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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 Showing the Relationship between (A) the Tested Materials (biochar, VC, VCR and humin) and Various Cd2+ Concentrations (1 to 100 mg Cd2+ L-1, in blue) and (B) the Tested Materials (biochar, VC, VCR and Humin) and the Langmuir and Freundlich Isotherm Parameters (Qmax, b, Kf and n, in Blue).
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pone.0157547.g002: PCA Showing the Relationship between (A) the Tested Materials (biochar, VC, VCR and humin) and Various Cd2+ Concentrations (1 to 100 mg Cd2+ L-1, in blue) and (B) the Tested Materials (biochar, VC, VCR and Humin) and the Langmuir and Freundlich Isotherm Parameters (Qmax, b, Kf and n, in Blue).

Mentions: In the PCA, PC1 was observed to explain 99.9% of the total variance and showed that Cd2+ retention in the tested materials had a relationship with higher Cd2+ concentrations (Fig 2A). This result indicates that the differences in retained Cd2+ were more pronounced when the materials interacted with 50 and 100 mg L-1 Cd2+. The PCA for the adsorption isotherm parameters explained 91.31% of the total variance and showed a close relationship between the tested materials and n (PC1 63.12%) (Fig 2B), confirming favorable interactions between the materials and Cd2+.


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 Showing the Relationship between (A) the Tested Materials (biochar, VC, VCR and humin) and Various Cd2+ Concentrations (1 to 100 mg Cd2+ L-1, in blue) and (B) the Tested Materials (biochar, VC, VCR and Humin) and the Langmuir and Freundlich Isotherm Parameters (Qmax, b, Kf and n, in Blue).
© Copyright Policy
Related In: Results  -  Collection

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

pone.0157547.g002: PCA Showing the Relationship between (A) the Tested Materials (biochar, VC, VCR and humin) and Various Cd2+ Concentrations (1 to 100 mg Cd2+ L-1, in blue) and (B) the Tested Materials (biochar, VC, VCR and Humin) and the Langmuir and Freundlich Isotherm Parameters (Qmax, b, Kf and n, in Blue).
Mentions: In the PCA, PC1 was observed to explain 99.9% of the total variance and showed that Cd2+ retention in the tested materials had a relationship with higher Cd2+ concentrations (Fig 2A). This result indicates that the differences in retained Cd2+ were more pronounced when the materials interacted with 50 and 100 mg L-1 Cd2+. The PCA for the adsorption isotherm parameters explained 91.31% of the total variance and showed a close relationship between the tested materials and n (PC1 63.12%) (Fig 2B), confirming favorable interactions between the materials and Cd2+.

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