Effects of age on toxicity to freshwater algae of water soluble extracts of No. 2 fuel oil

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dc.contributor.advisorWard, C. H.
dc.contributor.committeeMemberFisher, Frank M.
dc.contributor.committeeMemberTomson, Mason B.
dc.creatorHsieh, Ying-Ping
dc.date.accessioned2018-12-18T21:20:39Z
dc.date.available2018-12-18T21:20:39Z
dc.date.issued1979
dc.description.abstractThe effects of fresh-prepared, 4-day-aged and 8-dayaged Ho. 2 fuel oil water soluble fractions on the growth of Selenastrum capricornutum were investigated. The freshprepared water soluble fraction inhibits both the growth rate and cell yield of S. capricornutum. Its toxicity decreases after four days but there is still residual toxicity. This residual toxicity decreases very slowly; the effects of the 8day-aged water soluble fraction on S. capricornutum are comparable with those of the 4-day-aged one. The components of the water soluble fractions were identified by a mass spectrometer interfaced to a gas chromatograph. The major components are aromatic compounds, of which, the benzene and indene derivatives volatilize '.very quickly. Naphthalene and methyl naphthalenes volatilize in four days. However, the di-aromatic and tri-aromatic compounds, having boiling points higher than naphthalene,are still in the medium after 8 days. Sixteen component compounds were chosen for chemical analysis and toxicity testing. The concentrations of these compounds in the fresh-prepared , 4-day-aged and 8-day-aged water soluble fractions were determined, and their toxicities were investigated by "algal lavra" technique. The concentration distribution test on the agarized medium shows that the concentrations of naphthalene and phenanthrene are comparable at a selected distance after diffusing in the medium for four days. The results indicate that methyl, dimethyl and trimethyl naphthalenes are more toxic than naphthalene. The most toxic compounds are dibenzofuran, fluorene, phenanthrene and dibenzothiophene, v/hich have high boiling points.
dc.format.digitalOriginreformatted digital
dc.format.extent56 pp
dc.identifier.callnoThesis Biol. 1979 Hsieh
dc.identifier.citationHsieh, Ying-Ping. "Effects of age on toxicity to freshwater algae of water soluble extracts of No. 2 fuel oil." (1979) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/104303">https://hdl.handle.net/1911/104303</a>.
dc.identifier.digitalRICE1935
dc.identifier.urihttps://hdl.handle.net/1911/104303
dc.language.isoeng
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.
dc.titleEffects of age on toxicity to freshwater algae of water soluble extracts of No. 2 fuel oil
dc.typeThesis
dc.type.materialText
thesis.degree.departmentBiology
thesis.degree.disciplineNatural Sciences
thesis.degree.grantorRice University
thesis.degree.levelMasters
thesis.degree.nameMaster of Arts
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