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Uptake and release of zinc by aquatic bryophytes (Fontinalis antipyretica L. ex. Hedw.)

2002Journal article Open access
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dc.contributor.authorMartins, Ramiro
dc.contributor.authorBoaventura, Rui
dc.date.accessioned2010-02-18T16:31:15Z
dc.date.available2010-02-18T16:31:15Z
dc.date.issued2002
dc.description.abstractThe zinc uptake and posterior release by an aquatic bryophyte—Fontinalis antipyretica L. Ex Hedw.—was experimentally studied in laboratory exposing the plants to different zinc concentrations in the range, 1.0–5.0 mg l 1, for a 144 h contamination period, and then exposed to metal-free water for a 120 h decontamination period. The experiments were carried out in perfectly mixed contactors at controlled illumination, using mosses picked out in February 1997, with a background initial zinc concentration of 263mg g 1 (dry wt.). A first-order mass transfer kinetic model was fitted to the experimental data to determine the uptake and release constants, k1 and k2; the zinc concentration in mosses at the end of the uptake period, Cmu; and at the equilibrium, for the contamination and decontamination stages, Cme and Cmr; respectively. A bioconcentration factor, BCF ¼ k1=k2 (zinc concentration in the plant, dry wt./zinc concentration in the water) was determined. A biological elimination factor defined as BEF ¼ 1 Cmr=Cmu was also calculated. BCF decreases from about 4500 to 2950 as Zn concentration in water increases from 1.05 to 3.80mg l 1. BEF is approximately constant and equal to 0.80. Comparing Zn and Cu accumulation by Fontinalis antipyretica, it was concluded that the uptake rate for Zn (145 h 1) is much lower than for Cu (628 h 1) and the amount retained by the plant decreased by a factor of about seven.pt
dc.identifier.citationMartins, Ramiro; Boaventura, Rui (2002). Uptake and release of zinc by aquatic bryophytes (Fontinalis antipyretica L. ex. Hedw.). Water Research. ISSN 0043-1354. 36:20 p.5005-5012pt
dc.identifier.doi10.1016/S0043-1354(02)00233-6
dc.identifier.issn0043-1354
dc.identifier.urihttp://hdl.handle.net/10198/2002
dc.language.isoengpt
dc.publisherElsevierpt
dc.subjectAquatic bryophytespt
dc.subjectMossespt
dc.subjectKineticspt
dc.subjectZincpt
dc.subjectFontinalis antipyreticapt
dc.titleUptake and release of zinc by aquatic bryophytes (Fontinalis antipyretica L. ex. Hedw.)pt
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage5012pt
oaire.citation.issue36(20)pt
oaire.citation.startPage5005pt
oaire.citation.titleWater Researchpt
person.familyNameMartins
person.givenNameRamiro
person.identifier.ciencia-idEA17-F39C-29C7
person.identifier.orcid0000-0003-4327-7782
rcaap.rightsopenAccesspt
rcaap.typearticlept
relation.isAuthorOfPublicationbf713e37-c17f-4a4e-8323-a7b770a038bf
relation.isAuthorOfPublication.latestForDiscoverybf713e37-c17f-4a4e-8323-a7b770a038bf

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