ISSN:
1476-5535
Schlagwort(e):
Keywords: nickel; heavy metals; biosorption; pH; accumulation
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Biologie
,
Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
Notizen:
Accumulation of heavy metals by Pseudomonas fluorescens 4F39 was rapid and pH-dependent. The affinity series for bacterial accumulation of metal cations decreased in the order Ni〉〉Hg〉U〉〉As〉Cu〉Cd〉Co〉Cr〉Pb. Metal cations were grouped into those whose accumulation increased as the pH increased, with a maximum accumulation at the pH before precipitation (Ni, Cu, Pb, Cd, Co), and those whose maximum accumulation was not associated with precipitation (Cr, As, U, Hg). High Ni2+ accumulation was studied. Electron microscopy indicated that at pH 9, Ni2+ accumulated on the cell surface as needle and hexagon-like precipitates, whose crystalline structure was confirmed by electron diffraction analysis and corresponded to two different orientations of the nickel hydroxide crystals. Crystals on cells showed marked anisotropy by X-ray powder diffraction, which differentiated them from crystals observed in nickel solution at pH 10 and 11 and from commercial nickel hydroxide. Nickel biosorption by Pseudomonas fluorescens 4F39 was a microprecipitation consequence of an ion exchange. Journal of Industrial Microbiology & Biotechnology (2000) 24, 146–151.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1038/sj.jim.2900793
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