as hydroxid/carbonate expected in an alkaline and carbonatic soil (Clemente and Bernal, 2006;Bianchi et al, 2008). These results confirm the findings of an experiment carried out in a similar environment (Fagnano et al, 2011).…”

Section: Soil Potentially Toxic Elements Contentsupporting

confidence: 77%

“…On the contrary, many organic compounds such as low molecular organic acids (citric and gallic acids) are able to increase Cd, zinc (Zn), copper (Cu) and Ni uptake from soil without environmental risks (do Nascimiento et al, 2006). In some cases, compost fertilisation could be a useful tool to increase metal availability due to the high capacity of metal complexation by humic substances (Clemente and Bernal, 2006;Bianchi et al, 2008), soil fertility due to the soil organic matter buildup (Piccolo et al, 2004;Fagnano et al, 2011), and functional microbial groups (Pepe et al, 2013). Moreover, the effect of exogenous organic matter is pH dependent, allowing an increase in metal availability in alkaline soils (Santibáñez et al, 2008;Fagnano et al, 2011) while this is reduced in low pH soils (Alvarenga et al, 2009;Fornes et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

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Assisted phytoextraction of heavy metals: compost and Trichoderma effects on giant reed (Arundo donax L.) uptake and soil N-cycle microflora

et al. 2013

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Little information is available as to the real effectiveness of the phytoextraction remediation technique, since laboratory experiments are still the most common way in which this is measured. Given this, an experiment on a cadmium-polluted soil was carried out in open field conditions in Southern Italy with the aim of assessing the growth and the phytoextraction potential of giant reed (Arundo donax L). Compost fertilisation and Trichoderma harzianum A6 inoculations were used to verify the possibility of increasing the metal uptake of the crop. Biomass yield of giant reed in the first growth season (average 12.8 Mg ha -1 ) was not affected by the Cd concentration in the soil and this increased significantly with compost fertilisation (13.8 Mg ha -1 ). Both compost fertilisation and T. harzianum inoculation increased cadmium uptake and translocation in leaves. Nitrifying bacteria was shown to be a useful tool to biomonitor soil quality. These results proved the suitability of the giant reed for assisted-phytoremedation with the use of compost fertilisation and T. harzianum. IntroductionThe extent of soil pollution by potentially toxic elements (PTE) in industrialised areas is well documented (Glass, 1998;Black, 1999) and represents an important environmental concern due to their potential accumulation in the food chain. Human activities such as industrial plants, mining, road transport and the unwise application of sewage sludges, fertilisers and pesticides to agricultural soils are recognised to be the main sources of PTE pollution (do Nascimento et al., 2006;Lado et al., 2008). A large number of methods are available to remediate soils, such as soil washing with synthetic surfactants. However, these are extremely expensive, such that a large number of sites remain contaminated (Ensley, 2000). Moreover, ex situ soil reclamation techniques lead to a big reduction in soil fertility due to the soil disturbance and to the toxicity of synthetic surfactants. Soil washing with humic substances extracted from composted organic matter or from geochemical deposits represents a reliable alternative (Conte et al., 2005) and phytoextraction is a valuable complementary technique. It is low cost and environmentally safe (Wu et al., 2006) and is able to both remove heavy metal pollutants from the soil and to offer important economic and agronomic advantages (Mattina et al., 2003). It involves the utilisation of plants to remove heavy metals from soil and concentrate them in the biomass. For years now, metal hyperaccumulating plants such as Alyssum murale, Berkheya coddii, Brassica juncea and Thlaspi caerulescens have been considered the most suitable tool to decontaminate metal-polluted soils, but the low biomass growth and scarce ability to accumulate various different metals together (Krämer, 2005) have discouraged their inclusion in commercial phytoextraction protocols (do Nascimento et al., 2006). Consequently, the current trend is to use fast-growing high biomass crops that accumulate moderate levels of metals in ...

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Section: Soil Potentially Toxic Elements Contentsupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Assisted phytoextraction of heavy metals: compost and Trichoderma effects on giant reed (Arundo donax L.) uptake and soil N-cycle microflora

et al. 2013

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“…Contradictory results have been obtained from the application of humic acids. Bianchi et al (2008) found increased mobilisation of Cu and Zn, associated with both negligible phytotoxicity in Paspalum vaginatum Sw. and improved metal extraction. Better uptake of Mo in forage in a polluted valley in Austria (meadow rendzina) was observed after application of large quantities (10 g kg -1 w/w, i.e.…”

Section: Humic Acidsmentioning

confidence: 85%

Field crops for phytoremediation of metal-contaminated land. A review

2009

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The use of higher plants to remediate contaminated land is known as phytoremediation, a term coined 15 years ago. Among green technologies addressed to metal pollution, phytoextraction has received increasing attention starting from the discovery of hyperaccumulator plants, which are able to concentrate high levels of specific metals in the above-ground harvestable biomass. The small shoot and root growth of these plants and the absence of their commercially available seeds have stimulated study on biomass species, including herbaceous field crops. We review here the results of a bibliographical survey from 1995 to 2009 in CAB abstracts on phytoremediation and heavy metals for crop species, citations of which have greatly increased, especially after 2001. Apart from the most frequently cited Brassica juncea ( L.) Czern., which is often referred to as an hyperaccumulator of various metals, studies mainly focus on Helianthus annuus L., Zea mays L. and Brassica napus L., the last also having the greatest annual increase in number of citations. Field crops may compensate their low metal concentration by a greater biomass yield, but available data from in situ experiments are currently very few. The use of amendments or chelators is often tested in the field to improve metal recovery, allowing above-normal concentrations to be reached. Values for Zn exceeding 1,000 mg kg(-1) are found in Brassica spp., Phaseolus vulgaris L. and Zea mays, and Cu higher than 500 mg kg(-1) in Zea mays, Phaseolus vulgaris and Sorghum bicolor (L.) Moench. Lead greater than 1,000 mg kg(-1) is measured in Festuca spp. and various Fabaceae. Arsenic has values higher than 200 mg kg(-1) in sorghum and soybean, whereas Cd concentrations are generally lower than 50 mg kg(-1). Assisted phytoextraction is currently facilitated by the availability of low-toxic and highly degradable chelators, such as EDDS and nitrilotriacetate. Currently, several experimental attempts are being made to improve plant growth and metal uptake, and results are being achieved from the application of organic acids, auxins, humic acids and mycorrhization. The phytoremediation efficiency of field crops is rarely high, but their greater growth potential compared with hyperaccumulators should be considered positively, in that they can establish a dense green canopy in polluted soil, improving the landscape and reducing the mobility of pollutants through water, wind erosion and water percolation

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“…There are few limitations to the use of complexing agents. Many synthetic chelators, such as EDTA, Ethylenediamine-N,N 0 -disuccinic acid (EDDS) have low degree of biodegradability (Jiang et al 2003;Wu et al 2005;Bianchi et al 2008;Dermont et al 2008). This problem may be overcome by usage of low phytotoxic and easily biodegradable compounds such as NTA and NLMWOAs (Chen et al 2003;Wenger et al 2003), which are more effective in increasing the metal solubility (Vamerali et al 2010;Rahman and Hasegawa 2011).…”

Section: Chemically Induced Phytoremediationmentioning

confidence: 99%

Phytoremediation of Radionuclides: A Report on the State of the Art

Jagetiya¹,

Sharma²,

Soni³

et al. 2014

Radionuclide Contamination and Remediation Through Plants

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Radionuclides mobilization through extraction from ores and processing for various applications has led to the discharge of these harmful elements into the environment. These contaminants pose a great risk to human health and environment. Remediation of radionuclides and toxic heavy metals deserves the proper attention. Conventional remediation methods used for polluted environments have many limitations including high costs, alteration in soil properties, and disruption in soil native microflora. Alternatively, phytoremediation can serve as a prospective method for decontamination and rehabilitation of polluted sites. The term phytoremediation actually refers to a diverse collection of plant-based technologies, i.e. either naturally occurring or genetically engineered plants are used for cleaning the contaminated environment. Phytoremediation techniques are eco-friendly, cost-effective, easy to implement, and offer an aesthetic value and solar-driven processes with better public acceptance. Practicing various agronomic alterations as well as spatial and successful combination of different plant species assures maximal phytoremediation efficiency. Plants and microorganisms can be genetically modified to remediate the contaminated ecosystems at an accelerated rate. We can harvest better results from phytoremediation technologies by learning more about the different biological processes involved. The future of phytoremediation comprises of ongoing research work and has to go through a developmental phase and several technical barriers. Several attempts still need to be performed with multidisciplinary approach for successful future phytoremedial programmes. This report comprehensively reviews the background, techniques, concept and future course in phytoremediation of heavy metals, particularly radionuclides.

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Enhanced Heavy Metal Phytoextraction from Marine Dredged Sediments Comparing Conventional Chelating Agents (Citric Acid and EDTA) with Humic Substances

Cited by 32 publications

References 31 publications

Assisted phytoextraction of heavy metals: compost and Trichoderma effects on giant reed (Arundo donax L.) uptake and soil N-cycle microflora

Assisted phytoextraction of heavy metals: compost and Trichoderma effects on giant reed (Arundo donax L.) uptake and soil N-cycle microflora

Field crops for phytoremediation of metal-contaminated land. A review

Phytoremediation of Radionuclides: A Report on the State of the Art

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