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It is well known that heavy metals cannot be chemically degraded and need to be physically removed or be transformed into nontoxic compounds [ 1 ]. Arsenic atomic number 33 is a silver-grey brittle crystalline solid with atomic weight of Arsenic is odorless and tasteless. Arsenic can combine with other elements to form inorganic and organic arsenicals [ 10 ]. In the environment, arsenic is combined with oxygen, chlorine, and sulfur to form inorganic arsenic compounds.

Inorganic arsenic compounds are mainly used to preserve wood. Organic arsenic compounds are used as pesticides, primarily on cotton plants [ 11 ]. Environmental forms include arsenious acids H 3 AsO 3 , H 3 AsO 3 , , arsenic acids H 3 AsO 4 , , , arsenites, arsenates, methylarsenic acid, dimethylarsinic acid, and arsine.

From both the biological and the toxicological points of view, arsenic compounds can be classified into three major groups. These groups are inorganic arsenic compounds, organic arsenic compounds, and arsine gas [ 13 ]. It is a hard acid and preferentially complexes with oxides and nitrogen. Trivalent arsenites predominate in moderately reducing anaerobic environments such as groundwater [ 9 ]. The most common trivalent inorganic arsenic compounds are arsenic trioxide, sodium arsenite, and arsenic trichloride [ 13 ]. Arsenic is one of the contaminants found in the environment which is notoriously toxic to man and other living organisms [ 14 ].

It is a highly toxic element that exists in various species, and the toxicity of arsenic depends on its species. The pH, redox conditions, surrounding mineral composition, and microbial activities affect the form inorganic or organic and the oxidation state of arsenic. In general, inorganic compounds of arsenic are regarded as more highly toxic than most organic forms which are less toxic [ 10 , 14 , 16 , 17 ]. The trivalent compounds arsenites are more toxic than the pentavalent compounds arsenates [ 16 , 17 ]. However, the trivalent methylated arsenic species have been found to be more toxic than inorganic arsenic because they are more efficient at causing DNA breakdown [ 17 ].

Lead Pb , with atomic number 82, atomic weight It has four naturally occurring isotopes with atomic weights , , and in decreasing order of abundance. Lead Pb exists in many forms in the natural sources throughout the world and is now one of the most widely and evenly distributed trace metals. Soil and plants can be contaminated by lead from car exhaust, dust, and gases from various industrial sources.

Metal pollution has a harmful effect on biological systems and does not undergo biodegradation [ 7 ]. Soil can be contaminated with Pb from several other sources such as industrial sites, from leaded fuels, old lead plumbing pipes, or even old orchard sites in production where lead arsenate is used. Lead accumulates in the upper 8 inches of the soil and is highly immobile. Contamination is long-term. Without remedial action, high soil lead levels will never return to normal [ 20 ].

In the environment, lead is known to be toxic to plants, animals, and microorganisms. Effects are generally limited to especially contaminated areas [ 21 ]. Pb contamination in the environment exists as an insoluble form, and the toxic metals pose serious human health problem, namely, brain damage and retardation [ 5 ]. Mercury is a naturally occurring metal that is present in several forms. Metallic mercury is shiny, silver-white, odorless liquid. Mercury combines with other elements, such as chlorine, sulfur, or oxygen, to form inorganic mercury compounds or salts, which are usually white powders or crystals.

Mercury also combines with carbon to make organic mercury compounds [ 22 ]. As any other metal, mercury could occur in the soil in various forms. It dissolves as free ion or soluble complex and is nonspecifically adsorbed by binding mainly due to the electrostatic forces, chelated, and precipitated as sulphide, carbonate, hydroxide, and phosphate. There are three soluble forms of Hg in the soil environment. A second potential route for the conversion of mercury in the soil is methylation to methyl or dimethyl mercury by anaerobic bacteria [ 24 ]. Mercury is a persistent environmental pollutant with bioaccumulation ability in fish, animals, and human beings [ 23 ].

Mercury salts and organomercury compounds are among the most poisonous substances in our environment. The mechanism and extent of toxicity depend strongly on the type of compound and the redox state of mercury [ 25 ].

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Environmental contamination due to mercury is caused by several industries, petrochemicals, minings, painting, and also by agricultural sources such as fertilizer and fungicidal sprays [ 26 ]. Some of the more common sources of mercury found throughout the environment include but may not be limited to the household bleach, acid, and caustic chemicals e. Though mercury use in many of the above items being produced now is restricted or banned, there are still some existing, older products in use [ 22 ].

Terrestrial plants are generally insensitive to the harmful effects of mercury compounds; however, mercury is known to affect photosynthesis and oxidative metabolism by interfering with electron transport in chloroplasts and mitochondria. Mercury also inhibits the activity of aquaporins and reduces plant water uptake [ 27 ]. Mercury and its compounds are cumulative toxins and in small quantities are hazardous to human health. The major effects of mercury poisoning manifest as neurological and renal disturbances as it can easily pass the blood-brain barrier and has effect on the brain [ 26 ].

Phytoremediation techniques have been briefly depicted in many literatures or articles. Some definitions on phytoremediation that have been described by several researchers are listed in Table 1. Generally, according to the above researchers, phytoremediation is defined as an emerging technology using selected plants to clean up the contaminated environment from hazardous contaminant to improve the environment quality. Figure 1 depicts the uptake mechanisms of both organics and inorganics contaminants through phytoremediation technology.

For organics, it involves phytostabilization, rhizodegradation, rhizofiltration, phytodegradation, and phytovolatilization. These mechanisms related to organic contaminant property are not able to be absorbed into the plant tissue. For inorganics, mechanisms which can be involved are phytostabilization, rhizofiltration, phytoaccumulation and phytovolatilization. The root plants exudates to stabilize, demobilize and bind the contaminants in the soil matrix, thereby reducing their bioavailability.

These all are called as phytostabilization process. Certain plant species have used to immobilize contaminants in the soil and ground water through absorption and accumulation by roots, adsorption onto roots, or precipitation within the root zone. This process is for organics and metals contaminants in soils, sediments, and sludges medium [ 29 , 31 ].

This is for metals, metalloids, radionuclides, nonmetals, and organics contaminants in soils, sediments, and sludges medium [ 29 , 31 ]. Phytovolatilization process is the plants ability to absorb and subsequently volatilize the contaminant into the atmosphere. This process is for metal contaminants in groundwater, soils, sediments, and sludges medium. This process is for complex organic molecules that are degraded into simpler molecule contaminants in soils, sediments, sludges, and groundwater medium [ 29 , 31 ].

This process is for metals, excess nutrients, and radionuclide contaminants in groundwater, surface water, and wastewater medium [ 29 , 31 ].


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The breakdown of contaminants in the soil through microbial activity that is enhanced by the presence of the root zone is called rhizodegradation. This process uses microorganisms to consume and digest organic substances for nutrition and energy. Natural substances released by the plant roots, sugars, alcohols, and acids, contain organic carbon that provides food for soil microorganisms and establish a dense root mass that takes up large quantities of water.

This process is for organic substance contaminants in soil medium [ 29 , 31 ]. Contaminant uptake by plants and its mechanisms have been being explored by several researchers. It could be used to optimize the factors to improve the performance of plant uptake. According to Sinha et al. Accumulators survive despite concentrating contaminants in their aerial tissues. They biodegrade or biotransform the contaminants into inert forms in their tissues. The excluders restrict contaminant uptake into their biomass. Plants have evolved highly specific and very efficient mechanisms to obtain essential micronutrients from the environment, even when present at low ppm levels.

Plant roots, aided by plant-produced chelating agents and plant-induced pH changes and redox reactions, are able to solubilize and take up micronutrients from very low levels in the soil, even from nearly insoluble precipitates. Plants have also evolved highly specific mechanisms to translocate and store micronutrients.

These same mechanisms are also involved in the uptake, translocation, and storage of toxic elements, whose chemical properties simulate those of essential elements. Thus, micronutrient uptake mechanisms are of great interest to phytoremediation [ 37 ]. Each transport mechanism is likely to take up a range of ions. A basic problem is the interaction of ionic species during uptake of various heavy metal contaminants. After uptake by roots, translocation into shoots is desirable because the harvest of root biomass is generally not feasible.

Little is known regarding the forms in which metal ions are transported from the roots to the shoots [ 37 ]. Plant uptake-translocation mechanisms are likely to be closely regulated. Plants generally do not accumulate trace elements beyond near-term metabolic needs. Another issue is the form in which toxic metal ions are stored in plants, particularly in hyperaccumulating plants, and how these plants avoid metal toxicity.

Multiple mechanisms are involved. Storage in the vacuole appears to be a major one [ 37 ]. Water, evaporating from plant leaves, serves as a pump to absorb nutrients and other soil substances into plant roots. This process, termed evapotranspiration, is responsible for moving contamination into the plant shoots as well. Since contamination is translocated from roots to the shoots, which are harvested, contamination is removed while leaving the original soil undisturbed.

Nonaccumulating plants typically have a shoot-to-root ratio considerably less than one. Ideally, hyperaccumulators should thrive in toxic environments, require little maintenance and produce high biomass, although few plants perfectly fulfill these requirements [ 38 ]. Metal accumulating plant species can concentrate heavy metals like Cd, Zn, Co, Mn, Ni, and Pb up to or times those taken up by nonaccumulator excluder plants. In most cases, microorganisms bacteria and fungi, living in the rhizosphere closely associated with plants, may contribute to mobilize metal ions, increasing the bioavailable fraction.

Their role in eliminating organic contaminants is even more significant than that in case of inorganic compounds [ 39 , 40 ]. Heavy metal uptake by plant through phytoremediation technologies is using these mechanisms of phytoextraction, phytostabilisation, rhizofiltration, and phytovolatilization as shown in Figure 2. Phytostabilisation is the use of certain plant species to immobilize the contaminants in the soil and groundwater through absorption and accumulation in plant tissues, adsorption onto roots, or precipitation within the root zone preventing their migration in soil, as well as their movement by erosion and deflation [ 28 , 39 — 42 ].

Rhizofiltration is the adsorption or precipitation onto plant roots or absorption into and sequesterization in the roots of contaminants that are in solution surrounding the root zone by constructed wetland for cleaning up communal wastewater [ 28 , 39 — 42 ]. Phytovolatilization is the uptake and transpiration of a contaminant by a plant, with release of the contaminant or a modified form of the contaminant to the atmosphere from the plant. Phytovolatilization occurs as growing trees and other plants take up water along with the contaminants.

Some of these contaminants can pass through the plants to the leaves and volatilize into the atmosphere at comparatively low concentrations [ 28 , 39 — 42 ]. Plants also perform an important secondary role in physically stabilizing the soil with their root system, preventing erosion, protecting the soil surface, and reducing the impact of rain. At the same time, plant roots release nutrients that sustain a rich microbial community in the rhizosphere.

Bacterial community composition in the rhizosphere is affected by complex interactions between soil type, plant species, and root zone location. Microbial populations are generally higher in the rhizosphere than in the root-free soil. This is due to a symbiotic relationship between soil microorganisms and plants. This symbiotic relationship can enhance some bioremediation processes. Plant roots also may provide surfaces for sorption or precipitation of metal contaminants [ 27 ]. In phytoremediation, the root zone is of special interest. The contaminants can be absorbed by the root to be subsequently stored or metabolised by the plant.

Degradation of contaminants in the soil by plant enzymes exuded from the roots is another phytoremediation mechanism [ 43 ]. For many contaminants, passive uptake via micropores in the root cell walls may be a major route into the root, where degradation can take place [ 3 ]. There are several factors which can affect the uptake mechanism of heavy metals, as shown in Figure 3. By having knowledge about these factors, the uptake performance by plant can be greatly improved. Plants species or varieties are screened, and those with superior remediation properties are selected [ 31 ].

The uptake of a compound is affected by plant species characteristic [ 44 ]. The success of the phytoextraction technique depends upon the identification of suitable plant species that hyperaccumulate heavy metals and produce large amounts of biomass using established crop production and management practices [ 24 ]. Agronomical practices are developed to enhance remediation pH adjustment, addition of chelators, fertilizers [ 31 ].

For example, the amount of lead absorbed by plants is affected by the pH, organic matter, and the phosphorus content of the soil. To reduce lead uptake by plants, the pH of the soil is adjusted with lime to a level of 6. The Root Zone is of special interest in phytoremediation. It can absorb contaminants and store or metabolize it inside the plant tissue. Degradation of contaminants in the soil by plant enzymes exuded from the roots is another phytoremediation mechanism.

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A morphological adaptation to drought stress is an increase in root diameter and reduced root elongation as a response to less permeability of the dried soil [ 43 ]. Vegetative Uptake is affected by the environmental conditions [ 44 ]. The temperature affects growth substances and consequently root length. Root structure under field conditions differs from that under greenhouse condition [ 43 ]. The success of phytoremediation, more specifically phytoextraction, depends on a contaminant-specific hyperaccumulator [ 45 ].

Understanding mass balance analyses and the metabolic fate of pollutants in plants are the keys to proving the applicability of phytoremediation [ 46 ]. Metal uptake by plants depends on the bioavailability of the metal in the water phase, which in turn depends on the retention time of the metal, as well as the interaction with other elements and substances in the water. Furthermore, when metals have been bound to the soil, the pH, redox potential, and organic matter content will all affect the tendency of the metal to exist in ionic and plant-available form.

Plants will affect the soil through their ability to lower the pH and oxygenate the sediment, which affects the availability of the metals [ 47 ], increasing the bioavailability of heavy metals by the addition of biodegradable physicochemical factors, such as chelating agents and micronutrients [ 34 ]. The increase of the uptake of heavy metals by the energy crops can be influenced by increasing the bioavailability of heavy metals through addition of biodegradable physicochemical factors such as chelating agents, and micronutrients, and also by stimulating the heavy-metal-uptake capacity of the microbial community in and around the plant.

This faster uptake of heavy metals will result in shorter and, therefore, less expensive remediation periods. However, with the use of synthetic chelating agents, the risk of increased leaching must be taken into account [ 34 ]. The use of chelating agents in heavy-metal-contaminated soils could promote leaching of the contaminants into the soil.

Since the bioavailability of heavy metals in soils decreases above pH 5. It was found that exposing plants to EDTA for a longer period 2 weeks could improve metal translocation in plant tissue as well as the overall phytoextraction performance. Plant roots exude organic acids such as citrate and oxalate, which affect the bioavailability of metals. In chelate-assisted phytoremediation, synthetic chelating agents such as NTA and EDTA are added to enhance the phytoextraction of soil-polluting heavy metals.

The presence of a ligand affects the biouptake of heavy metals through the formation of metal-ligand complexes and changes the potential to leach metals below the root zone [ 48 ]. Several studies have described the performance of heavy metals uptake by plants. It is reported that phytoremediation technology is an alternative to treat heavy-metal-contaminated side which will be more admitted in order to remediate the environment. Table 2 lists some research done to remediate heavy metals from contaminated soil, while Table 3 lists some research conducted to remediate them from contaminated water and wastewater.

Based on the collected data from the phytoremediation research listed in Tables 2 and 3 , the accumulation of heavy metals As, Pb, and Hg in plant tissue is summarized in respective, Figures 4 , 5 , and 6. According to Figure 4 , the highest accumulation of As in plant tissue the researchers have not detailed which part it is, but it might be the whole plant occurs in Pteris vittata L.

It can reach more than 0. In plant root, the highest accumulation of As is in Populus nigra , which can reach more than 0. Among those species are species of Brassica campestris L , Brassica carinata A.


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Figure 6 shows that accumulated Hg in Brassica juncea L. Phytoremediation techniques may also be more publicly acceptable, aesthetically pleasing, and less disruptive than the current techniques of physical and chemical process [ 38 ]. Advantages of this technology are its effectiveness in contaminant reduction, low-cost, being applicable for wide range of contaminants, and in overall it is an environmental friendly method.

Figure 7 simplifies some advantages of phytoremediation technology. The major advantages of the heavy metal adsorption technology by biomass are its effectiveness in reducing the concentration of heavy metal ions to very low levels and the use of inexpensive biosorbent materials [ 2 ]. Phytoremediation as possibly the cleanest and cheapest technology can be employed in the remediation of selected hazardous sites [ 29 ]. Phytoremediation encompasses a number of different methods that can lead to contaminant degradation [ 24 ]. Phytoremediation is a low-cost option and inexpensive approach for remediating environmental media, particularly suited to large sites that have relatively low levels of contamination [ 34 ].

This technology has been receiving attention lately as an innovative, cost-effective alternative to the more established treatment methods used at hazardous waste sites [ 29 ]. Phytoremediation potentially offers unique, low cost solutions to many currently problems of soil contamination [ 32 , 75 ]. It is cost-effective for large volumes of water having low concentrations of contaminants and for large areas having low to moderately contaminated surface soils [ 46 ]. It is applicable to a wide range of toxic metals and radionuclides [ 32 ] and also useful for treating a broad range of environmental contaminants, including organic and inorganic contaminants [ 46 ].

Phytoremediation is regarded as a new approach for the cleanup of contaminated soils, water, and ambient air [ 34 ]. Phytoremediation research can also contribute to the improvement of poor soils such as those with high aluminum or salt levels [ 75 ]. It is applicable to a range of toxic metals and radionuclides, minimal environmental disturbance, elimination of secondary air or water-borne wastes, and public acceptance [ 32 ]. Phytoextraction is considered as an environmentaly friendly method to remove metals from contaminated soils in situ. This method can be used in much larger-scale clean-up operations and has been applied for other heavy metals [ 76 ].

It is an esthetically pleasing, solar-energy-driven cleanup technology and there is minimal environmental disruption and in situ treatment preserves topsoil. In Situ applications decrease the amount of soil disturbance compared to conventional methods. It can be performed with minimal environmental disturbance with topsoil left in a usable condition and may be reclaimed for agricultural use. The organic pollutants may be degraded to CO 2 and H 2 O, removing environmental toxicity [ 46 ].

Phytoremediation can be an alternative to the much harsher remediation technologies of incineration, thermal vaporization, solvent washing, or other soil washing techniques, which essentially destroy the biological component of the soil and can drastically alter its chemical and physical characteristics as well as creating a relatively nonviable solid waste. Phytoremediation actually benefits the soil, leaving an improved, functional soil ecosystem at costs estimated at approximately one-tenth of those currently adopted technologies [ 3 ].

It is the most ecological cleanup technology for contaminated soils and is also known as a green technology. Another advantage of phytoremediation is the generation of a recyclable metal-rich plant residue [ 32 ]. Phytoremediation could be a viable option to decontaminate heavy-metal-polluted soils, particularly when the biomass produced during the phytoremediation process could be economically valorized in the form of bioenergy. The use of metal-accumulating bioenergy crops might be suitable for this purpose. If soils, contaminated with heavy metals, are phytoremediated with oil crops, biodiesel production from the resulting plant oil could be a viable option to generate bioenergy [ 34 ].

In large-scale applications, the potential energy stored can be utilized to generate thermal energy [ 46 ]. The success of the phytoextraction technique depends upon the identification of suitable plant species that can hyperaccumulate heavy metals and produce large amounts of biomass using established crop production and management practices [ 24 ].

On the other hand, there are certain limitations to phytoremediation system Figure 8. Among them are being time-consuming method, the amount of produced biomass, the root depth, soil chemistry and the level of contamination, the age of plant, the contaminant concentration, the impacts of contaminated vegetation, and climatic condition.

Phytoremediation can be a time-consuming process, and it may take at least several growing seasons to clean up a site. The intermediates formed from those organic and inorganic contaminants may be cytotoxic to plants [ 46 ]. Phytoremediation is also limited by the growth rate of the plants. More time may be required to phytoremediate a site as compared with other more traditional cleanup technologies. Excavation and disposal or incineration takes weeks to months to accomplish, while phytoextraction or degradation may need several years.

Therefore, for sites that pose acute risks for human and other ecological receptors, phytoremediation may not be the remediation technique of choice [ 29 , 46 ]. Phytoremediation might be best suited for remote areas where human contact is limited or where soil contamination does not require an immediate response [ 38 ]. One of the unresolved issues is the tradeoff between toxic element accumulation and productivity.

This is often an acceptable rate of contaminant removal, allowing site remediation over a few years to a couple of decades, particularly where the concentration of the contaminant can be lowered sufficiently to meet regulatory criteria. The success of phytoremediation may be limited by factors such as growing time, climate, root depth, soil chemistry, and level of contamination [ 38 ]. Root contact is a primary limitation on phytoremediation applicability. Remediation with plants requires that contaminants be in contact with the root zone of the plants. Either the plants must be able to extend roots to the contaminants, or the contaminated media must be moved to be within range of the plants [ 29 ].

Restricted to sites with shallow contamination within rooting zone of remediative plants, ground surface at the site may have to be modified to prevent flooding or erosion [ 46 ]. Age greatly affects the physiological activity of a plant, especially its roots.

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Generally, roots of a young plant display greater ability to absorb ions than do those of an old plant when they are similar in size. It is important to use healthy young plants for more efficient plant removal. However, this does not rule out the use of larger older plants whose larger size may compensate for their lower physiological activity as compared to smaller younger plants [ 45 ].

High concentrations of contaminants may inhibit plant growth and, thus, may limit application on some sites or some parts of sites. This phytotoxicity could lead to a remedial approach in which high-concentration waste is handled with expensive ex situ techniques that quickly reduce acute risk, while in situ phytoremediation is used over a longer period of time to clean the high volumes of lower contaminant concentrations [ 29 ].

A major limitation in the phytoremediation of toxic elements is the maximal level that can be accumulated by plants. Restricted to sites with low contaminant concentrations, the treatment is generally limited to soils at one meter from the surface and groundwater within a few meters of the surface with soil amendments may be required [ 46 ]. Some ecological exposure may occur whenever plants are used to interact with contaminants from the soil.

The fate of the metals in the biomass is a concern.

Although some forms of phytoremediation involve accumulation of metals and require handling of plant material embedded with metals, most plants do not accumulate significant levels of organic contaminants. While metal-accumulating plants will need to be harvested and either recycled or disposed of in compliance with applicable regulations, most phytoremediative plants do not require further treatment or disposal [ 29 ].

Harvested plant biomass from phytoextraction may be classified as a hazardous waste, hence, disposal should be proper. Climatic or hydrologic conditions may restrict the rate of growth of plants that can be utilized. Introduction of nonnative species may affect biodiversity [ 46 ]. Heavy metals uptake, by plants using phytoremediation technology, seems to be a prosperous way to remediate heavy-metals-contaminated environment.

It has some advantages compared with other commonly used conventional technologies. Several factors must be considered in order to accomplish a high performance of remediation result. Pratima Bajpai. Pierre Pontarotti. Advances in Textile Biotechnology. V Nierstrasz. The Physiology of Microalgae. John Beardall. Plant Adaptation Strategies in Changing Environment.

Vertika Shukla. Progress in the Chemistry of Organic Natural Products Douglas Kinghorn. Modern Topics in the Phototrophic Prokaryotes. Patrick C. Metal Metabolism in Aquatic Environments. William J. Plant-Based Remediation Processes. Dharmendra Kumar Gupta. Lignin and Lignans as Renewable Raw Materials.

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Reviews of Environmental Contamination and Toxicology 204 Reviews of Environmental Contamination and Toxicology 204
Reviews of Environmental Contamination and Toxicology 204 Reviews of Environmental Contamination and Toxicology 204
Reviews of Environmental Contamination and Toxicology 204 Reviews of Environmental Contamination and Toxicology 204
Reviews of Environmental Contamination and Toxicology 204 Reviews of Environmental Contamination and Toxicology 204
Reviews of Environmental Contamination and Toxicology 204 Reviews of Environmental Contamination and Toxicology 204
Reviews of Environmental Contamination and Toxicology 204 Reviews of Environmental Contamination and Toxicology 204
Reviews of Environmental Contamination and Toxicology 204 Reviews of Environmental Contamination and Toxicology 204

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