Identification of the nickel uranyl phosphate deposits on citrobacter sp. cells by electron microscopy with electron probe X-ray microanalysis and by proton-induced X-ray emission analysis

Article Abstract:

Nickel uranyl phosphate deposition in Citorbacter sp. cells were found to be localized on the surface of cells as well as on the edge of the cells, thereby confirming the notion that microbially enhanced chemisorption of metals (MECHM) works throughout the immobilized cell matrix. X-ray microanalysis and X-ray emission analysis also reveals that deposits were also found in the area between cells that reveals that extracellular substances also play a part in MECHM.

Sewage Systems, Sewage Treatment Facilities, Sewerage systems, Pollution R&D NEC, Analysis, Usage, Sewer systems, Sewage, Identification and classification, Electron microscopy, Pollution control research, Nickel compounds

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Reduction of Cr(VI) to Cr(III) by wetland plants: potential for in situ heavy metal detoxification

Article Abstract:

Water hyacinth has been found to be an effective means of in situ detoxification of Cr(VI) contaminated wastestreams as the plant effectively converts Cr(VI) to Cr(III). X-ray spectroscopy results show that root and shoot tissues accumulated nontoxic Cr(III) with Cr(VI) reduction appearing to take place in the fine lateral roots. Water hyacinth is a potentially effective means of bioremediation as the whole plant can be harvested easily.

Waste Management and Remediation Services, Industrial Water Pollution, Environmental aspects, Chromium compounds, Water hyacinth

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Microbially-enhanced chemisorption of heavy metals: a method for the bioremediation of solutions containing long-lived isotopes of neptunium and plutonium

Article Abstract:

Microbially-enhanced chemisorption of heavy metals (MECHM) is an effective technique in the transuranic removal of elements such as neptunium and plutonium. Results reveal that exposure of solutions containing long-lived isotopes to lanthanum in the presence of organophosphate substrate to form cell-bound LaPO4 aids in the removal of transuranic radionuclides.

All Other Basic Inorganic Chemical Manufacturing, Industrial inorganic chemicals, not elsewhere classified, Plutonium, Lanthanum & Compounds, Lanthanum, Rare earth metal compounds, Transuranium elements

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