Direct determination of cadmium and beryllium in coal and fly ash slurries using graphite furnace atomic absorption spectrometry

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dc.contributor.advisorPougnet, M A Brunoen_ZA
dc.contributor.authorHaraldsen, Lana Celesteen_ZA
dc.date.accessioned2016-02-26T07:20:52Z
dc.date.available2016-02-26T07:20:52Z
dc.date.issued1990en_ZA
dc.descriptionBibliography: pages 119-126.en_ZA
dc.description.abstractGraphite Furnace Atomic Absorption Spectrometry (GFAAS) was used for the determination of cadmium and beryllium in coal and fly ash slurries. Sample preparation involved grinding the sample to a fine powder and slurrying it in a suitable solvent. Stable slurries were maintained by magnetic stirring during sampling. Pyrolytically coated graphite tubes were used for cadmium determinations, while beryllium was determined with platform atomisation. Ammonium dihydrogen orthophosphate and magnesium nitrate matrix modifiers were used for cadmium and beryllium determinations respectively. Calibration graphs constructed with aqueous standards containing the appropriate matrix modifier were rectilinear to at least 100 pg cadmium and 45 pg beryllium. Results were calculated with integrated peak area measurements. The detection limits were 2.9 pg for cadmium and 0.7pg for beryllium. Beryllium determinations were performed with semi-automatic sample introduction. The novel semi-automatic sampling unit utilised magnetic stirring for· the maintenance of stable slurries and operated with the standard Perkin-Elmer AS-40 autosampler. The principles of this unit were extended to the development of a fully automatic auto-sampling unit. The design and operation of both units are described. The accuracy of the methods was evaluated by analysing standard reference materials and in some cases, comparisons with acid digestion procedures. Data are presented for the analysis of South African coal and fly ash samples. The slurry methods had acceptable accuracy and precision. In comparison with the conventional acid digestion procedures using high pressure bombs, a time-saving advantage was realised.en_ZA
dc.identifier.apacitationHaraldsen, L. C. (1990). <i>Direct determination of cadmium and beryllium in coal and fly ash slurries using graphite furnace atomic absorption spectrometry</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Chemistry. Retrieved from http://hdl.handle.net/11427/17285en_ZA
dc.identifier.chicagocitationHaraldsen, Lana Celeste. <i>"Direct determination of cadmium and beryllium in coal and fly ash slurries using graphite furnace atomic absorption spectrometry."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Chemistry, 1990. http://hdl.handle.net/11427/17285en_ZA
dc.identifier.citationHaraldsen, L. 1990. Direct determination of cadmium and beryllium in coal and fly ash slurries using graphite furnace atomic absorption spectrometry. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Haraldsen, Lana Celeste AB - Graphite Furnace Atomic Absorption Spectrometry (GFAAS) was used for the determination of cadmium and beryllium in coal and fly ash slurries. Sample preparation involved grinding the sample to a fine powder and slurrying it in a suitable solvent. Stable slurries were maintained by magnetic stirring during sampling. Pyrolytically coated graphite tubes were used for cadmium determinations, while beryllium was determined with platform atomisation. Ammonium dihydrogen orthophosphate and magnesium nitrate matrix modifiers were used for cadmium and beryllium determinations respectively. Calibration graphs constructed with aqueous standards containing the appropriate matrix modifier were rectilinear to at least 100 pg cadmium and 45 pg beryllium. Results were calculated with integrated peak area measurements. The detection limits were 2.9 pg for cadmium and 0.7pg for beryllium. Beryllium determinations were performed with semi-automatic sample introduction. The novel semi-automatic sampling unit utilised magnetic stirring for· the maintenance of stable slurries and operated with the standard Perkin-Elmer AS-40 autosampler. The principles of this unit were extended to the development of a fully automatic auto-sampling unit. The design and operation of both units are described. The accuracy of the methods was evaluated by analysing standard reference materials and in some cases, comparisons with acid digestion procedures. Data are presented for the analysis of South African coal and fly ash samples. The slurry methods had acceptable accuracy and precision. In comparison with the conventional acid digestion procedures using high pressure bombs, a time-saving advantage was realised. DA - 1990 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1990 T1 - Direct determination of cadmium and beryllium in coal and fly ash slurries using graphite furnace atomic absorption spectrometry TI - Direct determination of cadmium and beryllium in coal and fly ash slurries using graphite furnace atomic absorption spectrometry UR - http://hdl.handle.net/11427/17285 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/17285
dc.identifier.vancouvercitationHaraldsen LC. Direct determination of cadmium and beryllium in coal and fly ash slurries using graphite furnace atomic absorption spectrometry. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Chemistry, 1990 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/17285en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Chemistryen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherChemistryen_ZA
dc.subject.otherFly ash - Analysisen_ZA
dc.subject.otherCoal ash - Analysisen_ZA
dc.titleDirect determination of cadmium and beryllium in coal and fly ash slurries using graphite furnace atomic absorption spectrometryen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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