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Inhibition of respiration and distribution of Cd, Pb, Hg, Ag and Cr species in a nitrifying sludge

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dc.contributor.authorSEMERCİ, NESLİHAN
dc.contributor.authorsCecen, Ferhan; Semerci, Neslihan; Geyik, Ayse Guel
dc.date.accessioned2022-03-12T17:47:48Z
dc.date.available2022-03-12T17:47:48Z
dc.date.issued2010
dc.description.abstractThe study investigated the inhibitory effects of the heavy metals Cd, Pb, Hg, Ag and Cr (as Cr3+ and Cr6+) on a nitrifying sludge. The aim was to assess the IC50 concentrations leading to 50% inhibition. The method is based on respiration of nitrifying sludge in the presence of these metals. Both O-2 consumption and CO2 production were taken into account. The order of the inhibitory effect was Ag > Hg > Cd > Cr3+ = Cr6+. Metal speciation was calculated in terms of free metal, inorganic metal complexes and bound metal. Pb largely precipitated and 50% inhibition was never reached. Ag was always in the form of the free ion or labile complexes. Hg had apparently a lower toxicity than Ag, since most of it was initially highly complexed with ammonia. Cd was present in the form of free ion and complexes which caused inhibition although a large part of them were precipitated. The inhibitory effects of trivalent chromium (Cr3+) and hexavalent chromium (Cr6+) were similar. The latter was present in the form of the anion CrO42- and was not taken up by biomass. The study highlighted that IC50 values alone do not have an explanatory power of inhibition unless speciation is also considered. (C) 2010 Elsevier B.V. All rights reserved.
dc.identifier.doi10.1016/j.jhazmat.2010.01.130
dc.identifier.eissn1873-3336
dc.identifier.issn0304-3894
dc.identifier.pubmed20172650
dc.identifier.urihttps://hdl.handle.net/11424/229838
dc.identifier.wosWOS:000278056300083
dc.language.isoeng
dc.publisherELSEVIER
dc.relation.ispartofJOURNAL OF HAZARDOUS MATERIALS
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectNonessential metal
dc.subjectNitrification
dc.subjectIC50
dc.subjectRespirometry
dc.subjectSpeciation
dc.subjectInhibition
dc.subjectWASTE-WATER
dc.subjectNITRIFICATION
dc.subjectREMOVAL
dc.subjectCHROMIUM(VI)
dc.subjectREDUCTION
dc.subjectMERCURY
dc.subjectMETALS
dc.titleInhibition of respiration and distribution of Cd, Pb, Hg, Ag and Cr species in a nitrifying sludge
dc.typearticle
dspace.entity.typePublication
local.avesis.id61073dc7-752b-4ce7-85c3-e6aa4ab6bd10
local.import.packageSS17
local.indexed.atWOS
local.indexed.atSCOPUS
local.journal.numberofpages9
oaire.citation.endPage627
oaire.citation.issue1-3
oaire.citation.startPage619
oaire.citation.titleJOURNAL OF HAZARDOUS MATERIALS
oaire.citation.volume178
relation.isAuthorOfPublication2b40c564-3821-44aa-b6e7-770e18c2e489
relation.isAuthorOfPublication.latestForDiscovery2b40c564-3821-44aa-b6e7-770e18c2e489

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