Immobilization remediation of Cd-polluted soil with different water condition.

Abstract:

:To demonstrate effects of water management on soil Cd immobilization using palygorskite, the investigation evaluated impacts of palygorskite on uptake of Cd present in soils with different water condition by rice plant. Pot experiment results showed that, pH, available Fe and P in untreated soils were higher in continuous flooding than in traditional irrigation and wetting irrigation, which were reasons for lower soil exchangeable Cd and plant Cd in continuous flooding. In control group (untreated soils), compared to traditional irrigation, continuous flooding reduced brown rice Cd by 37.9%, that in wetting irrigation increased by 31.0%. At palygorskite concentrations of 5 g kg-1, 10 g kg-1 and 15 g kg-1, brown rice Cd reduced by 16.7%, 44.4% and 55.6% under continuous flooding, 13.8%, 34.5% and 44.8% under traditional irrigation, 13.1%, 36.8% and 47.3% under wetting irrigation (p < 0.05). At the same palygorskite addition, decreasing amplitude of brown rice Cd was higher in continuous flooding than in traditional irrigation and wetting irrigation. Competition for adsorption sites in root coating between Cd2+ and Fe2+ was another factor governing plant Cd. In control group, compared to traditional irrigation, root coating Fe(II) increased by 124.5% and root coating Cd reduced by 17.6% upon continuous flooding (p < 0.05). In conclusion, palygorskite addition combined with continuous flooding was an efficacious technique to stabilize Cd in paddy soils.

journal_name

J Environ Manage

authors

Li J,Xu Y

doi

10.1016/j.jenvman.2017.02.064

subject

Has Abstract

pub_date

2017-05-15 00:00:00

pages

607-612

eissn

0301-4797

issn

1095-8630

pii

S0301-4797(17)30182-2

journal_volume

193

pub_type

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