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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+.

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Cd2+ Adsorption Isotherms for the Tested Materials.From top to bottom: A) general adsorption isotherms, B) linear Langmuir isotherms and C) linear Freundlich isotherms. Retention values were determined through simple linear regression and were significant at p<0.05 (n = 15).
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pone.0157547.g001: Cd2+ Adsorption Isotherms for the Tested Materials.From top to bottom: A) general adsorption isotherms, B) linear Langmuir isotherms and C) linear Freundlich isotherms. Retention values were determined through simple linear regression and were significant at p<0.05 (n = 15).

Mentions: The four tested materials showed L-type adsorption isotherms, indicating Cd2+ interaction with the surface of the material until saturation of the available binding sites (Fig 1A) [39]. Linear Langmuir isotherms were the best-fitting isotherms for Cd2+ retention on biochar (R2 = 99.18, p<0.001), but these isotherms fit poorly for retention on VC (R2 = 30.80, p<0.001) (Fig 1B). Linear Freundlich isotherms were the best-fitting isotherms for Cd2+ retention on VCR (R2 = 95.51, p<0.001), humin (R2 = 94.32, p<0.001) and VC (R2 = 82.50, p<0.001) (Fig 1C).


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)

Cd2+ Adsorption Isotherms for the Tested Materials.From top to bottom: A) general adsorption isotherms, B) linear Langmuir isotherms and C) linear Freundlich isotherms. Retention values were determined through simple linear regression and were significant at p<0.05 (n = 15).
© Copyright Policy
Related In: Results  -  Collection

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

pone.0157547.g001: Cd2+ Adsorption Isotherms for the Tested Materials.From top to bottom: A) general adsorption isotherms, B) linear Langmuir isotherms and C) linear Freundlich isotherms. Retention values were determined through simple linear regression and were significant at p<0.05 (n = 15).
Mentions: The four tested materials showed L-type adsorption isotherms, indicating Cd2+ interaction with the surface of the material until saturation of the available binding sites (Fig 1A) [39]. Linear Langmuir isotherms were the best-fitting isotherms for Cd2+ retention on biochar (R2 = 99.18, p<0.001), but these isotherms fit poorly for retention on VC (R2 = 30.80, p<0.001) (Fig 1B). Linear Freundlich isotherms were the best-fitting isotherms for Cd2+ retention on VCR (R2 = 95.51, p<0.001), humin (R2 = 94.32, p<0.001) and VC (R2 = 82.50, p<0.001) (Fig 1C).

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