title: Myxococcus xanthus biomass as biosorbent for lead.
abstract: This paper deals with lead biosorption by Myxococcus xanthus biomass in which dry biomass, accumulating up to 1.28 mmol of lead g(-1), is demonstrated to be a more efficient biosorbent than wet biomass. Dry biomass biosorption was found to be very rapid, reaching equilibrium after 5-10 min. Culture age, the initial lead concentration and pH affected this process, but temperature did not. Furthermore, by using sodium citrate as a desorbent agent, 92.17% of the biosorbed lead could be recovered. It was also established that the biosorbed lead is located on the cellular wall and within the characteristic extracellular polysaccharide of this micro-organism.
authors.affiliation: Departamento de Microbiología, Facultad de Ciencias, Universidad de Granada, Granada, Spain.
authors.forename: M L
authors.initials: ML
authors.lastname: Merroun
authors.forename: N
authors.initials: N
authors.lastname: Ben Omar
authors.forename: M T
authors.initials: MT
authors.lastname: González-Muñoz
authors.forename: J M
authors.initials: JM
authors.lastname: Arias
mesh_terms: D000042:Absorption; D018533:Biomass; D001709:Biotechnology / Q000379:methods; D002473:Cell Wall / Q000378:metabolism; D002951:Citrates / Q000494:pharmacology; D006863:Hydrogen-Ion Concentration; D007854:Lead / Q000032:analysis / Q000378:metabolism*; D016941:Myxococcus xanthus / Q000378:metabolism*; D000077559:Sodium Citrate; D014874:Water Pollutants, Chemical / Q000378:metabolism*; D018508:Water Purification / Q000379:methods*
chemical_list: D002951:Citrates; D014874:Water Pollutants, Chemical; D000077559:Sodium Citrate; D007854:Lead