Abstract
Soils are a major sink for lead(Pb),which can be absorbed and bioaccumulated by plants and animals and eventually consumed by humans. Phytoremediation, the use of plants to remove or stabilize contaminants, is an inexpensive technique that can be applied to large areas for both remediation and the prevention of soil erosion. However, the low solubility of most lead compounds rarely results in Pb hyperaccumulation in plant. The use of chemical agents to increase metal desorption and solubility from soil has been a helpful tool to enhance metal uptake by plants. In this study, we investigated the potential of adding chitosan to Pb contaminated soils to increase Pb accumulation in corn. Cross-cut tests on corn absorb lead from soil are made on the base of four parameters: Pb concentration[total soil Pb 0.9, 1.2, 1.8g·kg-1],chitosan concentration[2.5, 5.0, 7.5mmol·kg-1],pH of chitosan solution[4.5, 5.5, 6.5],time[1, 4, 7 day]. The results indicated that within 7d after applying chitosan solution to the contaminated soil, the growth of corns was inhibited, even led to death. Chitosan was a natural macromolecular organism, it would caused soil harden, and corns would be poisoned by heavy Pb ion because of the complexation. The effectiveness was increased as Pb desorption from soil with chitosan adding; We also found that, at the best condition of Pb concentration[total soil Pb 1.8g·kg-1],chitosan concentration[5mmol·kg-1],pH of chitosan solution[4.5],time[7 day],chitosan significantly increased Pb translocation from roots to shoots, Pb concentration in the corn shoots increased 3-fold, and Pb concentration in the corn roots increased 1-fold as compared to the control group (no chitosan). Results from this study suggest that with appropriate design, chitosan-assisted Pb phytoextraction may provide a cost-effective soil decontamination strategy.
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Claims 8
Claim · model-written summary
Growth of corn was inhibited, and corn even died, within 7 days after chitosan solution was applied to Pb-contaminated soil.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“within 7d after applying chitosan solution to the contaminated soil, the growth of corns was inhibited”
t0“Corns(Zea mays L.)”
Claim · model-written summary
Corns would be poisoned by heavy Pb ion because of complexation with chitosan.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“corns would be poisoned by heavy Pb ion because of the complexation”
t0“Corns(Zea mays L.)”
Claim · model-written summary
Chitosan would cause soil hardening.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Chitosan was a natural macromolecular organism, it would caused soil harden”
t0“Corns(Zea mays L.)”
Claim · model-written summary
Pb desorption from soil increased as chitosan was added.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“The effectiveness was increased as Pb desorption from soil with chitosan adding”
t0“Corns(Zea mays L.)”
Claim · model-written summary
Chitosan significantly increased Pb translocation from roots to shoots of corn.
- Treatment
- chitosane5
- Outcome
- Pb translocation from roots to shootse5
- Direction
- increasede5
- Comparator
- control group (no chitosan)e6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“chitosan significantly increased Pb translocation from roots to shoots”
e6“as compared to the control group (no chitosan)”
t0“Corns(Zea mays L.)”
Claim · model-written summary
Pb concentration in corn shoots increased 3-fold with chitosan compared with the control.
- Organ / stage
- shootse7
- Treatment
- chitosane5
- Outcome
- Pb concentration in the corn shootse7
- Direction
- increasede7
- Value
- 3-folde7
- Comparator
- control group (no chitosan)e6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“Pb concentration in the corn shoots increased 3-fold”
e5“chitosan significantly increased Pb translocation from roots to shoots”
e6“as compared to the control group (no chitosan)”
t0“Corns(Zea mays L.)”
Claim · model-written summary
Pb concentration in corn roots increased 1-fold with chitosan compared with the control.
- Organ / stage
- rootse7
- Treatment
- chitosane5
- Outcome
- Pb concentration in the corn rootse7
- Direction
- increasede7
- Value
- 1-folde7
- Comparator
- control group (no chitosan)e6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“Pb concentration in the corn roots increased 1-fold”
e5“chitosan significantly increased Pb translocation from roots to shoots”
e6“as compared to the control group (no chitosan)”
t0“Corns(Zea mays L.)”
Claim · model-written summary
Chitosan-assisted Pb phytoextraction may provide a cost-effective soil decontamination strategy when designed appropriately.
- Outcome
- chitosan-assisted Pb phytoextractione7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“with appropriate design, chitosan-assisted Pb phytoextraction may provide a cost-effective soil decontamination strategy”
t0“Corns(Zea mays L.)”
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