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The combined application of plant, microorganism, and amendment on the phytoremediation of heavy metals was optimized as a remediation technique for mine tailings by a field-scale orthogonal (L) experiment, aimed to achieve the maximum of phytoremediation effect. Soybean, M. Circinelloides, and A3 amendment (organic fertilizer: rice husk: biochar: ceramsite = 1:1:2:1) were recommended as the best plant, microorganism, and amendment materials, respectively. With the combined plant, microorganism, amendment application, effective fractions of Cu, Zn, Pb, Cd, Mn were immobilized for decreased bioavailability, indicating the phytostabilization served as a major repair pathway. Plant length and biomass in the treatments were significantly higher than that in the control, indicating their phytoremediation potentials were enhanced. The final contents of heavy metals in soil were decreased, and the removal rates of soil heavy metals were in the order of Pb＞Cd＞Cu＞Zn＞Mn. Temporal variations of soil microorganism populations indicated that the abundance of soil microorganism in the treatments was significantly higher than that in the control, and bacteria became the dominant microbial species. Results showed that the soil organic matter and catalase, urease, phosphatase activities of the treatments were all significantly higher than that of the control. This study provided optimized combined plant, microorganism, amendment materials in the enhanced phytoremediation field to make up the deficiencies of the long-term phytoremediation for heavy metals.
This article was published in the following journal.
Name: Ecotoxicology and environmental safety
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The technique of washing tissue specimens with a concentrated solution of a heavy metal salt and letting it dry. The specimen will be covered with a very thin layer of the metal salt, being excluded in areas where an adsorbed macromolecule is present. The macromolecules allow electrons from the beam of an electron microscope to pass much more readily than the heavy metal; thus, a reversed or negative image of the molecule is created.
Therapy of heavy metal poisoning using agents which sequester the metal from organs or tissues and bind it firmly within the ring structure of a new compound which can be eliminated from the body.
Conditions associated with damage or dysfunction of the nervous system caused by exposure to heavy metals, which may cause a variety of central, peripheral, or autonomic nervous system injuries.
A liquid resinous varnish solubilized in a volatile solvent which may be combined with a pigment. It forms a hard, glossy, and protective coating when applied to wood or metal.
A chelating agent used as an antidote to heavy metal poisoning.