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Speciation Of Cadmium And Changes In Bacterial Communities In Red Soil Following Application Of Cadmium-Polluted Compost

G. Chen, Y. Chen, G. Zeng, J. Zhang, Y. Chen, Liang Wang, Wenjuan Zhang
Published 2010 · Chemistry

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Abstract Lack of legal limits for heavy metal content in compost in China necessitates studying effects of heavy metal distribution on resulting toxicity to soil microbes, after the application of heavy metal–contaminated compost. A sequential extraction procedure was used to study the dynamic speciation of cadmium (Cd), and polymerase chain reaction–denaturing gradient gel electrophoresis (DGGE) analysis was applied to observe the changes in bacterial communities in red soil that were stressed by Cd-polluted compost. Results showed that the Cd fractions of exchangeable, carbonate, and Fe-Mn oxides increased (range: 0.88–10.12, 0.19–2.58, and 0.47–1.9 mg/kg, respectively), organic fraction of Cd decreased (0.05–0.34 mg/kg), and residual fraction of Cd did not regularly change with increased Cd content in compost during simultaneous incubation. DGGE profiles indicated that bacterial communities were affected by Cd-polluted compost to some extent. New bands emerged in the early incubation stage, and some ba...
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