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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

Root and Leaf Dry Weights of Plants Grown on Different Substrates Containing Retained Cd2+ from the First Harvest until 28 Days after Seedling Transfer (DAT); on the x axis, 1st, 2nd, 3rd and 4th, respectively, indicate the first, second, third and fourth harvests from each experiment, conducted at seven-day intervals.Values are reported as averages ± the standard error (n = 30).
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pone.0157547.g008: Root and Leaf Dry Weights of Plants Grown on Different Substrates Containing Retained Cd2+ from the First Harvest until 28 Days after Seedling Transfer (DAT); on the x axis, 1st, 2nd, 3rd and 4th, respectively, indicate the first, second, third and fourth harvests from each experiment, conducted at seven-day intervals.Values are reported as averages ± the standard error (n = 30).

Mentions: Leaf and root biomass were also determined (Fig 8). A pronounced inhibitory effect on leaf and root biomass production was observed for plants grown with biochar and humin containing Cd2+, compared to the control and the other treatments. In contrast, plants grown with VC and VCR had similar root biomass as the control plants, and plants grown with VCR had higher leaf biomass than the control.


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)

Root and Leaf Dry Weights of Plants Grown on Different Substrates Containing Retained Cd2+ from the First Harvest until 28 Days after Seedling Transfer (DAT); on the x axis, 1st, 2nd, 3rd and 4th, respectively, indicate the first, second, third and fourth harvests from each experiment, conducted at seven-day intervals.Values are reported as averages ± the standard error (n = 30).
© Copyright Policy
Related In: Results  -  Collection

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

pone.0157547.g008: Root and Leaf Dry Weights of Plants Grown on Different Substrates Containing Retained Cd2+ from the First Harvest until 28 Days after Seedling Transfer (DAT); on the x axis, 1st, 2nd, 3rd and 4th, respectively, indicate the first, second, third and fourth harvests from each experiment, conducted at seven-day intervals.Values are reported as averages ± the standard error (n = 30).
Mentions: Leaf and root biomass were also determined (Fig 8). A pronounced inhibitory effect on leaf and root biomass production was observed for plants grown with biochar and humin containing Cd2+, compared to the control and the other treatments. In contrast, plants grown with VC and VCR had similar root biomass as the control plants, and plants grown with VCR had higher leaf biomass than the control.

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