Phytoremediation potential of Juncus subsecundus in soils contaminated with cadmium and polynuclear aromatic hydrocarbons (PAHs)

Int. J. Environ. Sci. Technol.

et al. 2013

The purpose of this study was to investigate the effect of phytoremediation on soils contaminated with heavy crude oil using plants infected by mycorrhizal fungi. Five plant species, Vetiveria zizanioides, Bidens pilosa, Chloris barbata, Eleusine indica, and Imperata cylindrica, infected with the species of mycorrhizal fungi Glomus mosseae, were selected for this study. The degradation of total petroleum hydrocarbons in soils and several physiological parameters of plants such as shoot length and biomass were analyzed. Out of the 5 plant species tested, only V. zizanioides, B. pilosa, and E. indica could take up the G. mosseae. Out of these three, V. zizanioides showed the greatest growth (biomass) in soils with 100,000 mg kg -1 total petroleum hydrocarbons. In addition, B. pilosa infected with G. mosseae was found to be able to increase degradation by 9 % under an initial total petroleum hydrocarbons concentration of 30,000 mg kg -1 in soils after 64 days. We conclude that plants infected with mycorrhizal fungi can enhance the phytoremediation efficiency of soils contaminated with high concentrations of heavy oil.

Section: Introductionmentioning

confidence: 99%

Phytoremediation of soil contaminated by heavy oil with plants colonized by mycorrhizal fungi

Kuo

Juang

Int. J. Environ. Sci. Technol.

et al. 2013

“…for Pb by citric acid. An interactive effect of heavy metals and organic pollutants on contaminants removal from cocontaminated soil can either cause a negative or positive effect depending on the type and concentration of both PAHs and metals (Zhang et al 2012). Cachada et al (2012) confirmed PAHs and PCBs, one group of semi-volatile, chemical stability and hydrophobic organic compounds which is everywhere in the environment, were associated with anthropogenic toxic elements such as Cu, Pb, Zn and Hg, especially between PAHs and Pb, with correlations higher than 0.767 (p \ 0.01), and this may explain why Pb and PYR could make each other desorbed from soils and utilized by plants more easily.…”

Section: Effects Of S Triqueter Res On the Fraction Distribution Andmentioning

confidence: 99%

Effects of key components of S. triqueter root exudates on fractions and bioavailability of pyrene–lead co-contaminated soils

Hou

Int. J. Environ. Sci. Technol.

Zhang

et al. 2016

The key components of S. triqueter root exudates involved 4-oxo-pentanoic acid, succinic acid, glutaric acid, phthalate acid, citric acid, vanillic acid, myristic acid, pentadecanoic acid, decanoic acid, 14-methyl-pentadecanoic acid, hexadecanoic acid, octadecanoic acid and oleic acid, and the content of the water-soluble organic acids (citric acid, succinic acid and glutaric acid) significantly increased in pyrene and lead co-contaminated rhizosphere soil. These three water-soluble organic acids including citric acid, succinic acid and glutaric acid were detected as the specific root exudates of S. triqueter under stress of pollutants for pyrene and lead, so they were chosen as the research objects, and they were added into the bioremediation systems of pyrene and lead co-contaminated wetland soils. Compared with the control, the treatments added the three organic acids always improved the quantity of the bioavailable fraction of pyrene and lead in wetland soils and greatly influenced other chemical states of pyrene and lead fractions in the test concentration range. Under the 50 g kg -1 of organic acids concentration, the amount of the bioavailable fraction of pyrene and lead increased 41.0 and 872.7 % by citric acid, respectively. The enhancement of bioavailability of pyrene and lead in the wetland soil by adding organic acids generally decreased in the following order: citric acid [ succinic acid [ glutaric acid. Enhancing effects of organic acids on the bioavailability improvement of pyrene and lead is remarkable.

“…In this study, the desorption amount of PYR slightly increased under high level of Pb (250 mg·kg −1 ), and the desorption amount of Pb was also increased under low level of PYR (50 mg·kg −1 ). Therefore, an interactive effect of heavy metals and organic pollutants on contaminants removal from co-contaminated soil can either cause a negative or positive effect depending on the type and concentration of both PAHs and metals (Zhang et al 2012). Cachada et al (2012) confirmed PAHs and polychlorinated biphenyls (PCBs) were associated with anthropogenic toxic elements such as Cu, Pb, Zn, and Hg, especially between PAHs and Pb, with correlations higher than 0.767 (p<0.01), and this may explain why Pb and PYR could make each other desorbed from soils and utilized by plants more easily.…”

Section: Organic Acids and Concentrationsmentioning

confidence: 99%

Identification of Scirpus triqueter root exudates and the effects of organic acids on desorption and bioavailability of pyrene and lead in co-contaminated wetland soils

Hou

Zhang

et al. 2015

Environ Sci Pollut Res

Root exudates (REs) of Scirpus triqueter were extracted from the rhizosphere soil in this study. The components in the REs were identified by GC-MS. Many organic acids, such as hexadecanoic acid, pentadecanoic acid, vanillic acid, octadecanoic acid, citric acid, succinic acid, glutaric acid, and so on, were found. Batch simulated experiments were conducted to evaluate the impacts of different organic acids, such as citric acid, artificial root exudates (ARE), succinic acid, and glutaric acid in REs of S. triqueter on desorption of pyrene (PYR) and lead (Pb) in co-contaminated wetland soils. The desorption amount of PYR and Pb increased with the rise in concentrations of organic acids in the range of 0-50 g·L(-1), within shaking time of 2-24 h. The desorption effects of PYR and Pb in soils with various organic acids treatments decreased in the following order: citric acid > ARE > succinic acid > glutaric acid. The desorption rate of PYR and Pb was higher in co-contaminated soil than in single pollution soil. The impacts of organic acids in REs of S. triqueter on bioavailability of PYR and Pb suggested that organic acids enhanced the bioavailability of PYR and Pb in wetland soil, and the bioavailability effects of organic acids generally followed the same order as that of desorption effects.