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

 

Show simple item record

dc.contributor.advisor Pougnet, M A Bruno en_ZA
dc.contributor.author Haraldsen, Lana Celeste en_ZA
dc.date.accessioned 2016-02-26T07:20:52Z
dc.date.available 2016-02-26T07:20:52Z
dc.date.issued 1990 en_ZA
dc.identifier.citation Haraldsen, 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.uri http://hdl.handle.net/11427/17285
dc.description Bibliography: pages 119-126. en_ZA
dc.description.abstract 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. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Chemistry en_ZA
dc.subject.other Fly ash - Analysis en_ZA
dc.subject.other Coal ash - Analysis en_ZA
dc.title Direct determination of cadmium and beryllium in coal and fly ash slurries using graphite furnace atomic absorption spectrometry en_ZA
dc.type Master Thesis
uct.type.publication Research en_ZA
uct.type.resource Thesis en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Science en_ZA
dc.publisher.department Department of Chemistry en_ZA
dc.type.qualificationlevel Masters
dc.type.qualificationname MSc en_ZA
uct.type.filetype Text
uct.type.filetype Image
dc.identifier.apacitation Haraldsen, 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/11427/17285 en_ZA
dc.identifier.chicagocitation Haraldsen, 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/11427/17285 en_ZA
dc.identifier.vancouvercitation Haraldsen 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/11427/17285 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


Files in this item

This item appears in the following Collection(s)

Show simple item record