Inhibition of sewer crown isolates (Acidophilic thiobacilli) by transition metals

Persistent Link:
http://hdl.handle.net/10150/277061
Title:
Inhibition of sewer crown isolates (Acidophilic thiobacilli) by transition metals
Author:
Milner, Larry Fred, 1959-
Issue Date:
1989
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
Chemical inhibition of acid production by acidophilic thiobacilli was tested using a variety of metals and chelators (alone and in combination) including Hg(II), Ag(I), Co(II), Mo(VI), Cu(II), Zn(II), Cd(II), EDTA and NTA. When tested individually, Hg(II) and Ag(I) showed toxic effects at concentrations of 10-5 M and below; Cd(II), Zn(II) and NTA were noninhibitory at millimolar concentrations. Combination experiments showed both synergistic and antagonistic effects on chemical toxicities. Antagonism was apparent in experiments involving Cu(II)-EDTA, Cu(II)-Fe(III) and Cu(II)-Co(II). Synergism was apparent in experiments involving simultaneous addition of Mo(VI), Cu(II), Co(II) and Zn(II). In general, inhibitors either completely blocked or delayed the onset of acid production. In those cases where delayed reactions were observed, acid production began following an acclimation period on the order of days to weeks. Acclimation and metals speciation experiments suggest that adaptation events are due to biologically dependent changes in inhibitor speciation.
Type:
text; Thesis-Reproduction (electronic)
Keywords:
Thiobacillus.; Sewers, Concrete -- California -- Los Angeles County.; Concrete -- Corrosion.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Graduate College; Civil Engineering and Engineering Mechanics
Degree Grantor:
University of Arizona
Advisor:
Arnold, Robert G.

Full metadata record

DC FieldValue Language
dc.language.isoen_USen_US
dc.titleInhibition of sewer crown isolates (Acidophilic thiobacilli) by transition metalsen_US
dc.creatorMilner, Larry Fred, 1959-en_US
dc.contributor.authorMilner, Larry Fred, 1959-en_US
dc.date.issued1989en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractChemical inhibition of acid production by acidophilic thiobacilli was tested using a variety of metals and chelators (alone and in combination) including Hg(II), Ag(I), Co(II), Mo(VI), Cu(II), Zn(II), Cd(II), EDTA and NTA. When tested individually, Hg(II) and Ag(I) showed toxic effects at concentrations of 10-5 M and below; Cd(II), Zn(II) and NTA were noninhibitory at millimolar concentrations. Combination experiments showed both synergistic and antagonistic effects on chemical toxicities. Antagonism was apparent in experiments involving Cu(II)-EDTA, Cu(II)-Fe(III) and Cu(II)-Co(II). Synergism was apparent in experiments involving simultaneous addition of Mo(VI), Cu(II), Co(II) and Zn(II). In general, inhibitors either completely blocked or delayed the onset of acid production. In those cases where delayed reactions were observed, acid production began following an acclimation period on the order of days to weeks. Acclimation and metals speciation experiments suggest that adaptation events are due to biologically dependent changes in inhibitor speciation.en_US
dc.typetexten_US
dc.typeThesis-Reproduction (electronic)en_US
dc.subjectThiobacillus.en_US
dc.subjectSewers, Concrete -- California -- Los Angeles County.en_US
dc.subjectConcrete -- Corrosion.en_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.disciplineCivil Engineering and Engineering Mechanicsen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorArnold, Robert G.en_US
dc.identifier.proquest1337481en_US
dc.identifier.oclc21708350en_US
dc.identifier.bibrecord.b17300307en_US
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