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Assessment of the Use of Natural Materials for the Remediation of Cadmium Soil Contamination.

de O Pinto T, García AC, Guedes Jdo N, do A Sobrinho NM, Tavares OC, Berbara RL - PLoS ONE (2016)

Bottom Line: Our results show that under the conditions in this study, biochar and humin were not effective for soil remediation.These characteristics were especially notable for VCR, which was most effective for soil remediation.The results of our study demonstrate that in the tested materials, the bioavailability of Cd2+ to plants is related to their structural characteristics, which in turn determine their retention of Cd2+.

View Article: PubMed Central - PubMed

Affiliation: Soil Science Department, Federal Rural University of Rio de Janeiro (UFRRJ), Rodovia BR 465, Km 07, Seropédica-Rio de Janeiro, CEP, Brazil.

ABSTRACT
Rice plants accumulate cadmium (Cd2+) within the grain, increasing the danger of human exposure. Natural materials have been used in soil remediation, but few studies have examined the risks (based on the bioavailability of these metals to plants) of using these materials, so the practice remains controversial. In the present study, we evaluated the effectiveness of biochar produced from sugarcane bagasse, vermicompost (VC), vermicompost solid residue (VCR) and humin for remediation of Cd2+-contaminated soils. We characterized the interactions between these materials and Cd2+ and evaluated their capacity to alter Cd2+ availability to rice plants. Our results show that under the conditions in this study, biochar and humin were not effective for soil remediation. Although biochar had high Cd2+ retention, it was associated with high Cd2+ bioavailability and increased Cd2+ accumulation in rice plants. VC and VCR had high Cd2+ retention capacity as well as low Cd2+ availability to plants. These characteristics were especially notable for VCR, which was most effective for soil remediation. The results of our study demonstrate that in the tested materials, the bioavailability of Cd2+ to plants is related to their structural characteristics, which in turn determine their retention of Cd2+.

No MeSH data available.


Related in: MedlinePlus

PCA of FTIR Pure Spectra of Materials with and without Various Levels of Retained Cd2+.
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pone.0157547.g004: PCA of FTIR Pure Spectra of Materials with and without Various Levels of Retained Cd2+.

Mentions: PCA was also performed on the spectra of materials with and without retained Cd2+ (Fig 4). This experiment revealed changes in functional groups that were not evident from visual analysis of the FTIR spectra. Differences in functional groups were observed in all materials tested at the highest Cd2+ concentrations and without Cd2+ (Fig 4). These results confirmed the PCA results for the 13C-NMR data.


Assessment of the Use of Natural Materials for the Remediation of Cadmium Soil Contamination.

de O Pinto T, García AC, Guedes Jdo N, do A Sobrinho NM, Tavares OC, Berbara RL - PLoS ONE (2016)

PCA of FTIR Pure Spectra of Materials with and without Various Levels of Retained Cd2+.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4920433&req=5

pone.0157547.g004: PCA of FTIR Pure Spectra of Materials with and without Various Levels of Retained Cd2+.
Mentions: PCA was also performed on the spectra of materials with and without retained Cd2+ (Fig 4). This experiment revealed changes in functional groups that were not evident from visual analysis of the FTIR spectra. Differences in functional groups were observed in all materials tested at the highest Cd2+ concentrations and without Cd2+ (Fig 4). These results confirmed the PCA results for the 13C-NMR data.

Bottom Line: Our results show that under the conditions in this study, biochar and humin were not effective for soil remediation.These characteristics were especially notable for VCR, which was most effective for soil remediation.The results of our study demonstrate that in the tested materials, the bioavailability of Cd2+ to plants is related to their structural characteristics, which in turn determine their retention of Cd2+.

View Article: PubMed Central - PubMed

Affiliation: Soil Science Department, Federal Rural University of Rio de Janeiro (UFRRJ), Rodovia BR 465, Km 07, Seropédica-Rio de Janeiro, CEP, Brazil.

ABSTRACT
Rice plants accumulate cadmium (Cd2+) within the grain, increasing the danger of human exposure. Natural materials have been used in soil remediation, but few studies have examined the risks (based on the bioavailability of these metals to plants) of using these materials, so the practice remains controversial. In the present study, we evaluated the effectiveness of biochar produced from sugarcane bagasse, vermicompost (VC), vermicompost solid residue (VCR) and humin for remediation of Cd2+-contaminated soils. We characterized the interactions between these materials and Cd2+ and evaluated their capacity to alter Cd2+ availability to rice plants. Our results show that under the conditions in this study, biochar and humin were not effective for soil remediation. Although biochar had high Cd2+ retention, it was associated with high Cd2+ bioavailability and increased Cd2+ accumulation in rice plants. VC and VCR had high Cd2+ retention capacity as well as low Cd2+ availability to plants. These characteristics were especially notable for VCR, which was most effective for soil remediation. The results of our study demonstrate that in the tested materials, the bioavailability of Cd2+ to plants is related to their structural characteristics, which in turn determine their retention of Cd2+.

No MeSH data available.


Related in: MedlinePlus