This list covers hyperaccumulators, plant species which accumulate, or are tolerant of radionuclides (Cd, Cs-137, Co, Pu-238, Ra, Sr, U-234, 235, 238), hydrocarbons and organic solvents (Benzene, BTEX, DDT, Dieldrin, Endosulfan, Fluoranthene, MTBE, PCB, PCNB, TCE and by-products), and inorganic compounds (Potassium ferrocyanide).
See also:
Contaminant | Accumulation rates (in mg/kg of dry weight) | Latin name | English name | H-Hyperaccumulator or A-Accumulator P-Precipitator T-Tolerant | Notes | Sources |
---|---|---|---|---|---|---|
Cd | Athyrium yokoscense | (Japanese false spleenwort?) | Cd(A), Cu(H), Pb(H), Zn(H) | Origin Japan | [1] | |
Cd | >100 | Avena strigosa Schreb. | New-Oat Lopsided Oat or Bristle Oat | [2] | ||
Cd | H- | Bacopa monnieri | Smooth Water Hyssop, Waterhyssop, Brahmi, Thyme-leafed gratiola, Water hyssop | Cr(H), Cu(H), Hg(A), Pb(A) | Origin India; aquatic emergent species | [1] [3] |
Cd | Brassicaceae | Mustards, mustard flowers, crucifers or, cabbage family | Cd(H), Cs(H), Ni(H), Sr(H), Zn(H) | Phytoextraction | [4] | |
Cd | A- | Brassica juncea L. | Indian mustard | Cr(A), Cu(H), Ni(H), Pb(H), Pb(P), U(A), Zn(H) | cultivated | [1] [4] [5] |
Cd | H- | Vallisneria americana | Tape Grass | Cr(A), Cu(H), Pb(H) | Origins Europe and N. Africa; extensively cultivated in the aquarium trade | [1] |
Cd | >100 | Crotalaria juncea | Sunn or sunn hemp | High amounts of total soluble phenolics | [2] | |
Cd | H- | Eichhornia crassipes | Water Hyacinth | Cr(A), Cu(A), Hg(H), Pb(H), Zn(A). Also Cs, Sr, U [6] and pesticides [7] | Pantropical/Subtropical, 'the troublesome weed' | [1] |
Cd | Helianthus annuus | Sunflower | Phytoextraction & rhizofiltration | [1] [4] [8] | ||
Cd | H- | Hydrilla verticillata | Hydrilla | Cr(A), Hg(H), Pb(H) | [1] | |
Cd | H- | Lemna minor | Duckweed | Pb(H), Cu(H), Zn(A) | Native to North America and widespread | [1] |
Cd | T- | Pistia stratiotes | Water lettuce | Cu(T), Hg(H), Cr(H) | Pantropical, Origin South U.S.A.; aquatic herb | [1] |
Cd | Salix viminalis L. | Common Osier, Basket Willow | Ag, Cr, Hg, Se, petroleum hydrocarbons, organic solvents, MTBE, TCE and by-products; [4] Pb, U, Zn (S. viminalix); [8] Potassium ferrocyanide (S. babylonica L.) [9] | Phytoextraction. Perchlorate (wetland halophytes) | [8] | |
Cd | Spirodela polyrhiza | Giant Duckweed | Cr(H), Pb(H), Ni(H), Zn(A) | Native to North America | [1] [10] [11] | |
Cd | >100 | Tagetes erecta L. | African-tall | Tolerance only. Lipid peroxidation level increases; activities of antioxidative enzymes such as superoxide dismutase, ascorbate peroxidase, glutathione reductase, and catalase are depressed. | [2] | |
Cd | Thlaspi caerulescens | Alpine pennycress | Cr(A), Co(H), Cu(H), Mo, Ni(H), Pb(H), Zn(H) | Phytoextraction. Its rhizosphere's bacterial population is less dense than with Trifolium pratense but richer in specific metal-resistant bacteria. [12] | [1] [4] [10] [13] [14] [15] [16] | |
Cd | 1000 | Vallisneria spiralis | Eel grass | 37 records of plants; origin India | [10] [17] | |
Cs-137 | Acer rubrum , Acer pseudoplatanus | Red maple, Sycamore maple | Pu-238, Sr-90 | Leaves: much less uptake in Larch and Sycamore maple than in Spruce. [18] | [6] | |
Cs-137 | Agrostis spp. | Agrostis spp. | Grass or Forb species capable of accumulating radionuclides | [6] | ||
Cs-137 | up to 3000 Bq kg-1 [19] | Amaranthus retroflexus ( cv. Belozernii, aureus, Pt-95) | Redroot Amaranth | Cd(H), Cs(H), Ni(H), Sr(H), Zn(H) [4] | Phytoextraction. Can accumulate radionuclides, ammonium nitrate and ammonium chloride as chelating agents. [6] Maximum concentration is reached after 35 days of growth. [19] | |
Cs-137 | Brassicaceae | Mustards, mustard flowers, crucifers or, cabbage family | Cd(H), Cs(H), Ni(H), Sr(H), Zn(H) | Phytoextraction. Ammonium nitrate and ammonium chloride as chelating agents. [6] | [4] | |
Cs-137 | Brassica juncea | Indian mustard | Contains 2 to 3 times more Cs-137 in his roots than in the biomass above ground [19] Ammonium nitrate and ammonium chloride as chelating agents. | [6] | ||
Cs-137 | Cerastium fontanum | Big Chickweed | Grass or Forb species capable of accumulating radionuclides | [6] | ||
Cs-137 | Beta vulgaris , Chenopodiaceae , Kail? and/or Salsola? | Beet, Quinoa, Russian thistle | Sr-90, Cs-137 | Grass or Forb species capable of accumulating radionuclides | [6] | |
Cs-137 | Cocos nucifera | Coconut palm | Tree able to accumulate radionuclides | [6] | ||
Cs-137 | Eichhornia crassipes | Water hyacinth | U, Sr (high % uptake within a few days [6] ). Also Cd(H), Cr(A), Cu(A), Hg(H), Pb, Zn(A) [1] and pesticides. [7] | [6] | ||
Cs-137 | Eragrostis bahiensis ( Eragrostis ) | Bahia lovegrass | Glomus mosseae as amendment. It increases the surface area of the plant roots, allowing roots to acquire more nutrients, water and therefore more available radionuclides in soil solution. | [6] | ||
Cs-137 | Eucalyptus tereticornis | Forest redgum | Sr-90 | Tree able to accumulate radionuclides | [6] | |
Cs-137 | Festuca arundinacea | Tall fescue | Grass or Forb species capable of accumulating radionuclides | [6] | ||
Cs-137 | Festuca rubra | Fescue | Grass or Forb species capable of accumulating radionuclides | [6] | ||
Cs-137 | Glomus mosseae as chelating agent ( Glomus (fungus) ) | Mycorrhizal fungi | Glomus mosseae as amendment. It increases the surface area of the plant roots, allowing roots to acquire more nutrients, water and therefore more available radionuclides in soil solution. | [6] | ||
Cs-137 | Glomus intradices (Glomus (fungus)) | Mycorrhizal fungi | Glomus mosseae as chelating agent. It increases the surface area of the plant roots, allowing roots to acquire more nutrients, water and therefore more available radionuclides in soil solution. | [6] | ||
Cs-137 | 4900-8600 [20] | Helianthus annuus | Sunflower | U, Sr (high % uptake within a few days [6] ) | Accumulates up to 8 times more Cs-137 than timothy or foxtail. Contains 2 to 3 times more Cs-137 in its roots than in the biomass above ground. [19] | [1] [6] [10] |
Cs-137 | Larix | Larch | Leaves: much less uptake in Larch and Sycamore maple than in Spruce. 20% of the translocated caesium into new leaves resulted from root-uptake 2.5 years after the Chernobyl accident. [18] | |||
Cs-137 | Liquidambar styraciflua | American Sweet Gum | Pu-238, Sr-90 | Tree able to accumulate radionuclides | [6] | |
Cs-137 | Liriodendron tulipifera | Tulip tree | Pu-238, Sr-90 | Tree able to accumulate radionuclides | [6] | |
Cs-137 | Lolium multiflorum | Italian Ryegrass | Sr | Mycorrhizae: accumulates much more Cs-137 and Sr-90 when grown in Sphagnum peat than in any other medium incl. Clay, sand, silt and compost. [21] | [6] | |
Cs-137 | Lolium perenne | Perennial ryegrass | Can accumulate radionuclides | [6] | ||
Cs-137 | Panicum virgatum | Switchgrass | [6] | |||
Cs-137 | Phaseolus acutifolius | Tepary Beans | Cd(H), Cs(H), Ni(H), Sr(H), Zn(H) [4] | Phytoextraction. Ammonium nitrate and ammonium chloride as chelating agents [6] | ||
Cs-137 | Phalaris arundinacea L. | Reed canary grass | Cd(H), Cs(H), Ni(H), Sr(H), Zn(H) [4] Ammonium nitrate and ammonium chloride as chelating agents. [6] | Phytoextraction | ||
Cs-137 | Picea abies | Spruce | Conc. about 25-times higher in bark compared to wood, 1.5–4.7 times higher in directly contaminated twig-axes than in leaves. [18] | |||
Cs-137 | Pinus radiata , Pinus ponderosa | Monterey Pine, Ponderosa pine | Sr-90. Also petroleum hydrocarbons, organic solvents, MTBE, TCE and by-products (Pinus spp. [4] | Phytocontainment. Tree able to accumulate radionuclides. | [6] | |
Cs-137 | Sorghum halepense | Johnson Grass | [6] | |||
Cs-137 | Trifolium repens | White Clover | Grass or Forb species capable of accumulating radionuclides | [6] | ||
Cs-137 | H | Zea mays | Corn | High absorption rate. Accumulates radionuclides. [16] Contains 2 to 3 times more Cs137 in his roots than in the biomass above ground. [19] | [1] [6] [10] | |
Co | 1000 to 4304 [22] | Haumaniastrum robertii ( Lamiaceae ) | Copper flower | 27 records of plants; origin Africa. Vernacular name: 'copper flower'. This species' phanerogamme has the highest cobalt content. Its distribution could be governed by cobalt rather than copper. [22] | [10] [14] | |
Co | H- | Thlaspi caerulescens | Alpine pennycress | Cd(H), Cr(A), Cu(H), Mo, Ni(H), Pb(H), Zn(H) | Phytoextraction | [1] [4] [10] [12] [13] [14] [15] |
Pu-238 | Acer rubrum | Red maple | Cs-137, Sr-90 | Tree able to accumulate radionuclides | [6] | |
Pu-238 | Liquidambar styraciflua | American Sweet Gum | Cs-137, Sr-90 | Tree able to accumulate radionuclides | [6] | |
Pu-238 | Liriodendron tulipifera | Tulip tree | Cs-137, Sr-90 | Tree able to accumulate radionuclides | [6] | |
Ra | No reports found for accumulation | [10] | ||||
Sr | Acer rubrum | Red maple | Cs-137, Pu-238 | Tree able to accumulate radionuclides | [6] | |
Sr | Brassicaceae | Mustards, mustard flowers, crucifers or, cabbage family | Cd(H), Cs(H), Ni(H), Zn(H) | Phytoextraction | [4] | |
Sr | Beta vulgaris , Chenopodiaceae , Kail? and/or Salsola? | Beet, Quinoa, Russian thistle | Sr-90, Cs-137 | Can accumulate radionuclides | [6] | |
Sr | Eichhornia crassipes | Water Hyacinth | Cs-137, U-234, 235, 238. Also Cd(H), Cr(A), Cu(A), Hg(H), Pb, Zn(A) [1] and pesticides. [7] | In pH of 9, accumulates high concentrations of Sr-90 with approx. 80 to 90% of it in its roots [20] | [6] | |
Sr | Eucalyptus tereticornis | Forest redgum | Cs-137 | Tree able to accumulate radionuclides | [6] | |
Sr | H-? | Helianthus annuus | Sunflower | Accumulates radionuclides; [16] high absorption rate. Phytoextraction & rhizofiltration | [1] [4] [6] [10] | |
Sr | Liquidambar styraciflua | American Sweet Gum | Cs-137, Pu-238 | Tree able to accumulate radionuclides | [6] | |
Sr | Liriodendron tulipifera | Tulip tree | Cs-137, Pu-238 | Tree able to accumulate radionuclides | [6] | |
Sr | Lolium multiflorum | Italian Ryegrass | Cs | Mycorrhizae: accumulates much more Cs-137 and Sr-90 when grown in Sphagnum peat than in any other medium incl. clay, sand, silt and compost. [21] | [6] | |
Sr | 1.5-4.5 % in their shoots | Pinus radiata , Pinus ponderosa | Monterey Pine, Ponderosa pine | Petroleum hydrocarbons, organic solvents, MTBE, TCE and by-products; [4] Cs-137 | Phytocontainment. Accumulate 1.5-4.5 % of Sr-90 in their shoots. [20] | [6] |
Sr | Apiaceae (a.k.a. Umbelliferae) | Carrot or parsley family | Species most capable of accumulating radionuclides | [6] | ||
Sr | Fabaceae (a.k.a. Leguminosae) | Legume, pea, or bean family | Species most capable of accumulating radionuclides | [6] | ||
U | Amaranthus | Amaranth | Cd(A), Cr(A), Cu(H), Ni(H), Pb(H), Pb(P), Zn(H) | Citric acid chelating agent [8] and see note. Cs: maximum concentration is reached after 35 days of growth. [19] | [1] [6] | |
U | Brassica juncea , Brassica chinensis , Brassica narinosa | Cabbage family | Cd(A), Cr(A), Cu(H), Ni(H), Pb(H), Pb(P), Zn(H) | Citric acid chelating agent increases uptake 1000 times, [8] [23] and see note | [1] [4] [6] | |
U-234, 235, 238 | Eichhornia crassipes | Water Hyacinth | Cs-137, Sr-90. Also Cd(H), Cr(A), Cu(A), Hg(H), Pb, Zn(A), [1] and pesticides. [7] | [6] | ||
U-234, 235, 238 | 95% of U in 24 hours. [19] | Helianthus annuus | Sunflower | Accumulates radionuclides; [16] At a contaminated wastewater site in Ashtabula, Ohio, 4 wk-old splants can remove more than 95% of uranium in 24 hours. [19] Phytoextraction & rhizofiltration. | [1] [4] [6] [8] [10] URL | |
U | Juniperus | Juniper | Accumulates (radionuclides) U in his roots [20] | [6] | ||
U | Picea mariana | Black Spruce | Accumulates (radionuclides) U in his twigs [20] | [6] | ||
U | Quercus | Oak | Accumulates (radionuclides) U in his roots [20] | [6] | ||
U | Kail? and/or Salsola? | Russian thistle (tumble weed) | ||||
U | Salix viminalis | Common Osier | Ag, Cr, Hg, Se, petroleum hydrocarbons, organic solvents, MTBE, TCE and by-products; [4] Cd, Pb, Zn (S. viminalis); [8] potassium ferrocyanide (S. babylonica L.) [9] | Phytoextraction. Perchlorate (wetland halophytes) | [8] | |
U | Silene vulgaris (a.k.a. "Silene cucubalus) | Bladder campion | ||||
U | Zea mays | Maize | ||||
U | A-? | [10] | ||||
Radionuclides | Tradescantia bracteata | Spiderwort | Indicator for radionuclides: the stamens (normally blue or blue-purple) become pink when exposed to radionuclides | [6] | ||
Benzene | Chlorophytum comosum | spider plant | [24] | |||
Benzene | Ficus elastica | rubber fig, rubber bush, rubber tree, rubber plant, or Indian rubber bush | [24] | |||
Benzene | Kalanchoe blossfeldiana | Kalanchoe | seems to take benzene selectively over toluene. | [24] | ||
Benzene | Pelargonium x domesticum | Germanium | [24] | |||
BTEX | Phanerochaete chrysosporium | White rot fungus | DDT, Dieldrin, Endodulfan, Pentachloronitro-benzene, PCP | Phytostimulation | [4] | |
DDT | Phanerochaete chrysosporium | White rot fungus | BTEX, Dieldrin, Endodulfan, Pentachloronitro-benzene, PCP | Phytostimulation | [4] | |
Dieldrin | Phanerochaete chrysosporium | White rot fungus | DDT, BTEX, Endodulfan, Pentachloronitro-benzene, PCP | Phytostimulation | [4] | |
Endosulfan | Phanerochaete chrysosporium | White rot fungus | DDT, BTEX, Dieldrin, PCP, Pentachloronitro-benzène | Phytostimulation | [4] | |
Fluoranthene | Cyclotella caspia Cyclotella caspia | Approximate rate of biodegradation on 1st day: 35%; on 6th day: 85% (rate of physical degradation 5.86% only). | [25] | |||
Hydrocarbons | Cynodon dactylon (L.) Pers. | Bermuda grass | Mean petroleum hydrocarbons reduction of 68% after 1 year | [26] | ||
Hydrocarbons | Festuca arundinacea | Tall fescue | Mean petroleum hydrocarbons reduction of 62% after 1 year [8] | [27] | ||
Hydrocarbons | Pinus spp. | Pine spp. | Organic solvents, MTBE, TCE and by-products. [4] Also Cs-137, Sr-90 [6] | Phytocontainment. Tree able to accumulate radionuclides (P. ponderosa, P. radiata) [6] | [4] | |
Hydrocarbons | Salix spp. | Osier spp. | Ag, Cr, Hg, Se, organic solvents, MTBE, TCE and by-products; [4] Cd, Pb, U, Zn (S. viminalis); [8] Potassium ferrocyanide (S. babylonica L.) [9] | Phytoextraction. Perchlorate (wetland halophytes) | [4] | |
MTBE | Pinus spp. | Pine spp. | Petroleum hydrocarbons, Organic solvents, TCE and by-products. [4] Also Cs-137, Sr-90 (Pinus radiata, Pinus ponderosa) [6] | Phytocontainment. Tree able to accumulate radionuclides (P. ponderosa, P. radiata) [6] | [4] | |
MTBE | Salix spp. | Osier spp. | Ag, Cr, Hg, Se, petroleum hydrocarbons, organic solvents, TCE and by-products; [4] Cd, Pb, U, Zn (S. viminalis); [8] Potassium ferrocyanide (S. babylonica L.) [9] | Phytoextraction, phytocontainment. Perchlorate (wetland halophytes) | [4] | |
Organic solvents | Pinus spp. | Pine spp. | Petroleum hydrocarbons, MTBE, TCE and by-products. [4] Also Cs-137, Sr-90 (Pinus radiata, Pinus ponderosa) [6] | Phytocontainment. Tree able to accumulate radionuclides (P. ponderosa, P. radiata) [6] | [4] | |
Organic solvents | Salix spp. | Osier spp. | Ag, Cr, Hg, Se, petroleum hydrocarbons, MTBE, TCE and by-products; [4] Cd, Pb, U, Zn (S. viminalis); [8] Potassium ferrocyanide (S. babylonica L.) [9] | Phytoextraction. phytocontainment . Perchlorate (wetland halophytes) | [4] | |
Organic solvents | Pinus spp. | Pine spp. | Petroleum hydrocarbons, MTBE, TCE and by-products. [4] Also Cs-137, Sr-90 (Pinus radiata, Pinus ponderosa) [6] | Phytocontainment. Tree able to accumulate radionuclides (P. ponderosa, P. radiata) [6] | [4] | |
Organic solvents | Salix spp. | Osier spp. | Ag, Cr, Hg, Se, petroleum hydrocarbons, MTBE, TCE and by-products; [4] Cd, Pb, U, Zn (S. viminalis); [8] Potassium ferrocyanide (S. babylonica L.) [9] | Phytoextraction. phytocontainment . Perchlorate (wetland halophytes) | [4] | |
PCNB | Phanerochaete chrysosporium | White rot fungus | DDT, BTEX, Dieldrin, Endodulfan, PCP | Phytostimulation | [4] | |
Potassium ferrocyanide | 8.64% to 15.67% of initial mass | Salix babylonica L. | Weeping Willow | Ag, Cr, Hg, Se, petroleum hydrocarbons, organic solvents, MTBE, TCE and by-products (Salix spp.); [4] Cd, Pb, U, Zn (S. viminalis); [8] Potassium ferrocyanide (S. babylonica L.) [9] | Phytoextraction. Perchlorate (wetland halophytes). No ferrocyanide in air from plant transpiration. A large fraction of initial mass was metabolized during transport within the plant. [9] | [9] |
Potassium ferrocyanide | 8.64% to 15.67% of initial mass | Salix matsudana Koidz, Salix matsudana Koidz x Salix alba L. | Hankow Willow, Hybrid Willow | Ag, Cr, Hg, Se, petroleum hydrocarbons, organic solvents, MTBE, TCE and by-products (Salix spp.); [4] Cd, Pb, U, Zn (S. viminalis). [8] | No ferrocyanide in air from plant transpiration. | [9] |
PCB | Rosa spp. | Paul’s Scarlet Rose | Phytodegradation | [4] | ||
PCP | Phanerochaete chrysosporium | White rot fungus | DDT, BTEX, Dieldrin, Endodulfan, Pentachloronitro-benzène | Phytostimulation | [4] | |
TCE | Chlorophytum comosum | spider plant | Seems to lower the removal rates of benzene and methane. | [24] | ||
TCE and by-products | Pinus spp. | Pine spp. | Petroleum hydrocarbons, organic solvents, MTBE. [4] Also Cs-137, Sr-90 (Pinus radiata, Pinus ponderosa) [6] | Phytocontainment. Tree able to accumulate radionuclides (P. ponderosa, P. radiata) [6] | [4] | |
TCE and by-products | Salix spp. | Osier spp. | Ag, Cr, Hg, Se, petroleum hydrocarbons, organic solvents, MTBE; [4] Cd, Pb, U, Zn (S. viminalis); [8] Potassium ferrocyanide (S. babylonica L.) [9] | Phytoextraction, phytocontainment. Perchlorate (wetland halophytes) | [4] | |
Musa (genus) | Banana tree | Extra-dense root system, good for rhizofiltration. [28] | ||||
Cyperus papyrus | Papyrus | Extra-dense root system, good for rhizofiltration [28] | ||||
Taros | Extra-dense root system, good for rhizofiltration [28] | |||||
Brugmansia spp. | Angel's trumpet | Semi-anaerobic, good for rhizofiltration | [29] | |||
Caladium | Caladium | Semi-anaerobic and resistant, good for rhizofiltration [29] | ||||
Caltha palustris | Marsh marigold | Semi-anaerobic and resistant, good for rhizofiltration [29] | ||||
Iris pseudacorus | Yellow Flag, paleyellow iris | Semi-anaerobic and resistant, good for rhizofiltration [29] | ||||
Mentha aquatica | Water Mint | Semi-anaerobic and resistant, good for rhizofiltration [29] | ||||
Scirpus lacustris | Bulrush | Semi-anaerobic and resistant, good for rhizofiltration [29] | ||||
Typha latifolia | Broadleaf cattail | Semi-anaerobic and resistant, good for rhizofiltration [29] |
Caesium is a chemical element; it has symbol Cs and atomic number 55. It is a soft, silvery-golden alkali metal with a melting point of 28.5 °C, which makes it one of only five elemental metals that are liquid at or near room temperature. Caesium has physical and chemical properties similar to those of rubidium and potassium. It is pyrophoric and reacts with water even at −116 °C (−177 °F). It is the least electronegative stable element, with a value of 0.79 on the Pauling scale. It has only one stable isotope, caesium-133. Caesium is mined mostly from pollucite. Caesium-137, a fission product, is extracted from waste produced by nuclear reactors. It has the largest atomic radius of all elements whose radii have been measured or calculated, at about 260 picometres.
Bioremediation broadly refers to any process wherein a biological system, living or dead, is employed for removing environmental pollutants from air, water, soil, flue gasses, industrial effluents etc., in natural or artificial settings. The natural ability of organisms to adsorb, accumulate, and degrade common and emerging pollutants has attracted the use of biological resources in treatment of contaminated environment. In comparison to conventional physicochemical treatment methods bioremediation may offer advantages as it aims to be sustainable, eco-friendly, cheap, and scalable.
Nuclear fission products are the atomic fragments left after a large atomic nucleus undergoes nuclear fission. Typically, a large nucleus like that of uranium fissions by splitting into two smaller nuclei, along with a few neutrons, the release of heat energy, and gamma rays. The two smaller nuclei are the fission products..
Phytoremediation technologies use living plants to clean up soil, air and water contaminated with hazardous contaminants. It is defined as "the use of green plants and the associated microorganisms, along with proper soil amendments and agronomic techniques to either contain, remove or render toxic environmental contaminants harmless". The term is an amalgam of the Greek phyto (plant) and Latin remedium. Although attractive for its cost, phytoremediation has not been demonstrated to redress any significant environmental challenge to the extent that contaminated space has been reclaimed.
Salix viminalis, the basket willow, common osier or osier, is a species of willow native to Europe, Western Asia, and the Himalayas.
Mycoremediation is a form of bioremediation in which fungi-based remediation methods are used to decontaminate the environment. Fungi have been proven to be a cheap, effective and environmentally sound way for removing a wide array of contaminants from damaged environments or wastewater. These contaminants include heavy metals, organic pollutants, textile dyes, leather tanning chemicals and wastewater, petroleum fuels, polycyclic aromatic hydrocarbons, pharmaceuticals and personal care products, pesticides and herbicides in land, fresh water, and marine environments.
Caesium-137, cesium-137 (US), or radiocaesium, is a radioactive isotope of caesium that is formed as one of the more common fission products by the nuclear fission of uranium-235 and other fissionable isotopes in nuclear reactors and nuclear weapons. Trace quantities also originate from spontaneous fission of uranium-238. It is among the most problematic of the short-to-medium-lifetime fission products. Caesium-137 has a relatively low boiling point of 671 °C (1,240 °F) and easily becomes volatile when released suddenly at high temperature, as in the case of the Chernobyl nuclear accident and with atomic explosions, and can travel very long distances in the air. After being deposited onto the soil as radioactive fallout, it moves and spreads easily in the environment because of the high water solubility of caesium's most common chemical compounds, which are salts. Caesium-137 was discovered by Glenn T. Seaborg and Margaret Melhase.
A hyperaccumulator is a plant capable of growing in soil or water with high concentrations of metals, absorbing these metals through their roots, and concentrating extremely high levels of metals in their tissues. The metals are concentrated at levels that are toxic to closely related species not adapted to growing on the metalliferous soils. Compared to non-hyperaccumulating species, hyperaccumulator roots extract the metal from the soil at a higher rate, transfer it more quickly to their shoots, and store large amounts in leaves and roots. The ability to hyperaccumulate toxic metals compared to related species has been shown to be due to differential gene expression and regulation of the same genes in both plants.
Soil contamination, soil pollution, or land pollution as a part of land degradation is caused by the presence of xenobiotic (human-made) chemicals or other alteration in the natural soil environment. It is typically caused by industrial activity, agricultural chemicals or improper disposal of waste. The most common chemicals involved are petroleum hydrocarbons, polynuclear aromatic hydrocarbons, solvents, pesticides, lead, and other heavy metals. Contamination is correlated with the degree of industrialization and intensity of chemical substance. The concern over soil contamination stems primarily from health risks, from direct contact with the contaminated soil, vapour from the contaminants, or from secondary contamination of water supplies within and underlying the soil. Mapping of contaminated soil sites and the resulting clean ups are time-consuming and expensive tasks, and require expertise in geology, hydrology, chemistry, computer modelling, and GIS in Environmental Contamination, as well as an appreciation of the history of industrial chemistry.
The actinide series is a group of chemical elements with atomic numbers ranging from 89 to 102, including notable elements such as uranium and plutonium. The nuclides thorium-232, uranium-235, and uranium-238 occur primordially, while trace quantities of actinium, protactinium, neptunium, and plutonium exist as a result of radioactive decay and neutron capture of uranium. These elements are far more radioactive than the naturally occurring thorium and uranium, and thus have much shorter half-lives. Elements with atomic numbers greater than 94 do not exist naturally on Earth, and must be produced in a nuclear reactor. However, certain isotopes of elements up to californium still have practical applications which take advantage of their radioactive properties.
Environmental radioactivity is part of the overall background radiation and is produced by radioactive materials in the human environment. While some radioisotopes, such as strontium-90 (90Sr) and technetium-99 (99Tc), are only found on Earth as a result of human activity, and some, like potassium-40 (40K), are only present due to natural processes, a few isotopes, such as tritium (3H), result from both natural processes and human activities. The concentration and location of some natural isotopes, particularly uranium-238 (238U), can be affected by human activity, such as nuclear weapons testing, which caused a global fallout, with up to 2.4 million deaths by 2020.
This list covers known nickel hyperaccumulators, accumulators or plant species tolerant to nickel.
Rhizofiltration is a form of phytoremediation that involves filtering contaminated groundwater, surface water and wastewater through a mass of roots to remove toxic substances or excess nutrients.
Bassia scoparia is a large annual herb in the family Amaranthaceae native to Eurasia. It has been introduced to many parts of North America, where it is found in grassland, prairie, and desert shrub ecosystems. Its common names include summer cypress, mock-cypress, kochia, belvedere, World's Fair plant, burningbush, Mexican firebrush, and Mexican fireweed, the provenance of the latter three names being the herb's red autumn foliage.
Phytoextraction is a subprocess of phytoremediation in which plants remove dangerous elements or compounds from soil or water, most usually heavy metals, metals that have a high density and may be toxic to organisms even at relatively low concentrations. The heavy metals that plants extract are toxic to the plants as well, and the plants used for phytoextraction are known hyperaccumulators that sequester extremely large amounts of heavy metals in their tissues. Phytoextraction can also be performed by plants that uptake lower levels of pollutants, but due to their high growth rate and biomass production, may remove a considerable amount of contaminants from the soil.
Pycnandra acuminata is a species of plant in the family of Sapotaceae. It is a rainforest shrub, endemic to New Caledonia, and is adapted to the nickel-rich ultramafic soils found there. Pycnandra acuminata is notable as one of the most prolific hyperaccumulators of trace metals known, actively absorbing nickel from the soil and concentrating it within the plant to a concentration of up to 25% nickel citrate as dry weight of the sap, which is turquoise-green in colour due to the nickel content. It is the only known plant with turquoise sap. An excellent photo can be seen at. The vernacular name in French is sève bleue.
Bioremediation of radioactive waste or bioremediation of radionuclides is an application of bioremediation based on the use of biological agents bacteria, plants and fungi to catalyze chemical reactions that allow the decontamination of sites affected by radionuclides. These radioactive particles are by-products generated as a result of activities related to nuclear energy and constitute a pollution and a radiotoxicity problem due to its unstable nature of ionizing radiation emissions.
Mycorrhizal amelioration of heavy metals or pollutants is a process by which mycorrhizal fungi in a mutualistic relationship with plants can sequester toxic compounds from the environment, as a form of bioremediation.
Alyssum serpyllifolium, the thyme-leaved alison, is a species of flowering plant in the family Brassicaceae, native to the western Mediterranean region. It is adapted to serpentine soils. The Royal Horticultural Society recommends it for rock gardens.